[time-nuts] Z3815A Internal SMA 10Mhz Output

GandalfG8 at aol.com GandalfG8 at aol.com
Tue Aug 21 11:22:58 EDT 2012


Hi Adrian
 
Yes, I decided that too and may well try it sometime,  although it's quite 
well down the "to do" pile right now, and it's even made  slightly easier as 
it's already divided down internally to  2.048MHz:-)
 
Ironically, when I bought the Trak unit I already had a 2.048MHz master  
oscillator system using two ovened crystal oscillators in an auto switchover  
arrangement, plus the distribution amplifier to match, and I've never found 
very  much use for those either:-)
 
Regards
 
Nigel
GM8PZR
 
 
 
In a message dated 21/08/2012 15:12:07 GMT Daylight Time, rfnuts at arcor.de  
writes:

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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