[Elecraft] K1 birdies - revised

[t.wells@blueyonder.co.uk]

Folks,

I'm revising my original statement - I was writing rubbish.

Note CAL OSC shows the VFO to be in the range 3008 to 3096 on all 4 bands (4
band filter unit). Also note, on transmit into 50 ohm dummy load, the bands
may not be well calibrated - maybe 2-3KHz off.

There are two birdies of concern. They are:

Birdy No. 1 in 10.100 Mhz Band - zero beat at 10170.7 (display 70.7) and has
an audible signal that appears *both sides* of zero beat. The audible signal
at display 71.2 is about S1 and the signal at display 70.4 is S5. At this
point CAL OSC says 3013 at zero beat. This signal is not related to the
VFO - it does not sound like VFO-type harmonics.Analysing the above, at a
VFO reading of 3013 my dial reading should be 10172KHz. This is only 343 Hz
off the 2nd harmonic of BFO Xtal 4915.

Birdy No2 in the 21MHz Band 21072.5 (display 72.5) . This is definately a
VFO related harmonic. Signal on upper side of zero beat eg at 72.7. CAL OSC
at zero beat is 3010.  7th harmonic of the VFO at 3010 is 21070 which is
pretty dammed close to my 21072.5 reading.

Any thoughts on these results?


Regards,

Tony
G7IGG