All Trimble OCXOs may work in a Thunderbolt, but not all are drop-in
replacements.
The one I got was much thicker than the original dead part, and the
polarity of the
control signal is inverted. I got it working but it won't fit in the
original enclosure.
On 02/25/2013 04:12 PM, Bob Camp wrote:
Hi
Keep in mind that the top label on the OCXO shows the order number for the part, not it's
part number. Anything you find at auction that's labeled "Trimble OCXO"
probably will work with the TBolt.
Bob
On Feb 25, 2013, at 6:47 PM, Garren Davis <[email protected]> wrote:
That makes sense. My inner oven is about 65C. I raised it to that just to get
the DAC voltage
close to 0v. I can raise it some more to get it between .1 and .9v.
I started to look for OCXO's but couldn't find one with the same part number as
mine. Mine
is 37265 and the others I found did not look like they had the same pinout.
Does the tbolt
accommodate other model OCXO's? It looks like the circuit board has extra
through holes and
I always wondered if it was for different OCXO models.
Anyways I wanted to see if my homebuilt oven could match a commercial product.
It was built
from a 73 Amateur Radio magazine article over 10 years ago.
Garren
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Bob Camp
Sent: Monday, February 25, 2013 2:11 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Lady Heather numbers
Hi
A "typical" TBolt OCXO will settle out with a control voltage that's slightly
positive (maybe 0.1 to 0.9V) rather than negative 0.7.
Since the TBolt is rated to +70C, it's a good bet that the oven in the OCXO is
running above 85C. Once things stabilize, you may want to bump your oven
temperature up and see what it does to the frequency.
Of course with TBolt OCXO's selling at auction for $20 you may or may not want
to go to far with this.
Bob
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Garren Davis
Sent: Monday, February 25, 2013 12:59 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers
Thanks. I worry a little bit because my setup is not the normal thunderbolt
running on the shelf or a rack. The oven for my oscillator is broken so I
removed it from the circuit board and put it in a double oven with proportional
controller that I built for a long ago project.
The thunderbolt is in the outer oven running about 45C and the oscillator is in
the inner oven running about 65C. The temperature rise on the display is
probably the furnace in the house turning on this morning. I notice that the
DAC voltage also rises and falls with the temperature change and wonder if that
affects the oscillator in the inner oven.
I'll let it run for the rest of the week and see what happens.
Garren
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Bob Camp
Sent: Monday, February 25, 2013 9:35 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Lady Heather numbers
Hi
Based on a very short display time, nothing looks seriously broken. I'd suggest
running the OCXO calibration routine at some point. Everything is still warming
up / settling out for the first week or two, so who knows where it will finish
out at.
Bob
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Garren Davis
Sent: Monday, February 25, 2013 12:00 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Lady Heather numbers
Hi,
I have been playing with my thunderbolt and Lady Heather over the weekend. I
hope it's ok that I attached a screen dump of what I have. Can anyone comment
on the picture. It's been running less than a day and I don't know if what I
have would be considered good as far as accuracy and stability is concerned.
Thanks.
Garren
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