[Elecraft] K2 SSB Problem

[iz1dug at libero.it]

Hi Don thanks for answer.

I checked diodes D3, D4, D5 and are correctly installed.  I make some test after the check for supply you more informations.  I turn on the K2 on SSB, I push the PTT, speak into microphone and I have : power output OK, the s-meter follows the voice but the current increase and arrived at Hi Cur limit (also without speak into the microphone). Push the PTT is sufficient for have a current absorbed but the wattmeter don’t show any power out.
I hope that these additional information are sufficient to comprise the cause of this problem.

Thanks for your help

'73 de IZ1DUG Fabio


---------- Initial Header -----------

>From      : "Don Wilhelm" w3fpr at earthlink.net
To          : "iz1dug at libero.it" iz1dug at libero.it
Cc          : "elecraft" elecraft at mailman.qth.net
Date      : Sat, 28 Jul 2007 08:17:10 -0400
Subject : Re: [Elecraft] K2 SSB Problem







> Fabio,
> 
> I cannot be specific, but the most probable area causing that trouble is 
>   the area of Q2 and Q3 (those direct the BFO signal either to the 
> balanced modulator in SSB mode or back to the RF board for CW) or the 
> balanced modulator U5.
> 
> Check carefully to be certain diodes D5, D4 and D3 are inserted in the 
> proper direction and in the correct holes.
> 
> 73,
> Don W3FPR
> 
> iz1dug at libero.it wrote:
> > Hi,
> > 
> > I just finished installing the KSB2 module on my K2 QRP version (full optional).  I go to operate for the first time but when I push the PTT I get this problem:  the current absorbed increases (the voltage decrease) until it exceeds the value 4 A (set at this value after some test) and the K2 switch off.  The current and the voltage values reading on the K2 display and on the multimeter are the same. I have this problem on all band but only in SSB mode (K2 works correctly on CW mode with full power 10-13W). The problem is repeated every time when I push the PTT. 
> > I use the microphone Heil MH-2.   
> > Any suggestions? 
> > 
> > Good weekend 
> > 
> > Ciao,
> > 
> > IZ1DUG, Fabio
> > 
> > K2/QRP #1702 and K2/100 #5909
> 


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