[time-nuts] What position is measured?
didier at cox.net
Tue Sep 7 17:14:00 UTC 2010
Sent from my BlackBerry Wireless thingy while I do other things...
From: "Mark J. Blair" <nf6x at nf6x.net>
Sender: time-nuts-bounces at febo.com
Date: Tue, 7 Sep 2010 09:24:53
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] What position is measured?
On Sep 7, 2010, at 6:30 AM, jimlux wrote:
> Another analogy is that if you had a machine that recorded all the signals, mounted right at the antenna, and then carried the recording half way around the world, and then ran the recording into a receiver, it would give you the position of the antenna, not the receiver. The cable is just a time delay.
Does this mean that while the antenna feedline cable length does not influence the measured position (at the phase center of the antenna), and it does not influence the accuracy of a disciplined frequency reference output, it does introduce an error into the absolute time output (i.e., adding a delay to the PPS output)?
In other words, do I correctly assume that I may safely ignore the length of my TBolt's antenna feedline if I am only interested in its 10 MHz OCXO output, but I may want to compensate for it if I ever find a need to use its PPS output as an absolute time marker?
Mark J. Blair, NF6X <nf6x at nf6x.net>
Web page: http://www.nf6x.net/
GnuPG public key available from my web page.
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