The method I use seems to work great and be easy enough to do. No zero
beating required and no external measurements required.
Put the radio in CW mode, tune to a WWV frequency and press and release
SPOT. The radio will automatically zero to the carrier with a tone that
matches your preferred CW note. Then via the CONFIG MENU go to REF CAL
and adjust up or down with the VFO A knob, the number of Hz error the
previous SPOT routine disclosed. A 10 Hz change on the REF CAL will
equate to about 2 Hz at 10 MHz. I find that checking several
different WWV frequencies is even better using this method. To make
sure it is optimum, tune to 5 or 10 Hz above and below each of the WWV
frequencies. Press SPOT from both above and below and see how it
resolves. Usually I can get within 2 Hz or better on all of them. You
may need to do this several times. Be sure the radio has been on for at
least 1/2 hour to allow things to stabilize.
73
Bob, K4TAX
Message: 4
Date: Thu, 16 Dec 2021 18:46:59 -0500
From: Don Wilhelm<d...@w3fpr.com>
To: Pete Smith N4ZR<pete.n...@gmail.com>, Elecraft List
<elecraft@mailman.qth.net>
Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<81d4d693-6cd1-f11b-30b7-d4523ce74...@w3fpr.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Pete,
When using WWV to set the K3 reference, make certain you are listening
to the carrier.? WWV is an AM signal that is modulated by a 500 or 600
Hz tone on alternate minutes (440 Hz 2 minutes after the hour).? That
produces tones that are both above and below the carrier.
So be certain you are hearing the carrier and not one of the modulating
tones.
73,
Don W3FPR
On 12/16/2021 4:34 PM, Pete Smith N4ZR wrote:
I've been wondering for some time if my 10-year-old K3's frequency
calibration was off, because it seemed like most spots of me were well
off when I clicked on them, usually in one direction.? Not having a
frequency counter, I went to the alternative method outlined in page
49 of the manual.? I thought I did it all "by the book", but found
that when I was done 15-MHz WWV's carrier frequency (determined by
zero-beating the carrier) was almost 400 Hz low. Since I wasn't
looking for FMT-level accuracy, I went back to WWV and adjusted the
REF CAL setting by ear until 15.000 on my RX dial was as close to
zero-beat with WWV as I could tell. We'll see how it worked out, but I
wonder if I simply have some fundamental misunderstanding of what's
involved.? Wouldn't be the first time...
------------------------------
Message: 5
Date: Thu, 16 Dec 2021 17:01:50 -0700
From: David Hachadorian<k6ll.d...@gmail.com>
To: Pete Smith N4ZR<pete.n...@gmail.com>, Reflector Elecraft
<elecraft@mailman.qth.net>
Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<6453871f-7e7d-fa93-8a79-7b1efd5e4...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
You had it fixed, but then you broke it again. After doing the
alternative method on page 49, when you tune in to 10.0000 MHz in CW
mode, you should hear a CW note at the same frequency as your PITCH
selection.? I presume that is 400 Hz.
I got an extremely good score on last year's Frequency Measuring Test
using only that alternative calibration method.
73
Dave Hachadorian, K6LL
Yuma, AZ
------------------------------
Message: 6
Date: Thu, 16 Dec 2021 23:04:36 -0800
From: Ray<wa6...@gmail.com>
To: Wes<wes_n...@triconet.org>, "elecraft@mailman.qth.net"
<elecraft@mailman.qth.net>
Subject: Re: [Elecraft] K3 Frequency Calibration
Message-ID:<61bc3686.1c69fb81.f8fd0.8...@mx.google.com>
Content-Type: text/plain; charset="utf-8"
Gents
Go to a WWV signal, (5.000000) on a Good Strong Frequency.
Place the Mode To Upper SSB, Listen to the Beat note Tone Freq,
Now Move the Mode to Lower SSB. Adjust the Ref. Cal. Osc. until the Beat Note
is the Exact Same Freq
On Lower SSB and Upper SSB. Done
Ray WA6VAB K3
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