[Elecraft] 4 MHz oscillator is too high in frequency (K2)

[Sverre Holm (LA3ZA)]

My aging K2 (#2198) has developed a curious symptom in that the 4 MHz
oscillator cannot be adjusted lower than about 4,000,000.55 kHz. It has
probably been like this for a while and my BFO settings have probably been
done with the incorrect reference. I discovered it by observing that the
indicated frequency was about  0.75 kHz off.

Questions to the group:
1. Has anybody experienced anything like this, and can it be blamed on aging
of e.g. the crystal or on some of the capacitors in the circuit? (BTW I have
the KI6WX mod of the oscillator circuit
http://mailman.qth.net/pipermail/elecraft/2003-August/022687.html which has
worked well before)

2. How can I do a quick fix? e.g. by reinstalling C21=33 pF instead of the
10 pF of the mod above - or some other idea for a fix?

73
Sverre



-----
Sverre, LA3ZA

K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications: http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html
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