I am looking a the schematic of the transmit chain.? I possibly need to
check all the bypass caps.? C86, C92 etc.? Also the
negative feedback caps, C261 & C262.? And the values of the
negative feedback resistors.? Bypass caps can be checked by scoping the
hot end for RF.
? ?I used to do this stuff for a living, but that was 40 years ago.
Hopefully it's like riding a bicycle :).? If it is an oscillation,
those are hard to find because everything oscillates at once...
? ? ? ? ? ? ? ? ? ? ? ? - Jerry KF6VB
On 2021-06-10 06:01, jerry@... wrote:
> Rafael,
>
>? ? I was thinking exactly this last night.? Self oscillation of the
> final stage around 2MHz?? Mixing with the outgoing CW?
>
>? ? If so, maybe it would oscillate also on SSB mode?? I'll try that
> today.
>
>? ? ? ? ? ? ?- Jerry KF6VB
>
>
>
> On 2021-06-10 05:30, Rafael Pinto [PU1OWL] wrote:
>> Jerry,
>>
>> Can this be some form of self-oscillation? It is so bad, this looks
>> like single-tone FM!!
>>
>> Rafael Pinto
>>
>>
>> Links:
>> ------
>> [1] /g/BITX20/message/89084
>> [2] /mt/83413015/243852
>> [3] /g/BITX20/post
>> [4] /g/BITX20/editsub/243852
>> [5] /g/BITX20/leave/10189903/243852/952924773/xyzzy
>
>
>
