[Elecraft] BFO test failure (K2), Part 2 of RF board test

[Don Wilhelm]

Chuck,

Do you have any way of checking the RF Voltage at TP2 while CAL FCTR is set
in the menu? An Oscilloscope?, an RF Probe?  Page on through the
Troubleshooting section until you get to the Signal Tracing part - build the
RF Probe from the parts that were supplied with the K2 kit and measure the
signal at U11`pin 6 - 0.2 to 0.7 volts is expected (follow the steps on page
10 until you find incorrect results).

The BFO signal at TP2 is not a strong as the signal at TP1 - If the counter
probe input transistors (Q9 and Q10 on the control board) are functional,
but not up to par, it is possible to obtain a reading at TP1 but not at TP2.
If the BFO RF voltages check out OK and the internal counter probe still
shows a zero frequency reading, the counter is suspect - either the probe
itself or the transistors.

Do you hear anything from the reciever at all?  Even if you hear only
receiver noise, it is likely that the BFO is working and the problem lies
with something else.

73,
Don W3FPR


> -----Original Message-----
>
> My BFO does is not working. The freq. counter reads 0000.0.
> I have tried following other posts on the subject and checked the
> voltages on U11 and verified that R98 and R99 are present, L33 is
> installed correctly.
>  Are their any voltage checks I can run on Q24, or L33.
> Is there something else I can check? The troubleshooting guiding in the
> manual is based on info messages, which I am not getting any.
>
> I just completed the VCO voltage checks and that ran good. Everything
> was within range spec'd by the manual.
>
> Thanks, Chuck - K3TNT
>