On Sat, 23 Aug 2014 16:51:06 -0500, Dave M wrote:
Thanks for that suggestion, Ed. After a bit of reading in the X72
Reference Guide, it appears that the X72 does have a 1PPS input. That
would be considerably easier than trying to interface the Rb into the
GPSDO. Still trying to understand
Hal there is not one straight answer, as mentioned before these units are
intended for commercial applications with large temperature ranges. Most
have added frequency compensation using heater current sensing for C field
adjustment or in the case of the FE 5680A DDS control. Looking close
Hi
The typical small Rb’s are temperature compensated. They have a real tempco of
a bit less than a ppb. It gets corrected to about 10X better than that using
data from an internal temp sensor. Correction is often three point, so it may
or may not track the actual performance of the unit at
Hi Bob:
I think that's what's done in the SRS PRS10
http://www.prc68.com/I/PRS10.shtml
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Bob Camp wrote:
Hi
If you lock an Rb to GPS, you need / want /
Hi
It is not what is done in the Efratom Rb’s. Their pps input is set up to get
things on frequency / on time quickly. The assumption is that you plug it into
a pps to get it “right” and then take off on your mission. That takes them into
the short (for a Rb) time constant region.
Bob
On
Bob which Efratom are you talking about?
Bert
In a message dated 8/24/2014 6:33:12 P.M. Eastern Daylight Time,
kb...@n1k.org writes:
Hi
It is not what is done in the Efratom Rb’s. Their pps input is set up to
get things on frequency / on time quickly. The assumption is that you plug
it
Hi
The Efratom that the original poster was referring to. All of the Efratom’s
with PPS in pretty much work the same way. It’s one of those options you go
crazy trying to find an example of and when you do it’s “ho hum, let’s look for
something else”.
Bob
On Aug 24, 2014, at 8:19 PM,
Thanks for that suggestion, Ed. After a bit of reading in the X72 Reference
Guide, it appears that the X72 does have a 1PPS input. That would be
considerably easier than trying to interface the Rb into the GPSDO. Still
trying to understand what the manual is telling me. Next thing is to
Hi Dave,
On 8/23/2014 3:51 PM, Dave M wrote:
Thanks for that suggestion, Ed. After a bit of reading in the X72
Reference Guide, it appears that the X72 does have a 1PPS input. That
would be considerably easier than trying to interface the Rb into the
GPSDO. Still trying to understand what
Hi
If you lock an Rb to GPS, you need / want / should do it with a *very* long
time constant. Numbers in the one day to several days range are commonly seen.
If you lock it up with a tighter (shorter time constant) loop, it will just
wander around as it follows the GPS input. That’s what would
kb...@n1k.org said:
If you have a temperature stable environment (or create one) you can get
some very good results with an (good) Rb locked to a (good) GPS via a proper
long time constant setup. Its not easy, but it can be done.
What's the temperature sensitivity of the typical
actually if the oscillator is stabil enough, with a very long time
constant one could kill the phase modulation of the new WWVB format
73
Alex
On 8/23/2014 6:27 PM, Bob Camp wrote:
Hi
If you lock an Rb to GPS, you need / want / should do it with a *very* long
time constant. Numbers in
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