[bars] Icom IC-735

[Tony Brock-Fisher]

FWIW, I agree with Jim. Both the 735 and the 765 have a reputation for 
trimmer caps in the PLL going bad and needing replacement. The PLL is 
also affected by thermal conditions. IIRC there are several (four I 
think) different bands for the PLL, with one trimmer cap for each band. 
I did the trimmers in my 765 before I sold it - not an easy job.

-Tony, K1KP

On 7/4/2022 8:29 AM, Bruce Anderson wrote:
> Hello Jason
> I agree with Eric. 40 and 20 minute times indicated a large thermal 
> time constant. Nothing in the 735 has that mass. Power supply’s  do 
> (sometimes ) have thar mass.
> A735 needs about 17 amps at full power. What is your power supply 
> rated for ?
> Bruce
>
> Sent from my iPhone
>
>> On Jul 3, 2022, at 8:22 PM, Jim Idelson <jim at k1ir.com> wrote:
>>
>> 
>> This is typical of phase locked loop (PLL) not locking properly. I 
>> bet a Google search will turn up some articles and videos on the topic.
>>
>> 73 Jim K1IR
>>
>> On Sun, Jul 3, 2022, 9:02 AM Jason M. Sanroma - K1NAD 
>> <K1NAD at sanroma.net> wrote:
>>
>>     Hello,
>>
>>     I have an Icom IC-735. It was given to me by my grandfathers
>>     friend who happened to be the original owner of the radio. I
>>     noticed that after about 40 minutes of TX/RX 20m goes “dead”. The
>>     meter is 0 and does not move when I TX or just RX. It turns back
>>     on after about 20-40 minutes. There is also no background static
>>     while on RX.
>>
>>     It is obviously heat sensitive but I am not sure why and what
>>     is causing it. Does anyone have the same issue? Can anyone help
>>     me with an explanation of what it could possibly be?
>>
>>     Thanks for your help.
>>
>>     73,
>>     Jason
>>     K1NAD
>>     _______________________________________________
>>     bars mailing list
>>     bars at w1hh.org
>>     http://mail.w1hh.org/mailman/listinfo/bars_w1hh.org
>>
>> _______________________________________________
>> bars mailing list
>> bars at w1hh.org
>> http://mail.w1hh.org/mailman/listinfo/bars_w1hh.org
>
> _______________________________________________
> bars mailing list
> bars at w1hh.org
> http://mail.w1hh.org/mailman/listinfo/bars_w1hh.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.w1hh.org/pipermail/bars_w1hh.org/attachments/20220704/e7a30b28/attachment.htm>