[Elecraft] K1 Issue. Lost reception when transmitter stage completed.

[Les Garwood]

Thanks again,  Don.
I've been using Elecraft's signal injector;  you may know it puts out 50
micro volts on the high setting.
I'll try your suggestions but I think I did part of them already.
BTW, I'm using my Android phone so it's tough to write a lot of detail.

Les
On Aug 22, 2014 11:05 AM, "Don Wilhelm" <w3fpr at embarqmail.com> wrote:

> Les,
>
> You did not mention your test gear nor any information about your setup,
> so I have to make some guesses and ask some groundwork questions.
>
> Are you injecting RF from a signal generator to the BNC jack?  If so, is
> that signal large enough to register on what you are using to determine
> signal or no signal ('scope with 10X probe or RF Probe)?
> Do you have the jumper installed in J2 of the band board?
>
> Turn the signal generator off, then on while observing the level at band
> board J8 pin 8 - you should see a rise in the RF being measured.  If not,
> the signal level is too low to register on your measurement device.
>
> The Signal Tracing section starting on page 5 of the K1 manual appendix
> gives you an orderly sequence for troubleshooting.  Where does the signal
> level drop below the expected level?  That point is just past the point of
> failure.
>
> 73,
> Don W3FPR
>
> On 8/22/2014 1:03 PM, Les Garwood wrote:
>
>> Dear Fellows,
>>
>> I just finished construction of my K1.  The receiver stage worked
>> perfectly
>> until I finished the transmitter stage.  I still get audio hiss and volume
>> but no signal on any band, AGC on or off, attenuator on or off.
>> All the voltages and resistances check out except the anode of D9,
>> according to the manual, is supposed to be > 100k.  I'm sure this is an
>> error, however,  since the DC path to ground from that point goes through
>> three resistors and a choke totalling only about a couple K,  which is
>> what
>> I measure.
>> I still get rf out of the VFO, and can trace it through the filter board,
>> J6, at pins 1,2 and 6, with my scope.  However,  there is no trace of
>> signal rf from the antenna on pins 1 or 8 of J7.
>>
>> I have no rf at the attenuator relay either, at pin 3, or any other.
>>
>> I can't quite figure out yet how the TR switch circuit works (or doesn't
>> perhaps) so it's hard to troubleshoot if it is the problem or not.
>>
>> Needing the filter board in place makes trouble shooting all the harder
>> too.  I wish I had a layout view showing the bottom of the rf board to
>> help.
>>
>> As always, any comments welcome and appreciated.
>>
>>
>>
>