[time-nuts] Timing performance of servers

lists at lazygranch.com lists at lazygranch.com
Thu Oct 25 15:40:27 EDT 2012


The 20 degree cutoff is what I recall the starloc uses as a default. Now I don't know how important it is to filter those out by the response pattern of the antenna versus by software.  

-----Original Message-----
From: "Rob Kimberley" <robkimberley at btinternet.com>
Sender: time-nuts-bounces at febo.com
Date: Thu, 25 Oct 2012 20:24:58 
To: 'Discussion of precise time and frequency measurement'<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Timing performance of servers

We used to filter out anything 10 - 20 degs above the horizon when setting
up timing receivers. Typically there's a lot of noise down low (multipath
and tropo effects). As long as you've got plenty of SVs you don't need to go
way down to the horizon.

Rob Kimberley

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Chris Albertson
Sent: 25 October 2012 20:09
To: lists at lazygranch.com; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] Timing performance of servers

On Thu, Oct 25, 2012 at 11:02 AM,  <lists at lazygranch.com> wrote:
> The GPS seeing the horizon isn't required. Those satellites are filtered
out by software.

OK, technically it needs to see down to within 10 degrees of the
horizon.   But when you are choosing a location for the mast to the
horizon or withing 10 degrees of it looks pretty much the same.   I
don't want a huge tree of building due south of the antenna.  But for
timing all you really need is to see "most" of the sky.   It depends
on if you want it to work or work as well as it can.


Chris Albertson
Redondo Beach, California

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