[Elecraft] Zero beat WWV

[David Wilburn]

Good stuff Don.  Thanks.  Yea, the 9999.99, I was not worried about at 
all.  It is the 1300 Hz I have to wander over to, to get the CW signal 
that is bothering me.  I am experiencing the same thing with local 
signals, I have generated from other radios.  I will check out WWV 
during the quiet time and see what I find.

As far as "Just adjust the CW BFOs so the passband is centered...", what 
are you telling me to do here?  I have run through c22 adjustment 
(started out at 10000.09 for WWV, and got to 9999.99 using the "Wayne" 
method), CAL PLL and CAL FIL (with Spectrogram) at least 3 times. 
Should I go back and do the BFO test?

Admittedly, it is possible, even likely, that I am making the same 
mistake each time I have run them.  I have seen the U and L frequency 
readout get better, but not the CW.  Additionally, it transmits on the 
correct frequency.

David Wilburn
dave.wilburn at verizon.net
K4DGW
K2 #5982


Don Wilhelm wrote:
> Dave,
> 
> If you have WWV properly tuned at 9999.99 (when in SSB mode), that is 
> only 10 Hz off frequency, and is well within the range of error to be 
> expected with the K2.  The digital quantizing error is about 20 Hz.
> 
> The K2 always displays the frequency of the carrier - so when tuned 
> properly to WWV, you will hear (or see on Spectrogram) the tones 
> demodulated (as you have done), but when switching to CW, you should 
> hear the carrier at the pitch you have set for the sidetone.
> 
> When listening to WWV in CW mode it is easy to mistake one of the tones 
> they transmit for the carrier.  At the times they transmit a 600 Hz 
> tone, you will be able to hear discrete signals at 9999.40, 10,000.00 
> and 10,000.60 since it is an AM signal transmitting a 600 Hz tone. (You 
> can hear one signal at the carrier minus the transmitted tone pitch, the 
> carrier itself, and another signal at the carrier plus the tone pitch.) 
>  If the CW filter is narrow enough, you will hear each of these signals 
> as separate signals in the receiver - you must be careful to identify 
> the actual carrier.  Using the wrong one will create a large apparent 
> error in your dial readout.  It is best to tune WWV during the minutes 
> they do not transmit a tone - tune the carrier to your sidetone pitch 
> and the dial should read correctly.
> 
> Just adjust the CW BFOs so the passband is centered at your chosen 
> sidetone pitch (using a noise input, NOT a single signal) - and set the 
> dial calibration in LSB or USB, then believe that the K2 will take care 
> of the offset for you.  On CW, the dial readout will be the carrier 
> frequency of the station you are listening to and will also be the 
> frequency you will transmit on.
> 
> 73,
> Don W3FPR
> 
> David Wilburn wrote:
>> I have setup Spectogram, and have 500 & 600 Hz markers setup.  I then 
>> set the K2 to 10000.00, in U mode, and adjust the frequency until I 
>> have either 500 or 600 Hz depending on which minute it is (odd minutes 
>> being a 600 Hz tone and even being a 500 Hz tone, even though this 
>> seems backwards of how it should be).
>>
>> I then used this zero beat reference, and the procedure on page 101 of 
>> the K2 manual so that I have it down to U or L mode is zero beat at 
>> 9999.99.
>>
>> I notice the calibration on page 101 of the K2 manual says to use U or 
>> L mode.  My question, is how much should the offset be when I go to CW 
>> mode?  I am trying to track down why my CW RX frequency is so far from 
>> my USB frequency (was 1500 Hz off at one point). I have it better, but 
>> I am sure the issue is with how I did the alignments.
>