Isn't the temperature inside the OCXO oven held at a set point (greater than
ambient) with it own independent thermostat? The DS1620 thermometer only
reads ambient temperature. In this case amibent means inside the Tbolt
enclosure.
If so, what does the Lady Heather "t t" command do? It pr
Instead of reacting to a change in the OCXO, the control software can be
proactive wrt a change that is heading towards the inside of the oven.
--
Björn
> What is the purpose of the temperature sensor chip on the PCB, anyway?
> Isn't the temperature inside the OCXO much more important?
>
> -
What is the purpose of the temperature sensor chip on the PCB, anyway? Isn't
the temperature inside the OCXO much more important?
--
Mark J. Blair, NF6X
Web page: http://www.nf6x.net/
GnuPG public key available from my web page.
___
time-nuts ma
Long term stability is pretty much totally irrelevant for Tbolts. What is
important is resolution of the temperature readings. The Tbolt responds much
more to changes in temperature, not absolute temperature.
Since few of us have an oil bath to chec
Greetings,
I have posted two plots graciously provided for me by Lady Heather,
showing strange behavior in my recently acquired Thunderbolt. It has
been powered continuously for the last two weeks.
The plots can be seen at: http://www.ni6e.com/TBolt/
An explanation for the abrupt change in
Hi
Based only on the fact that they never fixed the problem with the chip - I
don't think they do a lot of fine grain temperature correction. They certainly
went on shipping the units as spec compliant.
Bob
On Sep 27, 2010, at 10:20 PM, Hal Murray wrote:
>
>> Bottom line appears to be - f
> Bottom line appears to be - fine for day to day checks. I would not trust
> any of these chips to be long term stable to sub 10 mK levels.
I think the temperature correction is only used in holdover.
What's the time constant on learning the temperature profile of the OCXO? As
long as the agi
Hi
Since few of us have an oil bath to check the thermometer chips with, it's
tough to really know what the long term stability is. Those of us that do have
sufficiently precise oil baths are a bit reluctant to dunk a TBolt in them on a
regular basis
Bottom line appears to be - fine for da
Hello,
For anyone who has been following my questions, my palisade issues seem
to have been corrected now.
Just had to make a bit of a patch to the refclock_palisade.c driver, and
send a character to the device, for hardware polling..
We suspect that perhaps my RS422 to RS232 adaptors might not
Great suggestion! I bought two of the Symmetricom 58535A's from Mike Feher.
It'll be great only having to deal with *one* antenna and feedline plus I'll
have a spare antenna (and a spare splitter - for now)! :) Now... lots of
adapters and patch cables to buy (N to F)...
I've also bought fou
Home depot here in Canada sells a three way (one input, three outputs)
satellite
TV splitter with power pass thru on one port only. This works okay with my
Thunderbolt and Rockwell Jupiter based GPSDO, with the un used port terminated
with a 75 ohm load. I did notice that when I powered th
I am using one of the MCL-ZAPD-3DB units I bought new on Ebay
and it was easy to change the input antenna connector from an “N”
to the “TNC” connector that I needed, eliminating an adaptor and
probably a little loss. One of the outputs from the ZAPD is
connected to a 40-2400MHz 4–way splitter (
Hello Time-Nuts,
Check out ebay auction 360303616823 for one of the Minicircuits antenna
splitters. These units are pulls from telco equipment and will feed power
from both/either side. I haven't hooked up a DC block (to protect the
signal generator) so haven't measured the gain through the
Hi
The HP splitters I have torn into have a few nice features:
1) They have built in RF bandpass filtering on a per output basis. No
re-circulating RFI. Better protection for the GPS receiver input.
2) They will pass DC from one port and correctly DC terminate the other
ports (no antenna missing
Brooke -
The data can be found on the Symmetricom site. Connectors are N. 73 - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Brooke Clarke
Sent: Monday, Septe
Hi Mike:
Can you tell me about features of the 58535A?
Connector type, DC pass through, photo?
Total to zip 95482?
Have Fun,
Brooke Clarke
http://www.PRC68.com
Mike Feher wrote:
I still have some of the Symmetricom 58535A GPS splitters/amplifiers.
Details:
1 58535A $35 plus $ 4.95 priority
Last time I checked, the HP/Symmetricom HP58532A GPS antenna was cheaper than a
GPS splitter (I paid $50 for my HP58532A, with shipping, and it was brand new).
Of course, with two antennas, you will need two feed lines which, depending how
long they are, could cost you more than the antenna itse
I still have some of the Symmetricom 58535A GPS splitters/amplifiers.
Details:
1 58535A $35 plus $ 4.95 priority flat rate shipping
2 58535A $65 plus $ 4.95 priority flat rate shipping
4 58535A $120 plus $10.70 priority flat rate shipping
These are new in original packing.
PayPal to my email p
Rather than put up two antennas, why not use one, and pick up a HP/Symmetricom
GPS splitter? (Mini-Circuits makes a similar unit). You can find them on eBay
for various prices. The Symmetricom one, the 58535A, supports 2 GPS receivers.
It has a built-in amplifier and filters, so it provides high
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