[time-nuts] WWVB Chronverter update progress

Bob kb8tq kb8tq at n1k.org
Tue Aug 28 16:25:50 EDT 2018


Hi

The clock could care less if the harmonics are at -10 dbc or -100 …..

Bob

> On Aug 28, 2018, at 2:54 PM, paul swed <paulswedb at gmail.com> wrote:
> 
> Well the 9.6 MHZ/160 is working really well. The vectron VTO is .032 Hz
> high and when heated to 100 drops to .005 Hz.
> Carrier lights turn on ASAP on the spectracoms and truetimes. So time to
> add the modulator and some low pass filtering and then antennuate to
> something like -60 to -70 db for the good clocks.
> Then finally back to the chronverter and adding gps to it for the correct
> time.
> Regards
> Paul
> 
> On Mon, Aug 27, 2018 at 11:00 PM, paul swed <paulswedb at gmail.com> wrote:
> 
>> Ed
>> Thanks for the clue. Well on the way with the 9.6 MHz. But I think I may
>> also have something in the 15.360 range.
>> Darn soldered things to quickly. :-)
>> 
>> On Mon, Aug 27, 2018 at 10:50 PM, ed breya <eb at telight.com> wrote:
>> 
>>> I remember I have a bunch of 15.360 MHz TCXOs that were very common - I
>>> think they came from some big old cell phones I junked out long ago - you
>>> know, the kind that were bolted into the car. This is still a standard
>>> frequency, and it would be nice for making 60 kHz by simply diving by 256.
>>> A quickie search for modern ones shows this as an example:
>>> 
>>> https://www.mouser.com/datasheet/2/3/AST3TQ-28-461101.pdf
>>> 
>>> I believe this class of parts will easily do the job, and there are
>>> likely lesser, cheaper ones that would suffice.
>>> 
>>> Ed
>>> 
>>> 
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>> 
>> 
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