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Hi Andy, i solved the "self-oscillation" kind of symptom by reflowing solders related to ground on lots of places on the PCB. It helped, i had a nice 15 mn QSO to France flawlessly.
SWR issue: still on going even after reflowing the solders of all the SWR-related circuit even the vertical board and having cleaned-up the pot with contact 61.
I am afraid some diode may have died on the SWR PCB.
Is there any way to have accurate readings without desoldering the whole thing and having the diodes in parallel with resistors?
If yes, do you have measurements of your copy or could you do so that we can make a comparison?
So that's it, even if it's a simple circuit, SWR fault not found yet.

[QUOTE="Christophe Barbe, post: 736998, member: 54009"] Hi Andy, i solved the "self-oscillation" kind of symptom by reflowing solders related to ground on lots of places on the PCB. It helped, i had a nice 15 mn QSO to France flawlessly. SWR issue: still on going even after reflowing the solders of all the SWR-related circuit even the vertical board and having cleaned-up the pot with contact 61. I am afraid some diode may have died on the SWR PCB. Is there any way to have accurate readings without desoldering the whole thing and having the diodes in parallel with resistors? If yes, do you have measurements of your copy or could you do so that we can make a comparison? So that's it, even if it's a simple circuit, SWR fault not found yet. [/QUOTE]

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