Posted by
John Oppenheimer on
Sep 03, 2011; 1:24pm
URL: http://elecraft.85.s1.nabble.com/K2-power-on-frequency-problem-tp6756612.html
I am a new K2 (#7212) user. I have been baffled by what I thought was my
inability to properly perform the frequency alignments. My last attempt
was to perform a factory reset and re-do PLL and BFO (Table 8-1 values)
calibrations.
I believe that I have found the issue, sometimes it appears that the VFO
frequency offset look-up tables are not used and a toggle through two
"CW REV" changes are needed.
Used a K3 CWT SPOT as a 4MHz monitor to adjust C22.
Using a K3, CWT, SPOT and K2 in in TUNE (with dummy load) to measure the
K2's frequency. Test process is:
Note: only the events in the below text were performed.
Power off K2 with F set to 7026.00
Power on: K2 F=7026.00 K3 F = 7026.146
"CW REV" "CW REV", K3 F = 7026.018
Power off K2
Power on K2 F=7026.00, K3 F = 7026.025
Power off K2
Power on K2, Move K2 F to 7027.00, K3 F = 2027.028
Power off K2
Power on K2 F = 7027.00, K3 F = 2027.145
"CW REV" "CW REV", K3 F = 7027.000
I was listening to the audio during the above process. There was a
notable change in the resulting pass-band audio when the "CW REV" "CW
REV" toggle was performed and the K2 frequency changed. Leading me to
believe that the VFO offset frequency was changed.
Though I can't find a reproducible process, I have found events where
during a K2 power on session, sometimes a "CW REV" "CW REV" is needed to
acquire correct K2 frequency.
Is this normal K2 operation, or do I have an issue with this K2?
John, KN5L
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