[ICOM] IC736_OFF_FREQ

[Tim Moes]

George,

 An unstable Icom of that vintage is caused usually by bad trimmer 
capacitors in the Carrier or Ref Osc. The type of trimmers they used were of 
very poor quality and should be replaced with a ceramic type trimmer.

TNX... Tim  wd0fkc
----- Original Message ----- 
From: "George" <goofyham at highstream.net>
To: "Icom Mailman" <icom at mailman.qth.net>
Sent: Thursday, July 20, 2006 7:18 AM
Subject: [ICOM] IC736_OFF_FREQ


I have had this IC-736 for 7 years and it has been back to Icom twice some 
years back for off frequency operation. They said it is within specs! Try to 
tell the guys in my round table.
Anyway I have been through this rig numerous times trying to find the 
problem. I have even replaced all the components in the master osc and 
USB-LSB oscillators with no help. I have even added the temperature 
compensated oscillator, still no help.
It seems to be off 500 or so cycles.
I performed the frequency calibration as per the instruction manual and 
memorizing the change, again, per the manual. No help as it's back to the 
500 cycles off frequency on LSB after a few hours of non use, turned off.
I've replaced the backup battery, still no help. Don't know about USB as I 
don't use that mode often.
I have done all the field mods, no help.
Any suggestions????
Thanks.
George
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