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Re: LF: NA VLF

To: [email protected]
Subject: Re: LF: NA VLF
From: [email protected]
Date: Sat, 13 May 2017 11:34:45 -0230 (NDT)
In-reply-to: <[email protected]>
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Hi Paul,

Thanks for the report.

On Sat, 13 May 2017, Paul Nicholson wrote:

The signal overnight 11th/12th reached about 0.085 fT,
the best signal strength so far.  Was that due to
the increased ERP or propagation.   The noise was high
that night too.
Probably conditions.  The aerial current had not increased
until yesterday afternoon.

Overnight 12th/13th I cannot see the signal in my usual
6 hour integration.   A bit of a spike at 8270.008435
but that's not a frequency your divider would allow.
Last night the wire acquired a layer of ice and the current
dropped by a factor of 5. Tuning brought it back to 0.24A.
(The ammeter was recalibrated yesterday; it had been reading
a bit high.)

I've been looking at the signal at Forest.  The peak is
visible on the first two nights but not since (or before).
It is also visible in the raw recording at the receiver site.
But the frequency is different.  After a careful look at it,
the spectrum is peaking at close to 8270.007 + 20 uHz, on
both nights.  This doesn't agree with the frequency measured
at Todmorden, which started out around +46 uHz and settled
by the next night at +93 uHz.

Because of this frequency offset, we must for now discount
the detection at Forest.  Hopefully we will get it back
with a boost to ERP.

Thanks for this update. The aerial has nul towards the west on 2200 and
630 metres and so the Forest reception report was even more of a surprise
that your TA receptions.  A bit disappointing but motivating. The
tower on the far end of the big rotated 'L' is now on the way up. It was
was a victim of 100mph winds this past winter.  When its up again, the
big RL will yield several more dB without the nul if its VLF behaviour is similar to that on MF and LF.
73
Joe VO1NA

--
Paul Nicholson
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