All,
OK, I did it. Made up a counter probe from a hunk of
rg316, crimped a couple of dupont female clips onto the end,
put them in a shell, squished a dab of hot melt glue between the pins so
they couldn't short out, slipped over a bit of shrink...etc.
I recently acquired a GPSDO ( GPS Disciplined Oscillator ) that is
supposed to emit 10MHz accurate to a tiny fraction of a Hertz. Will be
using that to calibrate the frequency counter. But for the nonce...
... I redid all 8 CW BFO settings - first wrote down what they were - by
holding a tablet up to the K2 and running spectrum analyzer software I
got off Google Play. I centered each passband at about 600Hz.
The rig is transformed. Now all of the selectivity settings are
completely usable. Wish it had been like this yesterday. And I wish
there were more signals to listen to today :).
- Jerry KF6VB
On 2021-06-28 08:14, Don Wilhelm wrote:
Jerry,
Yes, you need to have the counter probe plugged into TP2 to save thee
BFO frequency.
You can build your own probe - if you use #14 solid wire, it will fit
nicely into the test points.
Solder the 11pF right above the tip and coax up to the header on the
Control Board - the shield goes closest to the left side panel.
73,
Don W3FPR
On 6/28/2021 11:00 AM, jerry wrote:
Hello all,
I note that my new ( to me ) K2 is not well set up on the BFO for
the narrow CW filters. It's fine for the 1.5kHz one, but the audio
passband is too high for all the narrower ones - so I cannot "spot"
tune. If my sidetone is set to say 600Hz,
it's on the lower slope of the audio peak.
It seems to be straightforward to adjust the BFO per filter with the
CAL FIL function. With a tablet running a spectrum analyzer, I can
pull the audio spectrum right down to where it needs to be, no
problem.
HOWEVER, when I try to save it, I get "INFO 230" which means that
the frequency counter is not connected to the BFO. And the passband
doesn't stay changed.
Is it true that the rig will refuse to save the BFO setting unless
it can measure the BFO frequency?
My radio came to me without a frequency probe. I do have one on
order from Elecraft. I also have enough junk to make one. A hunk of
RG316, some dupont connectors, an 11pf dipped silver mica capacitor.
But - at the moment, I really don't want to do any of that stuff. I
just want to slide the audio output spectrum down to where I can get
on with operating. And I'm not interested in the numerical BFO
reading. Ultimately, I will set up the filters from scratch - I have
the upgraded crystals AND the SSB adapter on order.
Can the radio REALLY not save the BFO setting unless it can measure
it?
- Jerry KF6VB
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