I use WSJTX but not in its CAL mode. Simply set the VFO for x.000 on
the highest frequency you can reliably hear WWV (10, 15, 20 or 25 MHz)
and "dial in" the audio tone (SSB or DATA A) to the proper 500/600 Hz
frequency using REF CAL.
I've stopped using the "toggle between USB/LSB or CW/CW_R" and match
the tone as it's far easier to set the trace on the waterfall -
particularly if one sets "bins per pixel" to 1.
73,
... Joe, W4TV
On 2021-12-19 12:04 AM, David Hachadorian wrote:
After exchanging emails with N4ZR, who started this thread, we think
this is the easiest procedure:
Tune the rig to 10.000 MHz in CW mode. Listen to the tone of the WWV
carrier, which should be close to your CW PITCH setting.
Switch back and forth between reverse cw and normal cw, adjusting REF
CAL until the tones are equal in pitch on normal and reverse.
This procedure should get you calibrated well within 1 Hz, much better
than required for any amateur radio application that I can think of.
Dave Hachadorian, K6LL
Yuma, AZ
On 12/18/2021 2:39 PM, Bob McGraw wrote:
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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