Yes that is correct.........but one needs to make sure the sound card
calibration is correct.
I prefer to use CW mode with CWT active . Tune the radio to one of the
WWV frequencies. Thn press and release SPOT. This will match the
sidetone to the WWV carrier and adjust the radio to the correct
frequency. If for example, one tunes to 15.000.000 and presses SPOT
the radio may then move to 15.000.002. If so, adjust the Ref Cal down
about 3 or 4 Hz. And do the procedure again. It will take 3 or 4 times
and adjustments to get the radio "dead nuts on". Once done, then tune
up from WWV or down from WWV by 10 to 20 Hz and press SPOT again. The
radio should come to 15.000.000. Thus no listening, no zero beating,
no computer, no external software is needed. Everything is referenced
to the internal Reference. This also assures the sidetone frequency is
accurate at the user selected frequency.
73
Bob, K4TAX
On 5/25/2019 1:39 PM, Rick Bates (WA6NHC) wrote:
By ear is very close but if you already have WSJT-X, there is a calibrate mode
for the last few Hertz.
Rick WA6NHC
Smell Czech correction happen
On May 25, 2019, at 11:08 AM, Don Wilhelm <[email protected]> wrote:
Hank,
You don't need a highly accurate frequency counter. You can get closer with
the beat note method.
You can use an audio spectrum analyzer (like Spectrogram or SpectrumLab)
running on your computer and the K3S rear headphone jack connected to your
soundcard Line In.
That will give you a visual display. When you turn on SPOT, if the two audio
frequencies are far enough apart, you will see two both of them.
When both frequencies are quite close, they will appear as one signal.
When they are VERY close, you will see the "signal" begin to oscillate in
amplitude - when that oscillation slows to zero, that is the beat point you are seeking.
In practice it is difficult to get it to exactly zero, but get it as slow as possible -
one or two oscillations each minute is practical using that method.
If you need Spectrogram (Windows application), go to my website www.w3fpr.com
and scroll near the bottom of the opening page to find the links. Those are
internal links on my website, and the files have been thoroughly scrubbed for
virus - although Norton does not like them because they do not have a large
enough user list for that application.
73,
Don W3FPR
On 5/25/2019 1:23 PM, [email protected] wrote:
I have just installed the 1 PPM TXCO in my K3S. I bought the K3S last
October as a kit and have installed many options since then.
One thing I'm concerned with is the reference calibration. Without a good
frequency counter, I'm using WWV on 15Mhz and using beat cancelation. My
ears are pretty good, but no match for a good frequency counter.
Any guys in the NW GA area (Tennessee, Alabama, and North Carolina area
really) that would be willing to help me set that reference calibration with
a good counter? I'd be willing to pay you for your time!
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