It seems that I have a TX problem too. Just to prevent removing D36 for
nothing because it's fragile, could someone give a result that I should
read on my DMM when D36 is working properly ???
Le 04-06-24, à 13:59, Don Wilhelm a écrit :
Gerhardt,
Yes, I too would believe D36 is broken - it is quite fragile and will
crack
if the leads are bent too close to the glass body - HANDLE WITH CARE.
You can temporarily substitute a 1N4007 diode until you can obtain a
replacement (the 1N4007 was used in the D36 location until the keying
waveshape change was implemented). You can likely find a 1N4007
easier than
the proper PIN diode.
With the 1N4007 in D36, your keying waveshape may not be exactly
correct (it
will be close enough), and it should get you through the testing of
your K2.
73,
Don W3FPR
Life is what happens when you are making other plans
----- Original Message -----
At TP2 on transmit I get a nice signal on my oscilloscope, abt 0.005
Vrms
But behind TP2 the signal vanishes. All measurements are way too low,
if
present at all. At U10 Pin 4 there's only a short Jump to 5V and
immediately
back to 0 on keying. No HF detectable.
I unsoldered the Diode D36 and checked for resistance. Infinite in both
directions. Does this mean what I think? This D is broken?
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