[Elecraft] K2 - 40m transmit problems

Zac Brown zac_brown at mac.com
Sun Jan 20 13:28:16 EST 2008


Don,

I rechecked/reheated RFC14 and R20. The voltages on Q19 are in-line now.

Thanks,

Zac

Don Wilhelm wrote:
> Zac,
> 
> For the bad voltages on Q19, look carefully for a bad solder connection 
> on RFC14 (poorly tinned toroid lead perhaps?) and/or R20.   The 
> resistance measurement from Q19 source to ground should be close to 270 
> ohms.  Note that this condition may or may not be related to your HiCur 
> situation.
> 
> As for the HiCur message - is that message present when transmitting 
> into a dummy load?  Does it occur at all power levels?  Is this the base 
> K2 only or does it have the KPA100 installed?  Do you have the KAT100 
> also?  If you have the KPA100, has it been updated with the KPA100UPKT - 
> if updated, was C31 changed to 0.22 uf during the upgrade?  Many 
> questions that I must know before venturing an intelligent comment.
> 
> 73,
> Don W3FPR
> 
> Zac Brown wrote:
>> I'm getting HiCurr messages when I transmit on 40m, the bargraph shows 
>> multiple bars lit, and I can hear a very faint squealing sound coming 
>> from the K2 when I transmit.  I've built the RF probe and I'm going 
>> through the signal tracing steps in the manual.
>>
>> On the PLL Reference Oscillator steps (appendix E, page 10) I am 
>> measuring U4 pin 1 at 0.252 V.  The signal tracing instructions say 
>> that it should be 0.8-1.8 vrms.  I then started looking at Q19 and am 
>> measuring G=1.0, S=-1.0, D=8.0 with my DMM.  According to the DC 
>> voltage tables, I should be seeing G=0, S=0.8, D=8.0.
>>
>> Any advice on where I should look next?
>>
>> Thanks,
>>
> 


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