[time-nuts] WWVB d-psk-r update. Seems a reasonable solution
paulswedb at gmail.com
Sat Mar 30 17:41:11 EDT 2013
The reciever is now drawn up in expressPC. Will add in the dividers to
another drawing I simply could not get it all in the same schematic. Not
that there is a lot expressPC has sizing limitations. I know there is
better... Just no time to tinker.
Its going to be interesting getting the schematics into a word or pdf doc.
Will repond to other comments. But for Atilla the issue with simple stuff
like doubler dividers is simply noise and competition from MSF.
On Sat, Mar 30, 2013 at 11:12 AM, Bob Camp <lists at rtty.us> wrote:
> I think it's pretty safe to say that the Vectron part mentioned is a VCXO
> with a crystal as the resonator. Indeed a ceramic resonator or an L/C
> resonator part would have a bit more drift and lower Q than a crystal based
> part. I would not try something like this with anything other than a
> crystal based part. At least as far as the commonly available stuff goes.
> I'm sure you could make it work with a hydrogen maser as the frequency
> source and a bit of DDS magic...
> On Mar 30, 2013, at 10:23 AM, Jim Lux <jimlux at earthlink.net> wrote:
> > On 3/29/13 9:01 AM, Bob Camp wrote:
> >> Hi
> >> Too much tuning range is easy enough to fix. Use a pot to set it on
> frequency and then hook it to the rest of the "stuff" with a fixed
> resistor. The gotcha would be if the poor thing drifts so much that it
> *needs* the wide range to stay in lock.
> >> My guess is that you could buy a hundred VCXO's at auction for less
> than the cost of trying a dozen samples.
> > wide tuning range VCOs have lower Q resonators, so the "outside the loop
> BW" noise will tend to be worse.
> > The other problem I have found is that wide tuning range VCOs tend to
> drift more (that is, with a constant input voltage, their frequency changes
> more as they warm up or otherwise change temperature).
> > It's a matter of sitting with the online order site open in one window,
> and the Vectron or whoever website open to their catalog in another and
> going back and forth comparing part #s..
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