I have higher standards and always have. Sent from my iPad
> On Jun 10, 2020, at 2:45 PM, Bob McGraw K4TAX <rmcg...@blomand.net> wrote: > > 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 >>>>> >>>>> ______________________________________________________________ >>>>> 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 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 arch...@mail-archive.com
