[time-nuts] Z3815A Internal SMA 10Mhz Output

Adrian rfnuts at arcor.de
Tue Aug 21 10:11:09 EDT 2012


Nigel,

you can easily divide the 16.384MHz by 16.384 (2^14) to get 1 kHz for 
phase locking a 10 MHz oscillator with your GPS box.

Adrian


GandalfG8 at aol.com schrieb:
> Not "every" GPSDO has a 10MHz OCXO.
>   
> 5MHz is, or was, quite common, and I've come across at least one GPSDO
> with a 10MHz output that I assumed would use a 10MHz OCXO but that  also turned
> out to be based on a 5MHz unit.
>   
> Then there's the variant of the Trak Microwave 8821B, as just one  example,
> that uses a 16.384MHz OCXO from which they derive  a 2.048MHz output
> without 10MHz anywhere in sight.
> When I bought one of those a few years ago I assumed that  all 8821Bs would
> be 10MHz GPSDOs, or some nice round figure  anyway, and it never even
> occured to me to ask whether it might be  otherwise, which in this particular
> instance turned out to be a rather  expensive mistake:-)
>   
> regards
>   
> Nigel
> GM8PZR
>   
>   
> In a message dated 21/08/2012 09:39:09 GMT Daylight Time,
> azelio.boriani at screen.it writes:
>
> Every  GPSDO has only one 10MHz signal: the one coming from the OCXO. If
> there are  many outputs they must always be the same. When the GPS has the
> 3D fix (or  the position hold) and the algorithm has synchronized the OCXO,
> the 10MHz  can be said "locked" but, when speaking about GPSDO, the correct
> word  should be "disciplined". Yes, maybe there are NCOs and/or synthesizers
> to  put out different synchronized frequencies and signals based on the
> OCXO
> 10MHz.
>
> On Tue, Aug 21, 2012 at 1:14 AM, Jerry  <jsternmd at att.net> wrote:
>
>> In ZL1BPU's  GPSR-A User  Manual, it mentions that there are internal
> points
>> that provide access  to regenerated system 1pps, 10MHz and 19.6608MHz
> square
>> wave signals  which are present even before the system is locked.  After
> GPZ
>>   lock is the internal 10Mhz SMA connector output identical to 10MHz  sine
>> wave
>> reference available from the rear coaxial connector  block?
>>
>> Jerry
>> K1JOS
>>
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