[time-nuts] Different Survey Results

Bob Camp lists at rtty.us
Thu Aug 19 23:55:26 UTC 2010


Hi

To get to "auto calibrate" hit a & and then it's the "A" option (Autotune 
rather than auto calibrate).

Sorry for the confusion.

Bob

--------------------------------------------------
From: "Bob Camp" <lists at rtty.us>
Sent: Thursday, August 19, 2010 5:10 PM
To: "'Discussion of precise time and frequency measurement'" 
<time-nuts at febo.com>
Subject: Re: [time-nuts] Different Survey Results

> Hi
>
> A few other things to try / consider:
>
> 1) Hit the "auto calibrate" function in LH to calibrate the slope of the
> OCXO, it will also load some damping and time constant stuff that you may
> want to overwrite. I don't know if this is a "beta only" feature or not.
>
> 2) Make sure that the TBolt isn't getting hit with drafts. Something as
> simple as a shoe box over it can help things quite a bit.
>
> 3) The +12 supply is fairly critical. Good regulation and low noise help
> stability
>
> 4) Clear view of the sky to the south (northern hemisphere) or north
> (southern hemisphere) helps the antenna a lot. Higher is usually better 
> for
> GPS antennas.
>
> 5) The OCXO will run quite a bit better after it's been on for a while. 
> How
> long depends on the one you have and how long it's been off. A few days to 
> a
> few weeks may be involved.
>
> 6) Monitoring what's going on with long term charts on LH is very useful 
> to
> diagnose specific issues.
>
> Lots of things to play with. None of it likely to cost much, other than 
> some
> of your time.
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Peter Krengel
> Sent: Thursday, August 19, 2010 12:29 PM
> To: time-nuts at febo.com
> Subject: [time-nuts] Different Survey Results
>
> Hello,
>
> I'm new to the list and to the themes at all. I'm running a V3 Thunderbolt
> using the great Lady Heather Software (thanks for this).
>
> Setting up the tbold for the first time I made a 48h survey.
> To compare the results I also started a SirF III GPS using VisualGPS
> software and after the 48h period I got totally different results.
>
> Knowing my real geografic coordinates very well I saw that the tbold
> obviously calculated wrong data.
>
> So my questions to the group are:
>
> 1. For getting best disciplining results out of the tbold: Do I better
>    put in the coordinates manualy or using the survey function?
>
> 2. Is it necessary to modify DAC and temperature settings using
>    command line options (or using the heather) or does tbold work best 
> with
>
>    factory settings?
>
> 3. Is there any "How to.." pdf or book on the net which comes with more
>    informations about the tbold experiences than the well known
>    official pdf from 2003 ?
>
>
> Thank you very much for help.
>
> 73 from germany
> Peter Krengel
> DG4EK
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