[Elecraft] K2 - no TX power problem

[JEAN-FRANCOIS MENARD]

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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===============================================
Jean-François Ménard / VA2VYZ
va2vyz at rac.ca

Club d'Astronomie Amateur de Sherbrooke
Club Radio Amateur de l'Estrie

Mon site web personnel : http://homepage.mac.com/jfmenard
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