John-
If I divided this down to 1 PPS, would it be a better timing reference
than the GPS receiver?
The best idea is to use the 1 PPS to discipline (phase lock) the 10MHz OXCO
in your counter.
A couple starting points for homebrew solutions:
Brooks Shera's circuit
The timing accuracy is ± 100 nanosecond (1 sigma) and is available
only when valid position fixes are being reported. Repeatability
checks of 10 sets of 100 one second samples taken
over a period of 20 minutes showed an average variation of
approximately 100 nanoseconds (not allowing for SA).
Neon John wrote:
Next question. I have a 70s vintage HP ovenized 10 mhz frequency
standard like the one that they sold as an OEM item and as used in
some counters. It's in the oversized metal relay can. I'd have to
open the case to get the model number but I do recall the -01 option,
high
At 6:11 AM -0800 1/18/06, Tom Van Baak wrote:
Next, I really want one of David Forbes' CRT clocks! I sent Dave an
email asking if he's planning on making any more but I haven't heard
back. (you lurking here, Dave?) Anyone have one in good condition
he'd like to part with? Prefer the
On Wed, 18 Jan 2006 00:03:37 -0800, Christopher Hoover
[EMAIL PROTECTED] wrote:
John-
If I divided this down to 1 PPS, would it be a better timing reference
than the GPS receiver?
The best idea is to use the 1 PPS to discipline (phase lock) the 10MHz OXCO
in your counter.
A couple starting
On Wed, Jan 18, 2006 at 09:17:31AM -0700, David Forbes wrote:
Our need for accurate time/frequency is:
1) Local oscillator frequency +/-1kHz at several hundred GigaHertz;
2) Time correct to +/-10 milliseconds to keep the telescope pointed correctly.
I suppose it would make a lot more sense
On Wed, 18 Jan 2006 09:19:03 -0700, David Forbes
[EMAIL PROTECTED] wrote:
At 6:11 AM -0800 1/18/06, Tom Van Baak wrote:
Next, I really want one of David Forbes' CRT clocks! I sent Dave an
email asking if he's planning on making any more but I haven't heard
back. (you lurking here, Dave?)
John
You might also look at http://www.qsl.net/zl1bpu/PRECISION/Reference1.htm
Peter
ZL2AYX
On Wed, 18 Jan 2006 11:27:31 -0500, Neon John [EMAIL PROTECTED] wrote:
On Wed, 18 Jan 2006 00:03:37 -0800, Christopher Hoover
[EMAIL PROTECTED] wrote:
John-
If I divided this down to 1 PPS, would it
In message [EMAIL PROTECTED], David Forbes writes:
At 6:43 AM -0800 1/18/06, James Maynard wrote:
I suppose it would make a lot more sense to run the GPS 1PPS into the
Rb source so that it will discipline itself, and the phase error be
monitored to make sure it stays at zero.
Am I barking up
Poul,
Thanks for the informative reply. I guess the short answer is that we
should use a very clean long-term GPS trend record to correct the
PRS10 rather than the 1PPS from the GPS unit, which has horrible
short-term stability.
I believe that Tom VB mentioned once that a daily update to the
Hi,
You should definately ask the VLBI people how to deal with the maser.
You definately don't want to touch the frequency reference during an
observation. They really do need the 10^-15 short-term stability. They
can solve for pretty substantial frequency offsets (and linear drifts)
after the
Tom Van Baak wrote:
I should be able to improve the receiver performance some by ovenizing
it. I wonder if it would be worth the effort?
You can check this with a hair dryer. Measure the effect
of a 10 C rise and then extrapolate back to 0.1 or 0.01C
to see what the result of making
I have recently been involved with VLBI observations between NZ and
Australia. We used the SRS FS725 as our Freq. standard here in NZ. We
can not afford a Hydrogen Maser as yet! The FS725 uses the PRS 10 Rb
package but adds interface electronics that amongst other things adds
the ability to
This is an interesting discussion and aimed directly at my homebrew efforts.
How about using the PRS10 in time stamping mode where you feed it
the 1 PPS from the GPS and use a uC to read back the time stamp
and the GPS saw tooth to get the actual delta time? It would be
easy to record these
In message [EMAIL PROTECTED], Brooke Clarke writes:
HI Poul:
That's very interesting. How about using the PRS10 in time stamping
mode where you feed it the 1 PPS from the GPS and use a uC to read back
the time stamp and the GPS saw tooth to get the actual delta time? It
would be easy to
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