Re: LF: Re[2]: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2

[Paul Nicholson <vlf0403@abelian.org>]

I have used the Trimble Thunderbolt with its fixed
10uS pulse.  It worked (vlfrx-tools, M-Audio 192) but
timing jitter improved after a pulse stretcher increased
the width to 1mS.  As Andy says, the 10uS pulse energy
was a bit low giving poor S/N and a jittery centroid of
the smoothed pulse.

Now I use a Ublox for timing VLF reception and this works
fine.  The Thunderbolt is used for calibration and as a
reference for comparing my growing collection of GPSDOs.

I'll be interested to see Wolf's comparison of edge
and centroid timing.  I've never had any luck with
edge timing.

--
Paul Nicholson
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