Mike,
While what you say about the K1 display indicating the transmit carrier
frequency is technically correct, I believe you are over-complicating
things. The K1 (and all Elecraft products) properly calibrated will
indicate the transmit carrier frequency - so when receiving 10 MHz WWV,
the display should indicate 10000.0 kHz, and the transmit frequency will
be at that same frequency (no, one should not transmit at that frequency).
If one follows the instructions in the manual, everything will "fall
into place" - I paraphrase:
1) change to FL3 and set the BFO trimmer (C20) to center the received
noise in the filter passband at the desired sidetone pitch. Note that
this is quickly observed by using an audio spectrum analyzer (such as
Spectrogram) running on the PC and connecting the headphone output to
the computer soundcard. The antenna input should be broadband noise,
not a single frequency signal.
2) turn the switch on the bottom of the RF board to the TEST position
and adjust the TX oscillator trimmer C13 to place the signal at the same
pitch as the sidetone pitch.
3) Tune to a signal of known frequency (for each band) and change the
CAL OPF menu parameter so the displayed frequency is the same as the
signal frequency. Note, tune the signal to the same sidetone pitch as
you used above.
Note that these steps should be done in the order listed, each step
depends on the one before it.
Done, no "fussing" - the key is that you tune a received signal to the
same pitch as the sidetone - the rest is automatic.
73,
Don W3FPR
On 10/29/2013 2:46 AM, Mike Morrow wrote:
Jim / KI9M wrote:
To use these spurs to calibrate the K1 frequency display it must be
remembered that, properly set up, the K1 LCD should show *transmitter*
frequency. The K1 receiver functions in LSB mode on all bands with
existing filter board designs. This means that if the receiver is
zero-beat with 10000 kHz WWV, the transmitter should actually be set
to transmit a signal that is *below* 10000 kHz by the amount of CW
offset for which the K1 is adjusted. My K1 uses an CW offset of 600
Hz. That means that when my K1 is zero beat with 10000 MHz WWV, the
frequency displayed should be 600 Hz below 10000 kHz, or 9999.6 kHz.
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