[time-nuts] Z3815A Internal SMA 10Mhz Output
GandalfG8 at aol.com
GandalfG8 at aol.com
Tue Aug 21 15:22:58 UTC 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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