[time-nuts] Lady Heather numbers

[Garren Davis]

>From looking at the graph over 24 hours it looks like the outer oven varies about +-.5C. This is
from the tbolt temperature sensor as the tbolt is in the outer oven. The inner oven where the
oscillator is located holds at 66.4C. My concern is that it looks like the tbolt algorithm controls
the DAC voltage depending on the temperature that the tbolt reads. Temperature goes up, the DAC
voltage goes up. If the inner oven is holding steady then I don't want the DAC voltage changing
if the temperature in the outer oven is changing. Is there any way to tell the tbolt algorithm to
ignore the temperature in its DAC calculation?

Wow, I hope this makes sense the way I explained it.

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 6:22 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers

Hi

The unit should not be overly sensitive to temperature. I'd guess that your improvised oven isn't holding temperature very well. The original likely held things to within < 0.1 C at some target in the 85 to 110C range.

Bob

On Feb 25, 2013, at 7:39 PM, Garren Davis <garren.davis at qlogic.com> wrote:

>
> The antenna has a pretty clear view of the sky. I notice that whenever
> a satellite drops out it causes the oscillator white trace and the DAC
> green trace to jump around. I wonder why that happens when there are 6 other good satellites.
>
> I can go back in time by using the down arrow and I see that it was
> pretty steady overnight until the furnace turned on to heat up the house. It's amazing how sensitive it is.
>
> Garren
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]
> On Behalf Of J. L. Trantham
> Sent: Monday, February 25, 2013 4:28 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Lady Heather numbers
>
> OK.  Found the problem.  Google Earth defaults to 'East' not 'West'.  Forgot to tell it North/South, East/West.
>
> Looks like your antenna is near the apex of your roof.
>
> The 17 minute span of the picture limits the ability to make a 'long term'
> assessment.  However, looks reasonable compared to mine in NW Florida except the temps seem a bit higher.
>
> Joe
>
> -----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 5:50 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Lady Heather numbers
>
>
> 33 north, 117 west. I am in southern California.
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]
> On Behalf Of J. L. Trantham
> Sent: Monday, February 25, 2013 3:44 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Lady Heather numbers
>
> If I am not mistaken (and I could be), the Lat/Long suggests that you are in China.  Is that correct?
>
> Joe
>
> -----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 11:00 AM
> 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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