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

Bob Camp lists at rtty.us
Sun Mar 31 15:27:18 EDT 2013


Hi

I'm sure the "usual" web sites would be quite happy to host the files.

Bob

On Mar 31, 2013, at 3:16 PM, paul swed <paulswedb at gmail.com> wrote:

> 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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