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Ranging..  Jim Lux jimlux at earthlink.net Mon Oct 10 19:05:38
UTC 2005  >Date: Mon, 10 Oct 2005 09:35:54 +0100 >From: "Dave
Baxter" <dave at emv.co.uk> >Subject: RE: [aprssig] Satellite
ranging >I read somewhere that it has been done, but with a
voice repeater on the >ground.  However, as I seem to recall,
it's not just the path delay that >you see, it's also the delay
in all the audio filtering in the box >(bird) and your own
radio's too.  I think the article I read, they were >trying to
confirm measurements from some other experiment, and had to
>calculate the path delay, to determine the "real" group delay
through >the repeater, or was it the other way round, I
forget... >No doubt you could do that with a satelite too, but
you'd need to know >in advance the delay through the bird's
circuits, and your radio's (at >least that is easy to do) come
to that!.  If that would be significant >over the extended
distance/path delay to/from a satelite th