In referencing TF.NIST.GOV on page 251, I find it stated;
"When high accuracy is not required, probably and fastest way of
comparing the frequency of an oscillator to a broadcast standard is the
familiar heterodyne or zero beat method. "
And then on page 253, I find it stated;
" Usually, however, it is difficult to adjust an oscillator to exactly
zero beat with an HF carrier beyond the ground wave range of the
transmitter. The problem arises from rapid fluctuations in the received
signal strength and from propagation flutter in the received frequency."
References are: THE USES AND LIMITATION OF HF STANDARD BROADCAST FOR
TIME AND FREQUENCY COMPARISON. John T. Stanley, NIST.
As I indicated earlier, a frequency accuracy of +/- 1 Hz for ham radio
purposes is adequate. Likewise for time accuracy +/- 0.1 second is
adequate.
73
Bob, K4TAX
On 6/10/2020 11:52 AM, w4sc wrote:
How much doppler shift should be expected?
Sent from Mail for Windows 10
From: W2xj
Sent: Saturday, June 6, 2020 5:31 PM
To: w4sc
Cc: wes_n...@triconet.org; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3(s) main oscillator calibration
the problem with WWV is doppler shift.
Sent from my iPad
On Jun 6, 2020, at 5:27 PM, w4sc <w...@windstream.net> wrote:
I like the zero beat WWV method. Used it in the Navy to calibrate / PM the
10MHz frequency standards aboard ship. Requires the least amount of test
equipment! If you can receive WWV on 20MHz to calibrate the K3/K3S, all the
better,
Using a frequency counter I would think 0.1Hz resolution and attending
accuracy would be in order, plus an accurate time base in the counter, GPS
locked,,, or oven-ized, on all the time reference ,,, ect.
Ben W4SC
Sent from Mail for Windows 10
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to w...@w2xj.net
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to rmcg...@blomand.net
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
