[time-nuts] Z3815A Internal SMA 10Mhz Output

GandalfG8 at aol.com GandalfG8 at aol.com
Tue Aug 21 05:28:04 EDT 2012


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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