[Elecraft] K2 Deaf

[kc2vmp]

Don,

Thank you for your guidance!  It turned I had a short to ground at R88 and 2.7K resistor at R89 from the UN-PCB supplement.  While I know it is common to place parts incorrectly, I was glad not to have made the mistake of simply not soldering something.

Again, thank you for the quick and very helpful "support", you are a tremendous asset to the community.

73,
kc2vmp
Rob Gault


On Oct 29, 2013, at 6:45 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:

> Rob,
> 
> Look at the mixer carefully, especially the silkscreen outline on the board.
> If it is installed backwards, the results will be much as you describe.
> 
> If the mixer is installed correctly, then you may have to build up the oscillator shown in Appendix A (or use a signal generator with much more output than the XG1 or XG2 can provide) and do the Receiver Signal Tracing steps shown in the manual Appendix A.
> 
> 73,
> Don W3FPR
> 
> On 10/29/2013 6:30 PM, Rob Gault wrote:
>> Initial receiver testing on 40 Meters (pg 67) can barely hear XG2/XG3 @
>> 50uV.  I've injected the 50uV from the XG2 directly to the input of the
>> rcv. mixer Z6 @ R73, no change.  VFO Input to the receive mixer looks good
>> on a scope, no IF signal to be found at pin 1 of J12.  Q22 voltages
>> nominal.
>> 
>> I've eyeballed all solder connections and Caps and Resistors and confirmed
>> values.
>> 
>> We have confirmed the injection and testing procedure on a known good K2,
>> lots of IF signal at J12 pin 1.
>> 
>> Looks like Z6 is the problem?  Any other ideas or thoughts?
>> 
>> 
>