[time-nuts] WWVB d-psk-r update. Seems a reasonable solution
lists at rtty.us
Sat Mar 30 18:09:44 EDT 2013
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.
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.
> 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:
>>>> 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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