[time-nuts] WWVB D-PSK document
Bob Camp
lists at rtty.us
Sun Mar 31 23:05:27 UTC 2013
Hi
If the VCXO's tuning voltage runs from zero to 5 volts, and the VCXO tunes 0.1 Hz / 0.5 volts at 12 MHz, then it has a total range of about 1 Hz at 12 MHz. That's about 0.08 ppm of tune range. A generic crystal likely has a tempo of 0.1 to 1 ppm / C. My guess is that you will need a bit more tuning range on the VCXO to keep things locked long term. Putting your tuning cap in series with the varicap should help this a bit. You may also need to add a coil in series with the crystal.
Bob
On Mar 31, 2013, at 6:30 PM, paul swed <paulswedb at gmail.com> wrote:
> Thanks John.
>
>
> On Sun, Mar 31, 2013 at 5:21 PM, John Ackermann <jra at febo.com> wrote:
>
>> At Paul's request, I've put his document about the PSK scrubber for WWVB
>> at:
>>
>> http://www.febo.com/pages/**wwvb_psk/WWVB%20d-psk-r%**2003302013.pdf<http://www.febo.com/pages/wwvb_psk/WWVB%20d-psk-r%2003302013.pdf>
>>
>> John
>> ______________________________**_________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/**
>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
>> and follow the instructions there.
>>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
More information about the Time-nuts_lists.febo.com
mailing list