Re: LF: W4DEX at 8270 Hz

[Paul Nicholson <vlf0403@abelian.org>]

W4DEX beginning to show up on my spectrogram

 http://abelian.org/vlf/fbins.shtml#b=100&s=sp

peaking at azimuth 100/280 which is correct.

Couldn't have come at a better time.  It looks a lot
better on the mod 360 version which I'm testing at
the moment.

S/N distinctly better on the new E-field rx compared
with the loops.  I've got to crack on with the H upgrade
and I've made a start on the design changes.  For example
a change of input transformer ratio drops the system noise
another dB by giving the LT1028 a source impedance closer
to its optimum for noise figure.  The response is extended
to include 137 kHz too.  I'm going to use the same filter,
PSU, and line driver as the new E-field so no designing or
testing to do there.

--
Paul Nicholson
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