-Original Message-
From: Robert Darlington
Sent: Tuesday, March 12, 2013 5:49 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Interesting looking crystal on ebay
I ended up buying this as I've wanted one for a while. It arrived today
and I swept it
On 11/03/13 13:29, Bob Camp wrote:
Hi
So all you have to do is figure out when the physics package is hot enough
for the line spreading to work well enough to get a lock...
Should not be too hard to monitor. Isn't oven temperature part of the
BITE fail condition?
Cheers,
Magnus
On 11/03/13 21:20, John Miles wrote:
With most modern lightweight Rb's the OCXO is integrated into the same
heater block as the physics package. That makes it a bit tough to heat one
without heating the other. .
On LPROs the OCXO sits on the opposite side of the board.
Pretty sure that's
Hi
I'm not sure that the cheap ones really report back the temperature as part of
the BITE. I suspect they report something more along the lines of oven is not
running all the time.
Bob
On Mar 12, 2013, at 6:41 AM, Magnus Danielson mag...@rubidium.dyndns.org
wrote:
On 11/03/13 13:29, Bob
On 12/03/13 12:03, Bob Camp wrote:
Hi
I'm not sure that the cheap ones really report back the temperature as part of the BITE.
I suspect they report something more along the lines of oven is not running all the
time.
I'm after sufficiently high here, as in lockable, and I wonder if not
the
Hi
Ok, so you have what may be anti-resonance about 23 ppm above 10 MHz. Exactly
what that works out to in a circuit depends a lot on the stray C in your
fixture.
The next step would be to look at ~ 3.333 MHz to see if it's a third overtone
crystal.
Bob
On Mar 12, 2013, at 1:49 AM, Robert
Hi
It's not just the hot enough to be lockable that you are after. You also are
after a condition where you can tell the difference between several
transitions. Locking to the wrong one isn't a good thing.
I suspect they do something like: wait for oven to cut back, then delay for xxx
On 10/03/13 20:30, Ed Breya wrote:
I recently acquired a junker Trimble 4000S GPS surveying unit. It's
mid-1980s technology, so very big, but nice to salvage various RF and
signal processing goodies from. I have no plan to get it working, and no
need for the function - it's just for
Hi
That looks a lot better. Your DAC has moved about 40 mV over the time
period. That's not bad, given what you did to it. The ~ 14 ppb shift should
settle out something much lower in a week or two.
Good numbers on the PPS are in the 2 to 3 ns RMS region. The oscillator
numbers are a best
Looking for a TAPR TADD-1 distribution amp. Thanks!
Paul, W9AC
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Garren Davis garren.davis at qlogic.com
Tue Mar 12 12:55:48 EDT 2013
I found the 1 ohm resistor from the 12 volt pin to the heater circuit
popped off its solder pads and was laying between the insulation
and the metal enclosure.
++
You might want to check the 2 photos and
I did see those photos. They gave me confidence to cut it open to see if there
was
anything I could do to fix it.
Garren
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Arthur Dent
Sent: Tuesday, March 12, 2013 2:16 PM
To:
Do you think that the oven is working correctly? Is the DC current high
on power-up then dropping to a steady lower value after warm-up time?
My concern is that the resistors may have unsoldered themselves because
the oven ran away into an over-temp condition.
On 3/12/2013 9:55 AM, Garren
Rex,
I checked the current on the oven. It seems to be operating correctly. My
theory is
that it worked before it was shipped. This was from the TAPR group buy. They
were all
tested before shipping. The resistor probably popped of during shipping. The
other
resistor popped off probably from
Hi
If the oven runs away, you won't get the nice DAC voltage settling to a
reasonable value trace on LH. If it has run away, the appearance is very
distinctive when you open it up. Boards turned brown and highly oxidized solder
….
Bob
On Mar 12, 2013, at 7:35 PM, Rex r...@sonic.net wrote:
Hi:
I've heard that there's a Russian satellite system that uses 150 400 MHz signals for timing based on Geosynchronous
satellites.
Maybe called Tsikada.
Does anyone know about it?
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Tsikada was (maybe still is?) the Russian version of TRANSIT - it used
150MHz and 400MHz carriers, but I'm pretty sure the orbits were (like
TRANSIT) low polar rather than Geosynchronous. You may also run into the
name Parus - which was the name of the system before it was released to
civilian
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