Hi
Keep in mind that the OCXO is likely (if it’s a modern part) optimized for TC
at it’s normal thermal gain. The gain and set point are adjusted for a flat
curve. If you bump either the gain or the set point you rotate the curve.
Bob
On Aug 24, 2014, at 8:36 PM, ewkeh...@aol.com wrote:
> Cha
Bert wrote:
As I said before am waiting for the small spheres and will see what happens.
Monitor carefully, as I suspect the spheres will pack too tightly
leaving too little airspace. You could easily burn down an OCXO if
this proves to be the case and the oven control loop goes
unstable.
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, ewkeh..
Charles
I use double bobble pack inside the Alu channel and I always start out by
monitoring the OCXO and make sure it is at least 10 C below the spec range.
The tbolt is center located and I use a combination of rubber mounts but
suspended that they sell for hard drives and squares of double
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
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 Aug
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 / shou
I compared an Austron 1250A to an FTS 1050A, both 5 MHz quartz frequency
standards. I beat both against a 5Hz offset using a Riley DMTD device to
provide a 1e6 time resolution increase. There was about a 1.15e-10
frequency difference between the two oscillators (two weeks on, it's
about 5.6s-1
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 the
Charles
I agree with every thing you wrote and I am implementing many of your
recommendations. Forty years ago I bought a 15 foot Alu channel to make small
frequency counter housings, always small, and at the time I did have access
to a machine shop so I made end plates. Still have five foot
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 al
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 a
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 understa
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