Icom IC-R8600 "Wide Band" SDR / DSP
The excellent ICOM IC-R8600 "Wide Band" SDR
communications receiver. Direct Sampling SDR below 30 MHz. Hybrid Superhet / SDR above 30 MHz.
It is NOT just a IC-7300 "receiver" section with VHF / UHF Coverage
added on (however overall HF receiver performance is similar). In our
view the best receiver Icom has produced to date ("Wide Band" or not).
One MUST remember this is NOT a "scanner" type receiver, so no Trunking
etc. We detected some minor audio harshness / distortion and or spurious gremlins
with firmware 1.30 , 1.31 and 1.33 , but is cleaner with 1.32 to our ears (see text). 1.32 has extremely clean audio to us ! This was never an bug at all with
the IC-7300 Transceiver cousin, but it has much less dynamic (flat)
audio in comparison. One bug that still exists is what we call "AGC Swamping" (see text) (N9EWO Photo)
Icom IC-R8600 Wide Band SDR / DSP Communications Receiver (as Stock).
Comparisons made in this report to the Icom IC-R9000, IC-7300 HF SDR Transceiver and IC-R9500 Wide Band Receiver
(all tested and or owned previously).
Important Note : We will be looking at this receiver more on the "Short Wave" HF side of the fence below 30 MHz.
"Bug Reports" can be found at the bottom of this review.
Model : ICOM
Manufacture : Japan (Osaka)
Tested : 1.02, 1.10, 1.20, 1.30, 1.31, 1.32. 1.33 (1.32 for best audio quality in our testing, see text)
(approx.) of Test Sample : 0201xxx
Accessories Tested :
IR Remote : USA (discontinued / was not manufactured by Icom)
Software" (Versions 1.10, 1.20) [Made in Japan]
SP-39AD External Speaker / Power Supply (Made in Japan) [Contains AD-55NS, Made In China]
RS-12A Regulated Linear Power Supplies [Made in USA]
Various Die-Cast 2 Way Mini-Speakers (see text)
Test Antenna's :
Comet DS150S Discone Antenna (30 ft height)
RF Systems MLBA-MK2 long wire (55 ft length - 24 ft height at peak)
Comet H-422 Dipole (24 ft height - Straight Configuration)
Receiver Coverage / Internal Digital Voice Mode Decoding
The Icom IC-R8600 "Wide Band"
Communications Receiver coverage is from 10 kHz to 3000 MHz (less the
outdated cellular blocks for USA 02 versions ) in the usual AM, AM-S,
USB, LSB, CW, FM and FM Wide modes. However it also "internally"
decodes a number of digital protocols : Baudot RTTY, D-STAR, NXDN (4800 and 9600),
dPMR, DCR (Digital Communication Radio) and APCO P25 "Phase 1".
Woefully missing is the now widely used DMR (Digital Mobile Radio), and
being this not in Icom's game plan do not look for it to be included
either later on (ditto for Yaesu's Fusion C4FM). But there is a I/Q baseband
port provided for using external decoding devices.
Decoding DMR With Your Icom IC-R8600 ("You Tube" Video)
It uses the same identical RayStar 4.3 inch color TFT "touch screen"
display with super fast spectrum scope and waterfall display as with
the IC-7300 HF Transceiver. Some may say that that it is 100% IDENTICAL
to the IC-7300 for HF reception ? As we will cover in this report it
indeed is in many ways, but not entirely. There are many differences
other than just receiver coverage and is more suited for broadcasting
listening and also includes internal digital decoding for above 30 MHz.
What's The Draw To The IC-R8600 ? / Real Direct Sampling Up To 30 MHz
What are the pluses to the Icom IC-R8600 "Wide Band" receiver ? I
would say the first on the
list is it being a "Direct Sampling" Software Defined Receiver
design up to 30 MHz (just as with the IC-7300 HF Transceiver). That’s
right….no traditional mixer and IF stages in the HF coverage. Right
the antenna input there are 11 bandpass filters then to a 14 bit analog
to digital converter, after that there is a FPGA (Field Programmable
Gate Array). Above 30 MHz it does use a
traditional Super Heterodyne scheme and then down conversion into the
- Low distortion and hiss free audio (crisp and
SUPER CLEAN) with EXTENDED bass and treble adjustments for each
mode (firmware 1.32) .
- 4.3 inch color TFT "touch screen" display with super fast spectrum scope (up to 5 MHz swath) and waterfall display.
- Proper AM mode bandwidths for MW / SW Broadcast use, right up to a nice WIDE 10 kHz
one when conditions warrant.
- Icom's proper choices of tuning KNOB
steps and how selected.
- QUIET No Fan operation.
- Built in digital "off air" audio recorder with usable quality for MW
/ SW / FM Broadcast use (higher quality recording over IC-7300).
- Front mounted SD card slot (unlike the rear mounted and difficult to access CF card found in the IC-R9500).
- Just as it is for amateur
use, EXCELLENT super fast "Spectrum Scope" that can be tweaked for user preference (up to a 5 MHz total swath).
- LCD Backlight uses LED's for Greatly Improved Display Reliability (no CCFL tubes).
- Very good (optical encoder) tuning knob that is wobble
free and generally smooth operating (has Click or Smooth selection).
- Provided tilt bail for proper angle that also includes tabletop / anti-slide protection
(rubberish tube on bail and real rubber rear feet).
- No use of rubber like buttons (as
used with the Icom IC-7200, IC-718 Transceivers, IC-R8500 and IC-R75
- Rugged metal outer cabinet and Die-Cast chassis.
- High "Q" 11 RF Bandpass Filters on HF, 13 for VHF and UHF.
- TCXO included as standard (+- 0.5 PPM)
- Superb Phase Noise Characteristics.
- 3 Event Timer / 120 Minute Sleep Timer.
- Ethernet Operation for remote "World Wide" use / NTP Time Server Function.
- I/Q baseband signal output port (see text).
: Less relay "clicking-clacking" vs. the IC-7300 Transceiver. With no transmit electronics in
the IC-R8600 one will experience much less relay clicking as you tune
around. This has to do with the transmit low pass filters / relays (as it
has none). There
are still relay's used in the receiver mind you, but not many. On a
side note : No schematics or full block diagrams are included with the
Small Lightweight Cabinet /
Steel Outer Shell
Icom's IC-R8600 receiver is housed in an attractive steel outer
cabinet (plastic front bezel) with an internal thicker die cast chassis that also creates the
semi unpainted rear panel (1/2 is a sticker of some kind ?). When
compared to the IC-7300 HF transceiver (see my review here), it's tad
smaller and ever so slightly heavier. A very good pop-down tilt bail is
included and has a rubbery-plastic protection tube that saves the
desktop and helps to keep the lightweight box from sliding around in
use. There are also 2 bottom rear REAL RUBBER feet (not hard plastic)
to also aid with any sliding around issues.
Size comparisons (in inches Width x Height x Depth) :
IC-7300 : 9.45 x 3.7 x 9.37 / 9.26 pounds (4.2kg)
IC-R8600 : 8.7 x 3.5 x 9.1 / 9.50 pounds (4.3kg)
top of the cabinet there is it's small internal speaker output. It's
sounds decent for it's size. But of course only a external speaker will
satisfy most including me (more on that later in this report).
There is NO internal fan used of any kind in the IC-R8600.
This is of course very good news, but it does operate with a bit of heat
however, more so if one operates it at 13.8 volts (15 volts ??). Yes, it
does require use a external power supply and more on that topic later
knobs have a good feel and all buttons use traditional tac
switches. Buttons do have a slight wobble, but is nothing serious. No
undesirable soft plastic “rubber feeling” buttons are used. There are
3 mechanical "push in" rotary encoders used for many functions
including volume. These have a softer feel over the lone one found on
the IC-7300. There is
the typical slight rotational play with these, but is nothing
Main “metal” tuning knob is a bit smaller over the
IC-7300's but still has the rubber like track (and is actually a bit thicker). Not
sure at the time this report was typed if it's a “push on” variety knob
or uses a set screw ?? It's spinner hole is not a separate movable
piece (is just a dimple in the knob). Is a "clicky" type (detents) out
of the box. Good news , there is to way select a "smooth" feeling knob
by moving the 3 position slider adjustment on the bottom of the knob
(it's not so easy to do however). So it goes from left to right :
"smooth loose - smooth tight - clicky". It has some rotational play in
the "clicky" mode (but so does the IC-R9500's knob in "clicky " mode),
but overall it feels good and this knob scheme was well done.
only can the LED back light be dimmed (we use ours at 20%, default is
50%), the other LED panel indicators can be separately dimmed which is
a nice touch. The active SD card slot indicator is a blue LED just left
of the slot (with the IC-7300 indicator this is on the LCD). It flashes as
one accesses data to and from it. IMPORTANT NOTE : One MUST properly
"Dismount" the card just like with a computer (if the set is powered
The "P.LOCK" button disables the front panel controls including the
tuning knob (white LED when activated). Even better is if you hold this
button down for 1 second it will turn off (toggle) the backlight. Very
useful if you walk away from the set / room for awhile (without having
to power it off).
There are 3 antenna inputs.
- ANT 1 is a N Type Connector that covers all ranges.
- ANT 2 is a SO-239 for up to 30 MHz.
3 is a RCA (Phono) type jack that is a second input for up to 30 MHz.
All are selectable in programming so to make it easy if you are
using different antenna's. There is one rear RCA jack that is a "AUX" spare
(indicated in the manual that it is not connected to anything).
2 power inputs are provided. One is using the 3 pin molex type style
(is also used on the IC-R9500), and a nice flexible power cable is
included. The other is a EIAJ-5 Power Jack / Plug (4.3 x 6.5 x 9.5mm) type.
USA Icom dealer
"Universal Radio" stresses
these important "Operational Reminders" to IC-R8600 owners (especially for those
who DID NOT read the included printed manual).
Be sure to
insert the supplied "short connector" into the radio's rear panel if
using Icom's AD-55NS or SP-39AD.
accidentally try to insert a PL-259 connector into "Antenna Jack 1".
(This is an "N" jack).
Rear Panel of the Icom IC-R8600. "AUX" is a RCA (Phono) Jack that has no internal connection.
"Meter" Jack allows for connection of a external signal strength (usually mechanical type) meter.
Adjustment in the Menu's allow this up to 8 volts, output impedance 10K (not tested).
Requires External Power Supply / Operation "Near Hot" at 13.8 Volts
With the IC-R8600 rated a near 2 AMP current draw (it's actually approximately 1.4 amps continuous in our testing),
does make for very warm operation after a few hours on. It does NOT
make use of any
cooling fans...very good news here ! Any fans operating in a RECEIVER
is unacceptable to N9EWO. The IC-R8600 requires an external
power supply, and I REQUIRE my regulated linear power
supplies NOT to run HOT with any continuous operation. I would NEVER
use ANY switching type supply with it (as about 99.9% of them are RF
noisy in some way with a HF receiver no matter how well they are made),
but that's MY choice. I say the
minimum size to use is the Astron
RS-12A model. While this may seem way overkill, we tested a smaller
RS-7A and after being on for 2 hours (important : screen saver off so backlight on full time) it's lone rear pass transistor was too
hot to touch which is totally unacceptable to N9EWO's standards. The RS-12A
has 2 rear mounted pass transistors and a larger heatsink (and thankfully still
no fan to create room noise). We extensively tested / compared a RS-7A vs. the RS-12A with the IC-R8600 (both
at the stock 13.8 output voltage) and the RS-12A model is the PROPER
linear power supply for the IC-R8600. I say do NOT go with a lesser lower
current Astron model if you wish it to run to N9EWO heat standards ! It
operates the receiver for extended periods with the heat sink only
somewhat near hot (even at the changed 12.2 volts setting, see below).
I will NOT be held responsible for any info that is listed here
ALL DONE AT YOUR OWN RISK !
in our view the IC-R8600 runs quite warm almost near HOT after a 3 to 4
hours of operation (especially at the marked regulated 13.8 DC volts, screen saver off) ! VERY IMPORTANT
(PLEASE NOTE) : Test with SCREEN SAVER OFF , cabinet heat test based in a non-air conditioned room during
warm summer time conditions. Being in a cooler operating environment
cabinet heat will vary (be much less) !! NEVER block the cooling vents on
top of the set as indicated in the manual page 2-1 !! Give it room to
properly dissipate the generated heat. Our recommendation is DO NOT
stack ANYTHING on top of it (including another radio or even a clock).
We ran extensive
test to see if operation at a lower voltage would help to reduce
cabinet heat (for less internal voltage regulator burn off it has to do).
The voltage input specifications are regulated 13.8 DC volts plus or
minus 15%. That puts the low end at 11.73 volts, and sure enough as one
goes a bit below this voltage the receiver stops operating. I wanted to see
a .5 volts (half a volt) buffer above the low end specification , so we went with a setting of 12.2 volts
(adjustment made with the IC-R8600 on / as loaded to the host Astron RS-12A power supply).
Good news is that this does indeed help to reduce cabinet heat in our testing. Mind
you it will not make for cold operation, but we found this to help make
a definite noticeable difference even if only slight (and
can only help with the receivers longevity). We have not noticed any
performance as this text was added at the 12.2 volt
setting. Yes, it's even a bit hotter operation with the Icom AD-55NS or
SP-39AD with those being at 15 volts, see additional below. Most of the IC-R8600's heat is radiated from the LOWER right side of the chassis (with the front panel facing you).
Mind you this is still a much better showing with operational heat in any event when compared to the Icom IC-R9500 or IC-R9000 receivers with their quite "hot" operating internal power supplies (both tested previously).
NOTE and WARNING : The Astron RS-12A host power supply has an INTERNAL
voltage adjustment (between 11.0 and 15.0 volts). It's a thumb wheel
trimmer pot located on the parts side of it's PC Board and is not so
easy to get at. This one is for owners who have experience dealing with
this kind of stuff (and have a known "accurate" digital voltmeter). If you are not, PASS THIS UP and find a friend who is that can help you if you wish to do this !!
Recommended LINEAR (Transformer) Astron RS-12A Regulated Power Supply. Click on photo for larger view.
While it may seen overkill, continuous operation of the IC-R8600 made the lesser Astron RS-7A model to run too HOT !!
We turned down the operation voltage
of the RS-12A to 12.2 volts to help reduce the IC-R8600's cabinet heat
slightly (see text, photo)
The small piece of cardboard jammed in the RS-12A's top cover helped to reduce it's cabinet transformer buzz (a common trait). (N9EWO Photo)
Optional Matching "SP-39AD Power Supply - Speaker" / Why 15 Volts ??
We were able to test
a sample of the optional Icom SP-39AD External Speaker / Power Supply
combination. It is made in Japan and it contains inside a AD-55NS
switching type power supply (made in China). Please Note : The AD-55NS
"floor style" power
supply is also sold separately. All metal construction (except the
bezel) is solid and very attractive matching the IC-R8600
perfectly. Front speaker grill is also metal and excellent
Size is 3.9 (w) x 9.5 (d) x 3.5 (w) inches, weight is 3.5 pounds.
Has the same excellent rear "real" rubber feet as does the
IC-R8600 (using screws for
attachment, no undesirable stick on ones are used), chrome tilt bail
protection. So one will not have to worry about it sliding around the
table nor damaging it. It includes a detachable and very flexible "2
wire" 6 foot length AC power cable. It is not polarized so can be
inserted either way into the power outlet (117 VAC tested cable). Measured
"straight wired" DC output cable is
2.1 feet long and the speaker cable comes in at 5.5 feet long. Internal
speaker size is 2.5 inches large (this is the actual measurement done
and has a 5 watt rating.
OK, the BIG questions is : How much RF noise does the power supply
generate on Medium
Wave and Short Wave bands ?? Just as it is with most (if not all)
switching type power supplies, our testing of the SP-39AD (AD-55NS) we
indeed experienced LW / MW / SW RF noise interference (setting a
on top of it's case made it go really wacky). We used an active INDOOR MW and
Tropical Band Loop antenna's
(good for up to 7 MHz) in the same room
and close to the receiver. On the MW band we could
hear the supplies buzzy hash (touching the metal case of the speaker
actually made it a tad worse). But importantly the strength of this
power supply hash was "usually" lower than any received signal.
depended how close the loop antenna was to the SP-39AD case. Above 5
MHz using a passive 30 Foot INDOOR SW long wire across the ceiling of
the room, the noise was even less of a problem (but still detected).
Above approx. 30 MHz it was never much of a problem. If one uses all
antennas (at a decent distance from the receiver) this noise was not
much of an issue at all. By the way it made no difference what way the
AC Plug was inserted into the outlet.
So if you use a indoor loop (or a indoor long wire for SW) near
the SP-39AD just be sure and keep it as far as you can and should be no
problem in most cases. But one must remember your situation and
experiences may vary (as it goes with ANY indoor antenna use). It's not
the worst switching power supply we have encountered over the years
(again it's actually OK for MW / SW using outdoor antenna's). However in any event WE still choose to use a Linear
(Transformer) Regulated Power Supply set at 12.2 volts output as covered above to rule out ANY
noise issues 100% (but again that is MY choice).
Question we asked Icom America : "Why is the output of AD-55NS power
supply at an excessive 15 VDC ??" The receiver operation is just fine at
the cooler 12.2 volts (this is well within the + - 15% specifications
at the nominal 13.8 volts). At 15 volts it also operates the IC-R8600 even a tad
hotter than at 13.8 volts (as tested). As of this report being typed we
have not received any answer back on this topic.
As far as the internal 2 1/2
inch speaker fares in the SP-39AD, to our ears it did NOT sound as good
as the IC-R8600's internal speaker (even being it's pointed towards the
user). It was no where close. Lacks ANY bass response even at the
maximum + 15 Bass setting. This part of it was extremely poor in our
view for any broadcast listening (however it is acceptable for voice communication use).
Please see our speaker suggestions later in this report, that is
if you wish to obtain the best possible "Broadcast" speaker audio quality from the
receiver (the SP-39AD is not it).
If a Icom "external speaker" is a MUST HAVE for your IC-R8600, our suggestion is the larger SP-20 model (now sold as the SP-34 in a black cabinet).
It's the only Icom external speaker we have ever tested to date
decent to our ears. It's has a nice large 5 inch speaker, audio
filtering, dual inputs, neat Speaker "on-off" switch with LED and a 1/4
inch headphone jack to boot.
However it is quite pricey.
The SP-39AD is a very attractive matching speaker with a built in AC
power supply. It may or may not live up to your expectations (that is your
call and depends what type of signals you listen to).
Optional Matching SP-39AD "Switching" Power Supply / Speaker.
Frequency Coverage / Offered Modes
It contains a stand alone "floor wart" AD-55NS hidden inside.
Receiver Coverage: 10 kHz to 3000.000 MHz
(Minus 800 MHz cellular frequencies for “USA 02” blocked versions).
(in comparison the IC-R30 hand held receiver coverage is 100 kHz to 3304.999 MHz)
Available Modes (firmware 1.32):
- S-AM (D)
- S-AM (L)
- S-AM (U)
Digital Voice-Decoding Modes (firmware 1.32):
- APCO P25 (Phase 1)
- NXDN - N (Narrow - 9600 , 6.25 kHz)
- NXDN - VN (Very Narrow - 4800 , 3.125 kHz)
Just as with the Icom IC-R30 hand held receiver, it lacks DMR and Yaesu Fusion decoding. WFM mode is fully operational in the 902 to 928 MHz range.
Being this is a communications
receiver and not a scanner, Trunked Radio Systems (TRS) are NOT
followed. Provided a TRS system is not too busy and not using “Phase 2”
APCO P25, one can use the old trick and enter the frequencies in
memories as conventional and just leaving (or locking) out the control
channel. Also not allowing any channel delay. Not a perfect scenario
but at least usable.
Super Spectrum Scope Display / LED
Backlighting / Can See the Weaker Signals
"Spectrum Scope" Display that allows for viewing of a chunk of the HF
spectrum up to 5 MHz Max (+/- 2.5 MHz).
This is a huge improvement to
the older IC-756 PRO, PRO II and PRO III HF Transceiver models that
only did 200 kHz
max. Even the IC-7600 is limited to 500 kHz Max, the IC-7300 is 1 MHz
Max (+/- 500 kHz). The 1 MHz setting is the most useful "maximum" width
for use on HF. It matches the normal scope mode width (with no
muting) of the expensive Icom IC-R9500 super receiver for use above 30
MHz. Works better too
as it unearths the weakest of signals, where the IC-R9500 weak ones are
awash in it's noise floor "grass" (see my IC-R9500 review here). There are 3
different speed settings of the spectrum scope, but why anyone would
want to slow this down is a good question ?
it is only a 4.3 inch screen, it is a bit tight for what needs to
be displayed, but it gets the job done. We have an excellent
"Waterfall" screen as well, something completely absent on the elder
and very pricey IC-R9500. Why this was added to the IC-7600 HF
transceiver later and not to the IC-R9500 has always been a great
As is the normal for Icom here, the IC-R8600 spectrum scope still
for the 2 different types of tuning. One type where the center of the
tuned frequency moves with the dial and the other and way where the
scope stays fixed and you tune a red marker across the screen. The
desired tuned segments are adjusted in the menu's (very easy to do). Again we have to stress that the scope sensitivity
is excellent , plus with the bottom grass noise being totally absent
existed with older models (including the Icom IC-R9500).
One can change the colors of the display "scope" (personally I like
green), as well as the waterfall colors. Also a timed background
"ghost" display will indicate what have been received until you tune
again with the knob or when it resets (this can be turned off which we prefer to do). This
spectrum scope is active full time and no receiver muting at any time.
We changed to no-fill part of the spectrum display to make it look
more “old school” (to no fill at all). Please see below for a photo and the bottom of this page for adjustment details.
The IC-R8600 will not have a problem with CRT burn or CCFL “Florescent
Tube” backlight failures as it uses LED Backlighting. Its resolution is
also improved over the IC-7600 / IC-R9500 LCD's (even being a smaller size screen).
So it’s very sharp and extremely "W-I-D-E" viewable even being small.
Display Sizes and Resolution
IC-R8600 / IC-7300 : 4.3
RFE430H) 480 x 272
IC-7600 : 5.8
L5S30853P00) 400 x 240
Again, we found the sensitivity of the spectrum scope to be excellent as well.
I can see very weak signals on the scope (with no local
present…..and that is very important). Is the second (first was the IC-7300) Icom set with a
spectrum display I have been able to do this with. This is even
comparing to the very expensive IC-R9500 receiver (my review click here).
I’m sure some will
dispute this, but I have used many of Icom’s sets now with a spectrum
scope and this has been a treat here on the test
sample. I have my own desirable old school "Spectrum Scope" settings,
please see the bottom of this page for details. Please keep in mind
that I do NOT care
for waterfall display so much (but that is me of course), and that is
always still available in the EXPD screen even with my adjustments.
Touch Screen / Stylus - Screen Protectors "NOT"
OK, lets get it out of the way that I’m NOT a fan of touch screens
being used with a stand alone Receiver or Transceiver. Mind you I NEVER
touch a set with dirty hands / fingers. But even with that in mind, greasy and
fingerprint smearing is still going to be an issue anyway.
I also strongly do
NOT believe in any use of those stylus pens (popular for
tablets and smart phones - rubber tip or not) with the IC-R8600. That
constantly slamming against the LCD sure can't do it any good. I see
some using a pencil eraser......really (ouch) !! Your CLEAN fingers are
much softer than that.
LCD CLEANING NOTE : With the radio turned OFF, we CAREFULLY use a CLEAN screen cleaning cloth (made for LCD TV screens) MOISTENED WITH DISTILLED WATER (when it needs to be dealt with, which is not too often). NOT
dripping wet but not dry either, getting it totally wet and then squeeze out as much water as you can
from the cloth BEFORE. Using a very "light touch" is also the very
important word here. We just let it AIR DRY (which is not much) after with NO additional cloth usage to help to dry it. Of course if you do this "wrong" could lead to
water where you do not want it for LCD or other serious damage......"so you have been officially warned" !! NEVER NEVER NEVER....spray any liquids directly on to the LCD !!!
I will NOT be held responsible for any info that is listed here
ALL DONE AT YOUR OWN RISK !
Some have added a smart phone screen protector to prevent scratches and
other nastiness. But is this a good idea ? Five reasons why for ME it is
is going to cloud the screen a bit (I say….NO matter what the screen
protector manufacture hype is).
2. It's a
major chore to get it PROPERLY installed (good luck getting this
looking 100% decent).
3. Stress created on the LCD pressing this into place (and removing). Read
the warnings in your IC-R8600 owners manual.
4. Possibility it could make the touch sensitivity a bit less (or MUCH
less) ? As again covered in the owners manual.
5. Wear on it's "resistive type" touch screen is not going to make ANY difference if you have a screen protector on it or not.
So I choose NOT to make use of a screen protector and being I’m a very
picky-careful dude and again ALWAYS CLEAN hands / fingers….it has not been a problem for ME and part of the
reason why is next.
The Discontinued "R-75 SWL-Remotes" Black Box
To help with fewer pokes on the LCD touch screen we added a really cool
IR remote control device that allows basic operation of the Icom
IC-R8600 via a universal TV remote control. This “R75
was originally to be used with the Icom IC-R75 receiver but also works
with other newer Icom receivers / transceivers as well via the CI-V
"Remote" jack. Just connect the included CI-V cable between a very
small black control box and the transceiver. Next plug in the (also
included) very small ANALOG 9-volt wall wart 120 vac power supply into
the jack on the remote box. Program any universal remote control for a
Sony TV's and that is it after a few setting changes on the IC-R8600 (as
There are a few differences than used with the IC-7300.
For one direct keyboard entry is limited to 60 MHz (as the old IC-R75
receiver coverage was and the remote controller was originally made
for). These are NOT for the "Icom generic" model that "SWL Remotes"
also sold (although some will be valid). PLEASE NOTE : For the most
part (aside from toggling some receiver functions), it's really only
useful up to 60 MHz.
IMPORTANT : Sadly this
"R-75 SWL-Remotes" product has been discontinued and no longer available new.
One will have to hunt on the used market now and will not be easy as it
was not a widely sold product.
There is bit of a learning curve and not all functions are valid as the IC-R75 is a little different
This IR remote will NOT allow for any control of the spectrum scope
functions (among others). However most of the basic functions are
including, control the sets volume as well as muting it (one not even
available on the set), tune up and down the band or zip through your
memory channels. Adjust the bandwidths, AGC, PBT, Tuning Steps and even
for entering the memory channels and much more. Also you have direct
keyboard entry that is more straight forward and faster than on the
sets touch screen. Yes, this USA made product was a bit pricey when sold new.
NOTE : Do NOT confuse the proper R75 model with the more "generic
version" that is for older Icom models (example : volume or muting
control is not supported for the older sets with this generic model).
"SWL-Remotes" USA made after market device works great with the Icom IC-R8600.
Low cost SONY RM-EZ4 "Big Button"
remote works well with this device. You do not want a remote with lots
buttons or functions (it will make it much more confusing to use). The
Volume and Channel buttons are a bit on the stiff side and not the best
placement on the RM-EZ4, but it gets the job done nicely. Also good
that it uses 2 AA batteries for longer life (not the less desirable AAA
type) and a LED that comes on when a button is pressed. Any universal
remote will do the trick ,
just programed to work with Sony TV's. But the simpler the remote the
(sorry product now discontinued, this was NOT a Icom product)
NOTE : I no longer make use of
alkaline batteries due to the high
(likely in time) possibility of leakage. The use of the "low-self
discharge" type (or called pre-charged) AA rechargeable nickel-metal
hydride cells works fine with most IR remotes (including the Sony as
indicated above) and near eliminates this possibility of leakage. An
alternative would be the use of non-rechargeable AA Lithium batteries
(these have a much less chance of leakage over alkaline types as well).
Settings using the “R75 SWL-Remote” with the Icom IC-R8600 (Important : Using the
default settings in the remote device) :
1. Change the port "baud
rate" to 19200 in the IC-R8600 menu’s (don’t use auto).
2. Change the "address" to 5A (from the 94h default) also in the IC-R8600.
can be a bit finicky operation at first use; especially if you punch
the remote buttons a bit too fast and you get the blinking timeout
indication (this is a bit dependent on the remote model used). There
are timing settings on the remote that may help here, but I have not
attempted those as this report was typed. Not a real drawback
Ergonomics Good / Metering
with the Touch Screen nastiness and limited one touch operations in the mix, overall ergonomics are
good. But as it goes not as pleasant as if real buttons were in use (the IC-R9500 is better in this regard) .
direct keyboard entry is much easier to make happen using the IR remote as
covered above for the HF spectrum. One can select memory channels (once
a group is selected with the up down buttons) either the main tuning
knob or with "Dial C" knob.
As far as the NORMAL Mechanical Encode usage is (Sub Menu when pushed in) :
Dial A : SCAN DELAY / Sub Menu : SCAN SPEED and PRIO INTVL
Dial B : AF GAIN / Sub Menu : BASS, TREBLE, RF GAIN, SQL
Dial C : MEMORY CHANNELS / Sub Menu :
Varies with mode (normally Passband Tuning 1 / Passband Tuning 2 / VSC
/ Backlight setting).
Many of the Knob Sub Menu's can vary depending what mode you are in.
Metering is displayed using bar graphs and is selectable in the
following : Standard S-Units, dbu, dbu (emf) and dbm (same as with the
IC-R9500). Readings appear to be
There is a 1/8 inch phone jack on the rear panel to add a mechanical
meter (8 volts maximum), not tested. This output level (voltage)
can be tweaked in the menus.
Not so "Cool" operation / Contains No Cooling Fan
As commented earlier, in
our view the IC-R8600 runs quite warm almost near HOT after a 3 to 4
hours of operation (especially at the marked regulated 13.8 DC volts, screen saver off) ! VERY IMPORTANT (PLEASE NOTE) : Test with SCREEN SAVER OFF , cabinet heat test based in a non-air conditioned room during warm summer time conditions. Being in a cooler operating environment cabinet heat will vary (be much less) !!
NEVER block the cooling vents on top of the set as indicated in the
manual page 2-1 !! Give it room to properly dissipate the generated
heat. Our recommendation is DO NOT stack ANYTHING on top of it
(including another radio or even a clock). See the earlier comments on this page
to help reduce this slightly.
There is no cooling fan which is actually
extremely good news and no annoying buzz in operation. Having a fan
involved with a receiver (or in a transceiver in just receive mode) is
unacceptable to our standards.
One can just look at the actual tested
current measurements and
understand why the IC-R8600 operates VERY VERY warm to HOT (as compared
to the IC-7300 in receive which operates cold in comparison) !! The
real heat generator is the old IC-7600 HF Transceiver in just receive ONLY.
ICOM IC-R8600 at 12.2 or 13.8 volts, Firmware 1.20 (revised info via Rob Sherwood)
Receive Current :
1.3 Amps +/- 100ma
ICOM IC-7300 at 13.8 volts
Receive Current :
836 ma +/- 50ma
ICOM IC-7600 at 13.8 volts
Receive Current :
2.7 Amps +/- 50ma
Proper “Tuning Knob” Steps / Other
Tuning Knob Details / No 1 hz Tuning With Knob / VRIT
With most current production YAESU HF transceivers, the
“Tuning Knob” steps are extremely limited to just 10 or 100 hz steps in
SSB modes and 100 hz and 1 kHz in AM or FM modes. In the case of
the FT-450D this is even slower going (see my full
FT-450D review here for
those details). Yes…it can be a real “wrist wrecker” if you wish to
move fast using the main tuning knob.
it is with all current Icom HF receivers / transceivers, the IC-R8600
more programmable steps for the “Tuning Knob”. So one
can adjust it exactly proper to the owners desires for normal
operation, which for us is : 1 kHz for SSB, 5 kHz for SW Broadcast and
10 kHz for MW Broadcast
(or can be 9 kHz outside North America). Better yet, each mode stores
it’s own setting. Icom does this right here…no contest in our view.
Selecting a faster or slower temporary “tuning knob” step is a breeze
as it is with all current Icom HF sets.
Yes, it can tune and display
down to 1 Hz as well. However the ONLY way to access 1
hz tuning was with "direct entry" using the keyboard or by using the IR
Remote control (as cover earlier in this
report). Even the programmable TS setting will not allow 1 hz steps. In
sharp contrast the IC-7300 does allow 1 hz steps with the tuning knob (for 1 hz tuning steps the IC-7300 wins).
Tuning Knob optical encoder had a very good feel with no bearing slop
(downright zero). However it is not as silky smooth as the one found in
the vintage JRC NRD-545 receiver. Nor is our test sample as smooth as the IC-7300's encoder. Again (I know we already covered this, but have I been asked a number of times on this subject...so repeating) is a "clicky" type (detents) knob out
of the box. There is to way select a "smooth" feeling knob
by moving the 3 position slider adjustment on the bottom of the knob
(it's not so easy to do however). So it goes from left to right :
"smooth loose - smooth tight - clicky". It has some rotational play in
the "clicky" mode (but so does the IC-R9500's knob in "clicky " mode),
but overall it feels good and this knob scheme was well done.
There is a way to turn on a VRIT (Variable Rate Incremental Tuning)
with the tuning knob. Called "Manual Dial Auto TS". That is it speeds
up the tuning rate if the knob is spun fast by up to 5 times. This can
be most useful depending what tuning steps are normally used.
Proper Bandwidth Choices / SSB
Selections Could Be Wider / Useful S-AM modes (Is It a True AM Synchronous Detector ?) / Manual ECSS Excellent
The IC-R8600 is near excellent
when it comes to available bandwidths. For AM mode the user has
continuously variable bandwidths from 200 Hz to 10.0 kHz available (in
200 Hz steps). Of course we love the excellent 10.0 kHz one when
conditions warrant. For SSB modes its from 50 Hz to 500 Hz (50 Hz
steps) and 600 Hz to 3.6 kHz (100 Hz Steps). As usual for Icom with
current production models, the widest SSB is limited at 3.6 kHz. This
is a bit lacking especially for manual ECSS use. We would have like to
seen this to least 5 kHz (or even greater). Of course we have the
3-bandwidth presets that add to the excellent ergonomics as well.
At first test we were extremely disappointed that the S-AM modes (AM Synchronous Detector)
seemed be exactly the same
as in the IC-R9500 (Firmware 1.20). In other words, it did NOT help with AM mode fading
distortion. We have a bit better news on this after more testing. In
S-AM (D) [double sideband], it's indeed a royal stinker with no
reduction in fading distortion. When we switch to S-AM (U or L) [upper
or lower sideband], we are indeed hearing much less fading distortion.
Not that it does a stellar "yeoman's job" here as some distortion
remains and tends to cut off the high end slightly. But "finally" Icom has at least a useful Synchronous Detector
circuit to reduce most
fading distortion on the LW/ MW and SW bands. Of course one can use manual ECSS too (that is
zero beat in a SSB mode) which it does excellent with fading distortion totally gone. However the SSB modes
have limited top bandwidth of 3.6 kHz as all modern Icom sets do. We experienced none of the bugs that
plagued OUR IC-7600 test sample with manual ECSS use.
Important Note on the AM Synchronous Detector (Firmware 1.32) : Even with the Sync being useful, just by the way it acts it does NOT appear be a "TRUE" AM
Synchronous Detector being used ?? I say this as it never goes in a
usual "heterodyne" sound when in a out of lock condition like true Sync
will do when off tuned. The 'SYNC" light just flashes on and off with
no difference to the received signal. So its not all wine and roses
here, but at least you can set the bandwidth up to the maximum 10 kHz
value (unlike manual ECSS which is limited to 3.6 kHz).
Not only do we have a STOCK +/-
PPM TCXO for excellent
our test sample the display was also DEAD ON out of the box right down to the 1 hz digit (this can be
tweaked in the Menu’s if necessary).
Presets Changed From Default in kHz (Firmware 1.32)
WIDE (FIL 1) : 3.6
MID (FIL 2 ) : 2.8
NARROW (FIL 3) :
WIDE (FIL 1) : 10.0
MID (FIL 2) : 8.0
NARROW (FIL 3) :
As it has been with previous models, we also have the “DSP Filter
Shape” adjustment for SSB and CW modes. SHARP and SOFT. We normally
just leave it in the default SOFT selection for our operations (sounds
ADC Overloading / Sensitivity /
Other Receiver Notes / FMBC in Mono / "REF Level" UP to + 5.0 db
When the receiver is hit with an extremely excessive input signal, the
icon will start to flash. Unlike “dynamic range” mixer
overloading that can occur with an analog superhet receiver, here it’s
the ADC (Analog to Digital Converter) that gets saturated and can make
the FPGA to do strange things when the OVF indicator starts to flash.
In our testing (with firmware 1.32) and antennas it took the
receive PreAmp (Note : It only has one receive Preamp, not 2 as with
the IC-7300) with
a SUPER strong station for this OVF indicator to start
to flash (or a extremely noisy band and or with local interference).
Turning off the preamp's cured this overloading completely in
OUR situation when it happened. However this scenario will vary greatly
of course. In extreme cases it could take the attenuation function and
or backing off the RF Gain control to stop it.
TIP : What
might sound totally counterproductive, we operated the the preamp and
backed down the "RF Gain" to help recover audio with down in the noise
signals on HF.
Is this a drawback to
IC-R8600 ? I say….strongly NO. Being this is a true SDR, this is the
just part of the technology (at least at this price point).
does NOT have the "MW band ATT"
setting in the Menu's as with the IC-7300.
“IP Plus” function is advertised to improve the Intermodulation
Distortion (IMD). Optimizes the Analog/Digital Converter (ADC) against
the distortion when receiving a strong signal. Third-order Intercept
Point (IP3) is also supposed to be improved (this feature was not tested).
"side by side" testing the overall HF receiver performance and features
appear identical to the IC-7300 transceiver (PreAmp OFF). To equal the 7300's
"Spectrum Scope" sensitivity (Firmware 1.32) it was needed to adjust the "REF
Level" UP to + 5.0 db. Again the IC-R8600 only has one RX preamp,
where the IC-7300 has 2 (PreAmp 2 is rarely used except above around 15 MHz
for our antenna's).
See our IC-7300 page for more HF performance details (as those are indeed identical).
FMBC reception is stellar and
has excellent sensitivity and selectivity (only has one fixed bandwidth
in FM WIDE mode). It is in MONO only (sorry no Stereo). However it has
ACG pumping trait where at times the volume wonders a bit
intermittently. So the volume drops up and down at certain times (AGC getting swamped ?) Also
sounds like some audio compression is going on here in it’s DSP
processing (FM WIDE Mode ) ?? Of
course on the FMW mode the AGC and decay rate are
not adjustable. But even with this small bug, we can already tell you
that it's pointing to a fantastic FM DX'ers dream set. Selectivity and
sensitivity are both outstanding including stunning audio quality that
has never been heard out of communications receiver (well it's not all
wine and roses , we cover that later in this report). On the FMBC band
PreAmp use makes for a very noticeable improvement on very weak
VHF/UHF performance is another stellar showing of the IC-R8600.
Sensitivity and selectivity easily overtakes
any consumer "scanner" receiver (PreAmp ON). Of course one has to keep in mind
(again) that this is NOT a scanner and also cannot do any trunking
functions. Even with that, scanning speed is extremely zippy and
provided priority and scan delay features. For all FM modes there a
well performing (but small) discriminator meter that pops up on the mid
left screen. P25 decoding quality is simply first rate as is the NXDN digital decode mode also tested.
AGC / Weird AGC
Clipping Issue (Getting Swamped)
Three "preset" AGC settings are available (expect for Wide FM) :
Fast, Medium and Slow. The decay rates are adjustable for each
Generally the AGC works properly (Firmware 1.32). However when tuning across a very strong
broadcast station you have to sit and wait like up to 5 seconds to wait
for the AGC to come back down to continue tuning. Also when listening
to a weak station ANY static (including local interference) also
triggers this what we call "AGC swamping"
bug. Happens with any broadcast listening (MW , SW or even FMBC) and
yes the AM AGC setting is at the fastest-minimum you can go (so
on AM mode at .03s). Indeed, this is a bit annoying. Using the NB makes
no real difference when local interference causes this (slightly).
We changed the AGC SSB and AM
decay settings from the default as indicated below and
this SLIGHTLY helped to tame it (again to .03 s in the AM Mode FAST setting), but not by much.
This issue is actually even more noticeable with the IC-R8600 when
compared to the IC-7300 which also suffers a bit from this bug (as tested).
IC-R8600 AGC Decay Rate Changed From Default (Firmware 1.32)
To change the AGC setting (between
Fast, Med and Slow) you have to go into the "Function" Menu’s. No touch
available adjustment here. Another situation were the IR Remote Control
Clean Audio Quality With Firmware 1.32 / Tone
Controls / Internal Speaker / External Speaker Tests
General audio quality is EXCELLENT on
HF especially when manual ECSS or even the Sync Detector
is used (L or U.......NOT with D). Punchy with ZERO audio hiss and no DSP artifacts.
Even the virgin AM
mode is near
However it was not so great as out of the box (using the defaults). We
had to make a few setting changes to in the "Tone Control” settings to
make it sound proper (less muffled) and that information is below for
my ears (these increased tone control adjustments are a REQUIREMENT in
our opinion and of course will vary with other speakers used......experimenting is the word here).
While the internal speaker sounds OK to our ears, however for most only
decent external speaker will satisfy (more on that also below). See
earlier comments in this report for our views with Icom's matching
speakers with the IC-R8600.
The IC-R8600 has much more extended Tone controls over the IC-7300 (in fact it's a night and day difference). So
of course it has MUCH more richer sound especially with a decent external speaker in use. The IC-7300 sounds TOTALLY flat in
comparison (but is actually cleaner to our ears..see below).
our extensive testing we unearthed some minor audio harshness and or
spurious gremlins in the AM / FM or WFM modes (over HF and VHF/UHF and
FMBC receiving ranges) with firmware 1.01, 1.10, 1.30 , 1.31 and 1.33. But
with 1.20 and 1.32 was fine with no distortion (very interesting that was).
We were unable to determine
what was going on here as connected to all 3 of our test speakers (see
below) ? Many may have never
detected this gremlin ?
UPDATE : Good News....with Firmware 1.32 this audio harshness / distortion issue has been "totally" cleared up. I have to say the audio now is so clean and sharp it now matches (or extremely close) to the WJ-8711A super receiver
when properly adjusted and connected to the right 2 way speaker (more
on that next). This goes along way to help audio recovery with
extremely weak signals. Some may say that using a 2-way speaker on HF
is ridiculous, I say different. Sadly with 1.33 the audio distortion returned AGAIN !
Please make note that changing the tone control settings also changes the built in SD card audio recorder audio as
well (more below on that feature). We are unable to recommend
any SOLID "tone control" settings here, as that will vary greatly with the speaker used.
We ran extensive tests with 3 models "well cared for" classic mini "2 way die
cast speakers " with the Icom IC-R8600. The receiver's
internal 2 Watt audio amplifier drove all 3 more than adequately. All
of these speakers are discontinued and one will have to hunt on the used
ebay). WARNING : The Minimus 7 was made from 1978 to 1992 by various
contract manufactures for RadioShack (watch for degradation of the
surrounds on the woofers). Best to ONLY locate the latest C version that was
Malaysia (1992) and hopefully has not been abused by previous owners (and or modified) !!
In the case of ALL speakers we added 4 vinyl stick on feet (not
N9EWO's IC-R8600 Tone Control Settings (Realistic "Minimus 7" Speaker, Firmware 1.32)
(HF Bands, Broadcast 10 KHz Bandwidth)
Treble : + 3
Bass : + 11
(HF Bands, Amateur 3.6 KHz Bandwidth)
Treble : + 3
Bass : + 11
(FM Broadcast, Fixed Bandwidth):
Treble : + 4
Bass : + 12
The list of tested "Classic" Die-Cast speakers with the Icom IC-R8600 : (*- winner)
*- Realistic Minimus 7 . Cat 40-2030C [Date Code 6A2 (June 1992), made in
Malaysia. Near end of production). 4 inch woofer.
- Realistic Minimus 77. Cat 40-2054 [Date Code 9A1 (Sep 1991), made in
Korea. Last production was made in Malaysia in 1992) Larger 5 inch Woofer over
either 2 models.
- Centrios 4012000 Similar to the Realistic Minimus 7 in size and layout,
but sound has less Bass, made in China. It’s 4 inch woofer surround is foam instead of the
rubber one as in the Realistic 7’s. Was sold by “The Source” in Canada up to
around the early 2010’s.
The clear winner here was with the Realistic Minimus 7’s Cat
40-2030C. With the larger Minimus 77’s there was just too much bass
response even with the Bass control turned down. It also was not as
clean sounding. Centrios 4012000 clone was good too. Not as much bass
response (and different sound in general), but OK. Some have
said this speaker was an identical clone speaker of the Minimus 7, that
is simply is NOT TRUE in our side by side testing !
favorite speaker with the Icom IC-R8600 receiver is the classic
Realistic (Radio Shack) "Minimus 7" Die-Cast 2 way model (Catalog Number 40-2030C).
Look out hunting on the used market as age can eat away the woofer
rubber surround. Best to find a C version that was at the end of
production (Malaysia 1992). It was made between 1978 and 1992 by a
number of Radio Shack contractors / countries. The larger Minimus 77
model tested was excessively bassy even with reduced Bass adjustment on
the receiver. (N9EWO Photo)
SD Card Slot with Decent
“Off Air” Audio Recorder / Jamming In Slot / Line Output / Speech Synthesizer Notes
Icom’s super expensive IC-R9500 wide
band receiver features a built in audio digital recorder. There are a
multitude of quality settings; some are great while others at the
bottom are totally useless. In the case of the IC-R9500, it records to
the old standard “Compact Flash” card via a trap door located on the
REAR of the set. It's NOT easily accessible as you need a screwdriver
to it and a pair of needle nose pliers to remove it. You can read
my full IC-R9500 review here.
Well the IC-R8600 also has such a
feature too as does the IC-7300 HF transceiver. It records to it's
FRONT MOUNTED SD card, so much easier access. One can use up to a 32 GB
size card. It needs to be formatted (in the transceiver) before use.
This also adds a number of required folders on the card.
Of course this was an exciting part
of the receiver when we first discovered it. PLEASE NOTE : The IC-R8600's record quality is
improved over the recording rate found in the IC-7300 (it's not at the
same rate as you might think), so is a better sounding performer here. Still not
going to match using our outboard and discontinued
PCM-D50 PCM digital recorder via the rear mounted line audio output jack. The Sony of course does a better job but is more of a chore to use.
INTERNAL "WAV" RECORD FORMAT
/ IC-R30 INTERNAL "WAV" RECORD FORMAT
The single "lone" WAV format "selection" used
still limited at 16000 hz. It’s a excellent
feature to have in any event and could have been much worse as with the
old Icom IC-R20 receiver.
Allows for audio capture of something off air FAST
that may have not have been without it. We tested up to a near 2 hour
continuous file without
any problems (but not recommended...I say best to keep a file to 1 hour
maximum , start a new file). You can play it back in the receiver along with fast
forward / rewind feature. Or remove the card and easily transfer the
file to the computer for
playback or for conversion / archiving. It marks the recording with an
excellent date and time stamp (starting at the second).
We appreciate the use of a better
quality type SD card socket, that is it “clicks” into place and when
also removed. IMPORTANT NOTE : When removing a SD card and the
transceiver is on, one MUST “dismount” the card (located in the menus)
just like with a computer.
However one issue we had with the IC-7300 testing
(and we are not alone on this), was with a San Disk 32 GB SD card (SDSDUP-032G-T46) as it
jammed up in the slot. We could not click it back out. Some may say we
inserted it in crooked…no No NO…that is not the case. We were able to
get it out safely without any issues. When using other cards (we recommended San
Disk and Samsung brands)
this issue was not there. Have yet to
find out what was going on here (ever so slightly warped
card ??) NOTE
: We did not have this bug occur with the IC-R8600 at time of this
report (but others have, info via the IC-R8600's Yahoo Group). One also stores the user settings
/ memory channels and the screen capture pictures on the SD card.
Also available on the rear panel is a standard 1/8 inch phone socket for audio "Line Output". Level
is set at default 200mv (50%), and is
adjustable between 100 to 300mv's at 4.7K ohms impedance (in
CONNECTORS Menu > / AF Output Level). In our testing we found
this needed to be
turned up to around 80%
to work properly with other
external recorders (digital or analog). IMPORTANT NOTE : At 100% we
detected excessive distortion more so with SSB signals. Keep in mind
this also adjusts
the level going to the USB cable, so if ones uses this transceiver with
that function it's going to effect that as well. Again we must stress the Bass and Treble
controls DO effect the Line Audio output. This output can also be programmed "receive IF (12 kHz) signal output" (not tested).
note that the included excellent "Voice Synthesizer" (speech) feature
does stamp the recording (either using the built in audio
recorder OR via the Line Output jack). There are a couple different ways this can be selected onto the recording.
In the Set menu find : FUNCTION> SPEECH>SPEECH Output for Recording (see page 11-3 in the owners manual). Excellent !!
2000 Regular Memory Channels / CS-R8600 Programming Software
The IC-R8600 has 2000 regular memory channels in 100 groups (OK lets call then banks),
200 Auto Memory Write Channels, 100 Scan Skip Channels, 50 pairs of
Program scan edges. Of course that is many more over the IC-R8500 or IC-R9500. One can add a 10 characters alpha tag to
each entry including one for each group. Here the touch
screen makes for extremely easy entering of
the tags. However having the CS-R8600 Cloning Program is a very worthwhile
optional accessory even if priced a bit stiff (more on that next), we say it's a must have !!
USER TIP : The "M-CH DIAL" button is used to tune a "Memory" channel (for
those who do not read the owners manual, this will not be quickly obvious). With the White LED OFF
the MAIN dial tunes frequency (DIAL) and the DIAL C encoder will still
adjust the MEMORY CHANNEL. With the LED on, both tune the Memory
We tested the CS-R8600 optional "Cloning Software" with the
and is excellent. It's GUI is extremely well done and can even adjust
font size for not so great eyesight like the author. It has cut and
paste / insert / move an entry up and down. We actually found this
software to be one of the best we have EVER tested with any radio ! It
includes a Print function and that can be for all or just one Group. UPDATE :
However it's print function is not so great in our view as as it can't
print entire channel information on one page and waste paper to
unreasonable limits ! We used screen shots of the GUI "pre-print" screens (landscape output) and printed
the .jpeg's of the desired pages. This worked for our desires even if this was a chore to make happen.
N9EWO's CS-R8600 "Cloning Software"
Installation Tips (IMPORTANT NOTE : This is based for the original "version 1.0" of the software.)
#1 : Load the USB driver
(located on the CD-R) FIRST before one plugs any cables in.
Install the actual software (setup). It's takes a bit for it to
complete once it gets going (so be patient).
#3 : User needs to enter the
user name and serial number properly as indicated in the manual when
that screen appears (serial number is more than just the serial number
on the CD-R, product CD ID numbers come first). I left the "Company
Name " blank (optional).
#4 : BEFORE one plugs in the USB cable (cable
not included, I used the front mini-USB one), owner
MUST install the new 1.20 CS-R8600 software update (that
is if the owner did the 1.20 firmware or above update). If you pass
this step the program will NOT work (with firmware 1.20 or above installed) !!
#5 : With the USB cable connected, our host computer created interference on
the HF bands, so be sure and properly disconnect the cable once the
data has been transfered. Important Note :
Programming files with a older version (like 1.01 or 1.02) are NOT
compatible with a the latest 1.20 version. It may sort of work, but
weird things can happen I guess ?? So it is very important
for all CS-R8600 users to update to the latest 1.20 version and update
to the 1.20 (or above) IC-R8600 firmware before. Please Note : there are different firmware versions for USA and non-USA..
Noise Reduction /
Noise Blanker / Notch Filter
We found the Noise Reduction
(NR) feature on HF is not very useful (firmware 1.32). We found that
LEVEL 2 is as far one should
go, no higher otherwise it's awash with digital rubbish. Notch
filtering has auto and manual settings and par much better. To adjust
the manual notch (MN) the MULTI
knob is used. This takes a bit getting used to. But for most Notch use,
the Auto one works just fine (AN) even for broadcast use. Noise Blanker
is a mixed bag as they usually all are (depending on local conditions).
But it can be most useful and is fully adjustable to conditions (Level, Depth and Width).
Updates / Includes a FULL PRINTED manual
Firmware updates are accomplished via
the SD Card and could not get any easier. One process does all the
updates (Main CPU, Front CPU, DSP Program, DSP Data and the FPGA). This
is in sharp contrast to Yaesu’s way of going about Firmware updates
One of course needs to follow
instructions and understand them TOTALLY before it is attempted. When
one gets to the final screen: “Do You Wish To Start The Firmware
Update”, be sure and tap and HOLD on the YES icon for at least 1 second
otherwise it will not start it. This one is very easy to miss in the
manual (but it is indicated properly).
Speaking of the owner’s manual, there
is a FULL PRINTED one included (excellent). No CD-R manual is included (as with the IC-7300).
No Service Manual Available / Internal Pictures
As we type this, Icom has NOT provided ANY detailed block diagrams (let
alone schematics included with the receiver). Also as this text was
added , there is no service manual available for the IC-R8600. If you view the IC- R8600 Fenu Review (click here),
they provide a number of excellent internal photo's of the receiver.
Eric Cottrell removed the cover off of his IC-R8600 and had this
interesting observation with it's speaker and 4 unused mounting posts.
"I noticed they are using a ported speaker (see photo below). There is a hole
next to the speaker and a black plastic enclosure on the backside of the
speaker. There is also 4 mounting posts on the speaker panel. Maybe there
will be a future option board ? There are two populated unused connectors on the
main board. I also noticed a number of places for connectors that are not
IC-R8600's Internal Speaker uses a ported design (plastic baffle around the speaker).
There are 4 unused mounting posts on the speaker's bracket.
Who knows if down the road Icom will make use of these posts with a new option ? (Eric Cottrell Photo)
Real Time Clock.
IC-R8600 has an
excellent built in clock and is displayed in the upper right hand
corner of the
LCD. The chassis also contains a soldered in place ML414H
so it backs up the clock settings for a short
period (say during power failures). How long this backup battery
operates before it dies was not tested (1.0 mah capacity
rating). NOTE : If one leaves the receiver with no DC power connected
(even when OFF) , in a couple of days the internal clock will need to
Screen Saver. Can
be set for OFF, 15,
30 or 60 (default) minutes. We left this set at the default 60 minutes
and feel that should be used in normal operations. It totally shuts the
backlight off if the time elapses with no control or knob being touched
(has no moving display like with the IC-7600). When the screen saver is
in operation, the blue power LED flashes.
DRM 12 kHz output (not
tested). From page 16-1 in the manual : "You can change the Line Output" jack to IF, then transceiver outputs a 12 kHz IF
signal from this (and the USB). In that case, you can listen to the DRM broadcast
with the application software receiver that is installed into your
PC.". This of course this would be the free DREAM software.
is using the smaller
1/8 inch size. This is a plastic type jack being used here. Some I’m
sure will not prefer this size, but being it’s such a small footprint,
I don’t find it to be a drawback. The AOR AR7030
and Yaesu VR-5000
receivers both use the smaller 1/8 jack and work fine here.
more suited for modern headphones, which always use this size these
days anyway. It is a stereo type jack being used as well, so no
adapters are required.
Screen Capture Feature.
capture a LCD snapshot by tapping the POWER button. NOTE : This feature
turned on as default. File is saved to the SD card and as a BMP or PNG
type photo (selectable). See actual captured photo below.
2 USB Ports.
as it is with the
IC-7600 and IC-7300, there is a real USB port for direct computer
on the rear panel (audio and control). Not tested for this
review.There is also FRONT mounted Mini USB one as well. We
used this for the CS-R8600 software and worked just fine. As
usual, it requires
installation of a driver before use (uses 2 COM ports).
SDR I/Q output. With 1.30 firmware and above allows I/Q output from it’s rear
jack. Separate program for the host computer is also required. Works with the
HDSDR program. Also the RC-28 "knob" can be also used with the HDSDR program as well on the host
computer (I/Q output was not tested). Tip : Use a high quality USB cable and no longer than 6 feet (2m) to host computer.
Best Icom Receiver Ever as Tested To Date - "Wide Band" or Not (as this report was typed)
We have not been able to test the IC-R8600 up against the super big modern HF
transceivers (Icom IC-7851, Kenwood TS-990 or any Flex /
Elecraft etc.). We have no budget for that and never will. As a
"Wide Band" or as HF receiver I
would rate the Icom IC-R8600 well above the super expensive IC-R9500 for
display performance. Even beats out all other HF Icom receivers of the
past in our view (I have experienced them all). For the price
it's overall performance is just stellar in our testing aside from the
LCD touch screen madness that I just don't care for. Some will say it's
identical to the IC-7300 transceiver (minis the transmit). Well for
overall receiver performance
it most certainly is, but as we covered above it definitely is NOT
We found that using Firmware version 1.32 was the best for
audio quality (Zero harshness / distortion), and actually is the best
"communications receiver" EVER tested for pleasant and supreme recovery audio quality in our view. However the AGC
"swamp" bug is
nasty and is a
even bit worse over the IC-7300 transceiver (see our review here) . We can hope for a fix down the road on this (and most importantly not affecting the excellent audio quality).
© N9EWO, all rights reserved
IC-R8600's "Screen Capture" feature at work and also shows
our change to "no-fill" part of the spectrum display to make it look
more “old school” (to no fill at all and a green line). When "Screen Capture" switched on in the menu's (default is off), a TAP of the POWER
button saves the
currently viewed screen to a PNG or BMP file (also selectable in the
onto the SD card. Works well however some parts are on the fuzzy side.
Even as we were in the record mode the screen capture worked at the
same time without a hitch. In this screen capture it is showing the maximum size
one can view the "Spectrum Scope" using the EXPD (Expanded Screen).
This takes an adjustment in the Spectrum SCOPE SET Menu >Waterfall Size (Expand Screen) (page 4/5) to Small
(default is Mid). Sorry, there is no way to totally turn off the
waterfall in the EXPD screen (Firmware 1.32). For more information
on our "Spectrum Scope" changes please see the chart on the bottom of this page. (N9EWO Photo)
****** ICOM IC-R8600 BUG REPORTS ****** (subject to change/deleted without notice)
If you experience any of these or a new one please let us know , be sure to include what firmware version you are using !!
(and please also report to Icom with as many details / all settings of the receiver as you can).
PLEASE NOTE : Bug Reports Listed Below are with the Later Firmware 1.32 and 1.33 ONLY
- Fernando from Fenu Radio
reports a bug with firmware v1.32. (NOTE : This is with a late production sample)
"Noise Reduction (NR) works awful. Over the # 2 setting it produces
many digital artifacts. Specially in AM Mode the NR you just cannot use
UPDATE : After
more investigation on this, Fernando is indeed correct. The NR mode is
pretty much useless from about 3 and up. I think it was better with
older versions, but was never as useful as the NR in the IC-7300.
- Audio harshness returned with firmware v1.33 to our ears (July 31, 2018).
Links for Additional IC-R8600 Information (All Subject To
Change Without Notice)
Icom America IC-R8600 page
ENGLISH PDF Brochure
ENGLISH PDF Manual
- Fenu Radio English Review (includes internal pictures)
- eham Reviews - Icom America Repair
- eham Reviews - Icom Service Center Michigan
- Review November 2017 QST (PDF via Icom America's web site)
- eham Reviews
- Sherwood Engineering "Receiver Test Data"
IC-R8600 "You Tube" Video's
that we feel are worth the link below :
- Decoding DMR With Your Icom IC-R8600
- Introduction of Its Operation (including the Sync Detector)
JRC NRD-545 Part II
- MW Band in Japan
- Radio Sakha 7345kHz
(using Sync Detection)
- Medium Wave Reception in Japan
- FM Reception in Japan
- Performance of the Synchronous Detector
- Operation of Filter Adjustment
- 9875kHz VORW Radio International (with S-AM(U) on)
- First Impressions in Europe by Fenu-Radio
Operation of Synchronous Detector and TWIN PBT
- SDR DDC приемник
- General Video
- Fenu Radio Showing the RS-R8600 in operation
N9EWO ICOM IC-R8600 "SPECTRUM SCOPE"
(using Steve Ellington N4LQ
IC-7300 data as a base, but is not exact)
IMPROVED “NO-FILL” SPECTRUM
SCOPE - WATERFALL CHANGES
Scope" Settings Menu : (press and
hold on touch screen) " EXPD / SET "
(change settings as below ,
all others are left at default)
Important Note: Be sure that the “VBW” (page 2/4) is
selected on NARROW also located in the “scope set” menu (Default is “Narrow”).
* - This will
allow for the largest viewable “Spectrum Scope” (when in “Expand Screen”)
** NEW SETTING **
CENTER Type Display
Carrier Point Center
FILL + LINE
Waveform Color (Current)
R : 172
G : 191
B : 191
R : 0
G : 0
B : 0
Waveform Color (Line)
R : 56
G : 24
B : 0
R : 0
G : 255
B : 0
Waterfall Size (Expand
Waterfall Peak Color Level
Tip : To equal the IC-7300 transceiver “Spectrum Scope” sensitivity with the test sample
(tested at 30 MHz and below), the “REF Level” was increased to + 5.0 dB (firmware 1.32).
Icom IC-7610 Fan Operates in just "Receive Only" Use !
The Icom IC-7610 "Direct Sampling" SDR HF Transceiver's receiver section draws around "3+ amps" of current just as with the
elder IC-7600 model did (via information as indicated
in the brochure). We of course had a gut feeling that the fan
would operate in just RECEIVE use ??
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