Hi,
Uhm, yes. You want your pulling-range to handle all the drift and tempco
you reasonably can assume, and also that of the application and signal.
Since the signal is WWVB in this case, we can ignore that factor. Also,
you don't want to be completely de-tuned from start either. I'm sure
John knows this already.
Cheers,
Magnus
On 04/01/2013 01:05 AM, Bob Camp wrote:
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<[email protected]> wrote:
Thanks John.
On Sun, Mar 31, 2013 at 5:21 PM, John Ackermann<[email protected]> 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
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