|Dave's Miscellaneous Stuff|
I will NOT be held responsible
for any info that is listed here
|****** N9EWO's ICOM "Chinese" HM-36 SIMPLE Hand Microphone Modification ******|
Newer Icom HM-36 hand
microphones are made in China (as indicated on the rear
of the mics case). Unlike the Japanese made versions
which are fine (marked Japan or unmarked) , these later
Chinese mics sound buzzy and have nasty excessive bass at
least when used with HF transceivers. From my contact
made with Icom America , it's the old story "we have
never heard of this" . Many hams around the internet
have covered this problem so this is not a one or two
After removing the 3 case screws and
separating the 2 parts, unplug the microphone from the PC
board (see photo below)
of the HM-36 Hand Microphone have serious issues with
½ inch WHITE cotton plug (or "gray foam" in
later production) that must be pulled out in front of the
********** N9EWO tries the KK5DR Icom PS-125 Fan Modification **********
|Matt KK5DR came up with a
great and very simple modification to the tame down the
noisy internal fan in the Icom PS-125 power supply. We tried it and I must say the fan
is much more quiet and no excessive heat either with my
phone ONLY operations. Not to say that it totally cures
the noise (it dosen't) , but now I can actually put up
with the PS-125 fan noise. Does not sound like a jet
airplane taking off anymore. As usual, TRY THIS AT
YOUR OWN RISK !! Click on the link above for more
information. Hardest part is to take it apart (properly)
!! Should work for the PS-126 as well (not tested) ?
Ten Tec RX-340 : Display
quirk noticed in 2005 sample / Sync detector continues to be a
With a "brand new" 2005 sample I checked out in the summer of 2005, a couple of notes. Note: I do not personally own a RX-340.
The main (larger) display had a nasty to my eyes that was not acceptable. Segments were not evenly lit. The main display is made for Ten-Tec in Korea by Samsung. Being almost a $ 4300.00 receiver , I feel that Ten Tec should be rejecting these when they look this bad (picture below that I took of the actual "test sample" display). There is simply no excuse for this. A sample that I used in the summer of 2001 had none of this and looked fine.
One other side note
is that the "Sync Detector" continues to be almost
worthless. It simply cannot hold lock, it keeps popping in and
out even on the strongest signals with no interference around. It
makes for a real aural treat when it's working, but more times
than not it does not cut it for my standards.
Try again Ten-Tec !
Even with the WJ8711A's sync only being double sideband, it sure holds lock much better over the RX-340 any day (in my view).
See my full RX-340 review here.
39.545 Mhz Display Repair
Download (N9EWO PDF) : Kenwood R-1000 "39.545 Mhz" Display Repair
After years of operation the Kenwood R-1000 can suffer a fixed 39.545 Mhz display and/or a dead radio/display (or it can just go wacky). First place is to check and re-solder solder joints at Q201 and Q203 on the small power supply / PLL board on the underside of the chassis. This is where connector # 12 is located. The two TO-220 devices mounted on the large heat sink and the PC board solder connections can work loose after many hot/cold cycles.
Just as important, be sure and touch up the solder joints involving connector # 12 and the four power rectifier diodes as well as these can cause for bad connections too. Especially so with pin one and two on connector # 12 as these are 5 volt pins closest to the heat sink. In extreme cases all electrolytic capacitors, Q201 and/or Q203 and/or the 4 power rectifiers may need to be replaced on this board. Beyond this, I cannot be of any additional help.