Good point. One needs to do a careful zero beat cal first, to make sure you
are in the ballpark. You can verify later by tuning to 9,999,998 and
counting the beats in 10 seconds. The number of beats on the two frequencies
should add up to 40.
Incidentally, by counting the number of beats in 10 seconds on 10,000,002
(or 9,999,998), you can estimate your residual frequency error in tenths of
a Hz (beyond the capability of the dial display). For example, if there are
23 beats in ten seconds, your radio is telling you that you are 2.3 Hz from
zero beat, so you are actually tuned to 10,000,002.3 Hz. That info can be
used to correct your results in the Frequency Measuring Test (FMT), but is
of no other practical use that I can think of. It was fun to beat some of
the big boys in the last FMT, using only a stock K3 without even a TCXO!
Dave Hachadorian, K6LL
Yuma, AZ
-----Original Message-----
From: Andy Durbin
Sent: Thursday, May 20, 2021 4:57 AM
To: [email protected]
Subject: [Elecraft] Frequency Accuracy and stability
"I tune to 10,000,002 and adjust REF CAL for 20 beats in 10 seconds, or as
close to 20 as I can get, with the granularity of the ref cal steps."
Zero beat has only one solution. Doesn't your method have two solutions,
only one of which is correct?
73,
Andy, k3wyc
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