[time-nuts] WWVB Chronverter update progress

paul swed paulswedb at gmail.com
Tue Aug 28 17:04:42 EDT 2018


Totally locked up just fine its looking very good. What interesting is the
chronverter actually puts out the correct julien date for the old truetimes.
>From this point its time to get a gps unit hooked up to the chronverter and
then filtering and an amplifier to drive a loop stick antenna. Think that
may radiate enough to cover the house.
Lastly putting the whole think in a rack unit. To hack a DC 468 case or
not. That is the question. Suspect the answer is that would look nice.
Regards
Paul

On Tue, Aug 28, 2018 at 4:57 PM, paul swed <paulswedb at gmail.com> wrote:

> Yup running it without any filtering at the moment. Just completed the
> modulator using a tri-state 74ls125. Works well.
> But now the real test, does the symetricom lock to the chroneverter? As I
> type this it just did. Running about -50 db. Now for the true time.
> Regards
> Paul
>
> On Tue, Aug 28, 2018 at 4:25 PM, Bob kb8tq <kb8tq at n1k.org> wrote:
>
>> 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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