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Date: Sun, 2 Mar 2014 01:22:15 -0500
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Subject: RE: LF: Re: U.S. VLF License WH2XBA
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Paul,

Great data as always.

I don't know the to-from polarity of your phase measurement; but:
the slope of phase change and the slope inflection point at 04:30 look
generally consistent with what they would be for this path length over
land/water in March*. Do you happen to have March parameters for LWPC?
(shape of diurnal phase characteristic varies quite a bit month-by-month for
this path length)

Asking this as a an additional means of confirmation, if needed.

In that context, did the signal appear at or near Bob's switch-on time?

 * (Davies pg 383 for example; but your LWPC phase results with March
parameters would be more representative than my extrapolation from Davies)

Jim AA5BW


-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Paul Nicholson
Sent: Sunday, March 2, 2014 1:09 AM
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: U.S. VLF License WH2XBA


 > Here's what he's sending ... http://www.w1vd.com/grabber.html

Thanks Jay.

Later I will make a spectrogram (the signal is recorded) but I don't think I
will be able to resolve the Morse.

I am happy that the tx preserves carrier phase in between dots otherwise it
would not be possible to do long integration.

The carrier stability is excellent and the little apparent error in the
frequency can be blamed on the path length varying
during the night.   tx must be using rubidium or GPS.

Signal level should drop soon as dawn arrives here in UK and we may see the
phase lead increase as the path shortens for the daytime ionosphere.

  2014-03-02_05:15:00  0.14 fT   12.3 deg
  2014-03-02_05:30:00  0.15 fT   13.1 deg
  2014-03-02_05:45:00  0.12 fT    3.2 deg

--
Paul Nicholson
--