And perfect will never occur. So one best think of adequate.
73
Bob, K4TAX
On 6/10/2020 1:42 PM, W2xj wrote:
adequate is not perfect. YMMV
Sent from my iPad
On Jun 10, 2020, at 2:07 PM, Bob McGraw K4TAX <rmcg...@blomand.net> wrote:
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
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