[Elecraft] Calibration using WWV and a Smartphone

[Don Wilhelm]

All,

That is a good method.

If you wish to use a computer rather than a smartphone (some of us only 
have 'dumb' phones), you can feed the radio audio into a soundcard and 
use an audio spectrum analyzer like Spectrogram or Spectrum Lab.
With the audio spectrum analyzer, you do not have to go through the 
calibration process if your soundcard/computer produces accurate 
measurements.  Go directly to SSB and you can see the pitch of the tones 
on the display.

You can download a clean copy of Spectrogram from my website 
www.w3fpr.com - look for the link near the bottom of the opening page. 
The link is to a local file on my website and has been scrubbed many 
time for virus.  I have heard that copies of Spectrogram at other web 
locations have contained viruses.

73,
Don W3FPR

On 12/17/2016 4:37 PM, Robert Glorioso wrote:
> Here is how I do it.
>
> 1. Load a Music tuning app that also reports frequency in Hx on your smartphone.  “PANO TUNER” on the iPhone is Free,  (Not a type, PANO is correct.)
> 2. Tune in WWV on AM on 5, 10, or 15 MHz.
> 3. Calibrate the iPhone tuner using 440, 500 or 660 HZ tone that WWV transmits at different times for a few minutes by noting the frequency difference.  Mine was well within 1Hz.  The tone schedule is on the WWV website.
> 4. Set the rig to USB and move the carrier until you read 440, 500 or 600Hz lower on your dial,
> 5. Read the frequency on your smartphone and then recalibrate the rig to read 440, 500 or 600 Hz.
> 6. You’re now calibrated to within at least 1Hz of the right frequency.
>
> 73,
> Bob
> W1IS
>
>
>
> Message: 1
> Date: Fri, 16 Dec 2016 20:12:17 -0500
> From: N2ZDB at aol.com <mailto:N2ZDB at aol.com>
> To: elecraft at mailman.qth.net <mailto:elecraft at mailman.qth.net>
> Subject: [Elecraft] Sync AM and checking VFO accuracy using WWV
> Message-ID: <c4be67.2ee04eb2.4585eaf0 at aol.com <mailto:c4be67.2ee04eb2.4585eaf0 at aol.com>>
> Content-Type: text/plain; charset="US-ASCII"
>
> If I set my K3's VFO to WWV at 5.000000 MHz with AM-S on....and I adjust
> "REF CAL" to a number where
> my VFO's frequency readout is exact or near this number +/- maybe a Hertz
> or two. Is this an accurate way to calibrate my K3?
>
> It seems to be very accurate as far as I can tell.
>
> Has anyone used this method?
>
> Michael
> N2ZDB
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