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Hi Andy, yes this is a great idea which will be next tomorrow morning.
I just had time today to re-mesure the 2 solder joints at the SWR PCB (red and blue arrows on your drawing) : my measurements on 20K multimeter position were false and good at the same time, I explain: it depends on polarity, you have a short on one way, but you have the values I wrote for the opposite polarity, and this, is working for both the SWR and CAL positions on the switch.
I guess you have the same on your radio, and to me it means the diodes are good. I tried to measure them in circuit and got around 0.405ish mesurements, which tells me they are good as Schottky diodes.
The 4 resistors (100, 150 and 2x 1k) are good too.
I can de-solder tomorrow the 2 leads going from the PCB to the switch to see what I get, but i am even more puzzled at where the problem can be :/
Any opinion Andy?
Thanks a lot by the way,
Chris

<blockquote data-quote="Christophe Barbe" data-source="post: 737432" data-attributes="member: 54009">Hi Andy, yes this is a great idea which will be next tomorrow morning.I just had time today to re-mesure the 2 solder joints at the SWR PCB (red and blue arrows on your drawing) : my measurements on 20K multimeter position were false and good at the same time, I explain: it depends on polarity, you have a short on one way, but you have the values I wrote for the opposite polarity, and this, is working for both the SWR and CAL positions on the switch.I guess you have the same on your radio, and to me it means the diodes are good. I tried to measure them in circuit and got around 0.405ish mesurements, which tells me they are good as Schottky diodes. The 4 resistors (100, 150 and 2x 1k) are good too.I can de-solder tomorrow the 2 leads going from the PCB to the switch to see what I get, but i am even more puzzled at where the problem can be :/Any opinion Andy?Thanks a lot by the way,Chris</blockquote>

[QUOTE="Christophe Barbe, post: 737432, member: 54009"] Hi Andy, yes this is a great idea which will be next tomorrow morning. I just had time today to re-mesure the 2 solder joints at the SWR PCB (red and blue arrows on your drawing) : my measurements on 20K multimeter position were false and good at the same time, I explain: it depends on polarity, you have a short on one way, but you have the values I wrote for the opposite polarity, and this, is working for both the SWR and CAL positions on the switch. I guess you have the same on your radio, and to me it means the diodes are good. I tried to measure them in circuit and got around 0.405ish mesurements, which tells me they are good as Schottky diodes. The 4 resistors (100, 150 and 2x 1k) are good too. I can de-solder tomorrow the 2 leads going from the PCB to the switch to see what I get, but i am even more puzzled at where the problem can be :/ Any opinion Andy? Thanks a lot by the way, Chris [/QUOTE]

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