In a message dated 01/05/2010 02:41:02 GMT Daylight Time,
dan...@verizon.net writes:
paul swed wrote:
Just picked up 2 units at a flea market today.
Would like to fire them up without smoke. :-)
Would appreciate schematics if the are out there.
My search so far is 0
Thanks
Paul,
PS
The antenna schematics and photos are on TVB's site as Dan suggested
_http://www.leapsecond.com/museum/10509a/_
(http://www.leapsecond.com/museum/10509a/)
These are much better quality than those in the HP manual so well worth
getting both.
regards
Nigel
GM8PZR
In a
Hi
I suspect they will pretty much do the same with the rest of the system. If
anybody wants one last look at their favorite transmitting site, now's the
time to do it. It would be nice if NIST took over one of the east coast sites
for a VLF station, but I see motion in that direction.
Bob
Thank you for the replies and help.
Regards
On Sat, May 1, 2010 at 6:20 AM, gandal...@aol.com wrote:
PS
The antenna schematics and photos are on TVB's site as Dan suggested
_http://www.leapsecond.com/museum/10509a/_
(http://www.leapsecond.com/museum/10509a/)
These are much better
Have you tried Dave at Artek Media?
A couple of things on the 117A:
The antenna is a roughly 1 meter diameter loop, but has a very frequency
selective pre-amp built in. Early versions used two Nuvistors and a 60 KHz
mechanical filter. Later versions used FETs I think. The amp in the unit
also
I'd like to build a GPS disciplined frequency standard.
I am slowly gathering up pieces.
I have a Trimble Resolution T GPS card that appears to work,
and an antenna for it.
I'm thinking now of the oscillator part.
I have two Racal 1992 counters with the stable oscillator option
(probably
Hi Chris,The Racal high stability units usually use the 9420 series OCXO's.
These are good oscillators but do not have electronic tuning as standard. 'they
are also normally 5MHz. What is the best oscillaor depends on
your requirements. The two main parameters are phase noise and hold-over
If there is no electronic tuning available one can use a DDS based
synthesiser to produce a corrected output frequency.
However close in spurs will be problematic unless one use a couple of
simple mix and divide stages or resorts to a Diophantine synthesiser
using phase noise truncation spur
Hi
A lot depends on what sort of result you are looking for.
If a simple calibration of the standard in your counter to +/- 1 ppb is your
goal, then a reasonable oscilloscope and some patience will get the job done
with what you already have.
If continuos lock to GPS at a 10X or 100X
