[time-nuts] Lady Heather numbers

[Bob Camp]

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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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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This message and any attached documents contain information from QLogic
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