[time-nuts] What position is measured?

[jmfranke]

Exactly, well put.

John  WA4WDL

--------------------------------------------------
From: "Mark J. Blair" <nf6x at nf6x.net>
Sent: Tuesday, September 07, 2010 12:24 PM
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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