[time-nuts] Question on LH
David C. Partridge
david.partridge at perdrix.co.uk
Wed Dec 7 15:02:17 EST 2016
So need to do two long surveys then - what a pain ...
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Chris Caudle
Sent: 07 December 2016 19:54
To: time-nuts at febo.com
Subject: Re: [time-nuts] Question on LH
On Wed, December 7, 2016 12:51 pm, David C. Partridge wrote:
> But in any case at the end of the LH 48 hr survey, the survey location
> will be stored into the currently connected TB. If both TBs are
> connected to the same antenna, I think you'll need manually to set the
> location of the second one (lat./long./altitude) based on the survey
> results stored in the other one.
Mark has explained previously on the list, but it is actually kind of convoluted. The command to set the position does not accept enough numeric precision to accurately set the position which was determined from long term averaging, so LH causes the Thunderbolt to run short self surveys (which report the position to more numeric digits than the set command will allow you to set), and compares the reported position to the position derived from the long term average. When one of the self survey results just happens to be within some small error of the determined position, then that self survey result is saved.
So if you manually set the position on a second Thunderbolt, the software will chop off the lower order digits of the number you give, and the two thunderbolts could have very slightly different performance, even running from the same antenna.
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