[time-nuts] WWVB d-psk-r update. Seems a reasonable solution

paul swed paulswedb at gmail.com
Sun Mar 31 15:16:08 EDT 2013


Documents written and will convert to adobe later today. However the doc is
300KB in size and does not even contain pictures and strip charts so the
time-nuts mailbox won't accept that. Several of you in the past have been
kind enough to offer to host the file. If you can directly email me please
I will send the file to you directly.
Regards
Paul
WB8TSL


On Sat, Mar 30, 2013 at 6:09 PM, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> The "easy" way to get to pdf is normal a pdf translator loaded as if it's
> a printer. Anything that will print can (at least in theory) be translated
> to a pdf by this approach. In real life, nothing is ever perfect, but I've
> had good luck with them.
>
> Bob
>
> On Mar 30, 2013, at 5:41 PM, paul swed <paulswedb at gmail.com> wrote:
>
> > 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.
> > Regards
> > Paul
> >
> >
> > On Sat, Mar 30, 2013 at 11:12 AM, Bob Camp <lists at rtty.us> wrote:
> >
> >> Hi
> >>
> >> 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...
> >>
> >> Bob
> >>
> >> 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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