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. In the
last ARRL FMT, all of my measurements were within 1 Hz, using only a K3
without even a TCXO.
Dave Hachadorian, K6LL
Yuma, AZ
-----Original Message-----
From: Louandzip via Elecraft
Sent: Wednesday, May 19, 2021 3:54 PM
To: Elecraft Reflector
Subject: Re: [Elecraft] Frequency Accuracy and stability
I count beats. One beat in 1 second and I'm off 1 Hz. One beat in two
seconds and I'm off 1/2 Hz. Easiest done if the side tone and received
signal are adjusted to be close in amplitude and there's little/no QSB.
Zero beats, and the frequencies would be exactly the same, but the practical
limitation is probably 1/4Hz in good conditions. The only things required
are a reference, like WWV, and my ear.
That is, after all, what the term zero beating means, adjust frequencies to
be the same until the beats stop.
Lou W7HV
On Wednesday, May 19, 2021, 3:30:49 PM MDT, Bob McGraw
<[email protected]> wrote:
I ordered my K3S with "KTCX03-1-F TXCO 1ppm f/w correction to 0.5ppm".
K3S-F s/n 10163
I use CW mode and CWT mode and tune to each of the WWV frequencies. By
pressing SPOT the radio resolves to the WWV frequency but will show any
error either + or - of the WWV frequency. By tuning up about 25 Hz and
then pressing SPOT and then tuning down about 25 Hz and using SPOT one
can easily see the error amount. If all is correct, it will return to
the WWV frequency +/- 0.0 difference.
I check 4 or 5 WWV frequencies and note any discrepancy. I then can
adjust the REF CAL up or down as needed and then re-check the WWV
frequencies as described above.
I find this method is preferable to the "zero beat" method and assures
the radio on all bands is +/- 2 Hz or better. Good enough for me.
73
Bob, K4TAX
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