Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

I calibrate all my rigs with the WWV/spectrum display software method and it's never gotten me in trouble! From my K3s to my TS2000 to my FTDX3000, they all are dead nuts on thanks to this easiest of methods! Ken At 01:22 PM 12/18/2016, ab2tc wrote: Hi, Boy, this thread is now incredibly

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

Hi, Boy, this thread is now incredibly long and I am not sure it if I want to risk sticking my neck out with another entry. But I will. There has been an intense debate for at least the past 8 years as to what constitutes the "best" way to adjust the reference oscillator to the best accuracy.

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

Not having a Windows machine, I tried using both fldigi and cocoaModem which have waterfall displays. Both provided usable results. Getting close with the computer display and then zero beating using the procedure in the manual will probably be the best approach. 73 Bill AE6JV On 12/16/16

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

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

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

.  Mel, K6KBE From: Ron D'Eau Claire <r...@cobi.biz> To: 'Brendon Whateley' <bren...@whateley.com> Cc: 'Elecraft Reflector Reflector' <elecraft@mailman.qth.net> Sent: Sunday, December 18, 2016 11:49 AM Subject: Re: [Elecraft] Sync AM and checking VFO accuracy using W

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

: Elecraft Reflector Reflector Subject: Re: [Elecraft] Sync AM and checking VFO accuracy using WWV 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 yo

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

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

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

Brian, The higher the WWV frequency, the possible percentage of error goes down. One or two Hz is a smaller fraction of 20MHz than at 5MHz. In the K3, you are calibrating the reference (out of the synthesizer) rather than calibrating the actual VFO frequency. The actual VFO frequency is

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

Fair question ... actually a good question. Short answer: On vintage receivers, the VFO freq [the local oscillator that heterodynes to the IF freq] is switched for each band ... except of course if it's a Collins radio. It's a single dial with multiple fixed scales but multiple frequency

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

Fred, Don: I ask because I am curious. On any older receiver, calibration at 20 MHz would not guarantee cal below that ( or at any other frequency ). One could be 5 hz high at 30 MHz but 10 hz low at 7 MHz. Why is the K3 different? Brian Denley KB1VBF Sent from my iPad > On Dec 17, 2016, at

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

I guess it depends on how accurate you want your K3 frequency display to be. I think AM-S will warp the frequency a tiny bit to sync the carrier so that may not be the best mode. I'd also go as high as you can on WWV. Wayne suggested a method that is somewhere on the E-site which I used--

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

My method: http://elecraft.365791.n2.nabble.com/Ref-Osc-Cal-Method-4-td2595451.html On 12/16/2016 7:52 PM, Don Wilhelm wrote: Michael, I don't think that is adequate. First of all, use the highest frequency WWV that you can receive. Second, do not use AM-S. That mode will synchronize with

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

Very timely - just performed the operation with the help of the manual (Page 53 on the K3-S manual) and these extra instructions. Many thanks Tim A45WG > On Dec 17, 2016, at 6:52 AM, Don Wilhelm wrote: > > Michael, > > I don't think that is

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

Michael, I don't think that is adequate. First of all, use the highest frequency WWV that you can receive. Second, do not use AM-S. That mode will synchronize with the frequency of the AM carrier, and may not produce a true dial frequency. Us SSB - either LSB or LSB and tune for the tones

Re: [Elecraft] Sync AM and checking VFO accuracy using WWV

This is exactly the method I use. 73, Doug, KH6U Sent from Mail for Windows 10 From: Michael via Elecraft Sent: Friday, December 16, 2016 3:16 PM To: elecraft@mailman.qth.net Subject: [Elecraft] Sync AM and checking VFO accuracy using WWV If I set my K3's VFO to WWV at 5.00 MHz with AM-S

[Elecraft] Sync AM and checking VFO accuracy using WWV

If I set my K3's VFO to WWV at 5.00 MHz with AM-S onand 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