Ken,
You are correct, those K1's without the S2 switch make matters more
difficult for setting the Transmit Offset.
There is a procedure in the older K1 manual which has you short two
solder pads on the RF board to make that adjustment, but it does not
work as well as with the K1's with the switch.
My procedure for adjusting the TX offset on those older K1's is more
complex.
After adjusting the BFO to position the center of the FL3 passband at
the desired sidetone pitch, I set the K1 to receive a signal at the
same desired pitch. A signal generator is a handy tool, but an off the
air signal can be used if a signal generator (such as another
transmitter operating into a dummy load) is not available. If using an
off-the-air signal, make sure it does not change frequency - ARRL
bulletins or code practice signals are a stable source of on-the-air
signals.
Receive that signal generator (or on-the-air signal output) on the K1
and also on a separate receiver, and then do a TUNE with the K1 (into a
dummy load). Adjust the K1 C13 to the same audio pitch that the signal
generator (or on-the-air signal) frequency produced in the monitor
receiver (Spectrogram or other audio spectrum analyzer is helpful in
determining that pitch - any frequency will do - the important thing is
that the audio frequencies are the same).
You can try the procedure in the older manual, and if successful it will
produce the same result, but my test bench is set up with Spectrogram
and a monitor receiver, so the above procedure is the easiest for me.
73,
Don W3FPR
On 1/25/2016 9:16 PM, Ken Talbott wrote:
You said you built your K1 'years ago'. Are you sure you have an S2? If
yours is an early K1 there is no S2, this process is a bit more involved!
Don, can you help with those instructions? They are not in the current rev
of the manual.
Ken - ke4rg
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