Posted by
Ben Hofmann K1NT on
Dec 20, 2006; 7:16pm
URL: http://elecraft.85.s1.nabble.com/10M-birdie-and-other-assundries-tp442111p442112.html
If PC5M's calculations are correct, and these birdies
are caused by mixing products of the 4.9136 MHz IF
crystals in the K2 and the 18.432 MHz bias supply
crystal in the KPA100, and assuming his spreadsheet
calculations are correct, it seems that a crystal at
15.8735 MHz (+ or - about 9.5 kHz) would not produce
mixing products in any US ham band (including 5.3305
through 5.4065 MHz for 60m). Since this is not a
standard crystal frequency, I wonder what the cost
would be of a batch of custom crystals at this
frequency? It seems that even within general
tolerances for calibration and temperature stability
for both values of crystals this should be feasible.
Like I said, I don't know what the cost of a run of
custom crystals would be, but it may be something for
the folks at Elecraft to look into for future outgoing
KPA100's, and then those of us who wish, could
purchase one as a spare part to retrofit our existing
amps. Another alternative would be a separate
individual purchasing a batch of custom crystals for
sale to Elecraft users. Just a thought. What do you
all think?
-Ben K1NT
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