[Elecraft] Sync AM and checking VFO accuracy using WWV

[Fred Jensen]

There are a myriad of ways to do it if you're interested, however don't 
underestimate the accuracy you can achieve with your ears and ability to 
count when you get the levels equalized.  If you count 6 noise peaks in 
60 sec, you're within 0.1 Hz.

Something that hasn't been mentioned [and that I only alluded to in a 
previous post] is doing this during the tone-free minutes on WWV.  The 
tone modulation can make it very difficult, and in some cases your 
result can be off by the frequency of the tone.

73,

Fred K6DGW
Sparks NV USA
Washoe County DM09dn

On 12/18/2016 10:56 AM, Brendon Whateley wrote:
> Depending on why you want the accuracy, I think you could improve things by
> building a phase comparator to "listen" to the radio output frequency
> against a local reference. That would allow you to get much closer than
> using your ears as a phase detector. That should get you accuracy of a few
> % of 1Hz at your frequency you are measuring.
>
> If you are really serious about accuracy, you can build a frequency
> reference based on the WWV transmissions that will get you to within 1 part
> per billion at 1MHz without too much trouble.
>
> There was a QEX article recently, which you can find on the web at
> http://www.arrl.org/files/file/QEX_Next_Issue/2015/Nov-Dec_2015/Magliacane.pdf
> .
>
> I'm sure that spending money on a GPS reference would be quicker, but less
> fun than building a project.
>
> If you go down that road, you'll be well on your way to winning frequency
> measuring contests!
>
> - Brendon
> KK6AYI