[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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