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Re: VLF: W4DEX in Europe at 8820 Hz

To: [email protected]
Subject: Re: VLF: W4DEX in Europe at 8820 Hz
From: Paul Nicholson <[email protected]>
Date: Tue, 02 Dec 2014 18:20:07 +0000
Cc: Markus Vester <[email protected]>, [email protected], [email protected], [email protected]
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References: <[email protected]> <[email protected]>
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Markus wrote:

> I'm tempted to call that a TA first for Dex and Wolf,

Indeed it is tempting.  With that 50.5 uHz spectrum the odds
of a false peak is probably one in a few tens of thousands.

Perhaps Dex should change frequency a small amount before
tonight's transmission.

Dex wrote:
> I have about optimized the matching transformer winding
> and was able to get about 20% more antenna current.

The extra 1.5 dB is a good step in the right direction.
The ERP increase should be clear on Mike Smith's receiver
at Forest VA.   I restarted the regular Forest spectrum at

Mike's receiver is very stable and low noise and uses a fibre
optical link for isolation.  It also has a first rate GPS
timing system.  This is the rx for European txs to shoot for.
You can listen to it on the vlf35 stream at

> I could start at 1800 ...

I don't think I can use the signal so early in the evening.
Signal will be there, but there is so much phase change between
18:00 and 23:00.   I should think 22:00 would be a good start
time for T/A.  No way to predict how the noise will be tonight.


and step back over a few days to see the variation in south-west
noise from one night to another.

Wolf wrote:

> In fact 'VLF6' is rather noisy,

It is a first rate natural radio receiver and picks up more
whistlers than all the other sites put together.  Its UHF down-
link causes some compression but I guess that doesn't show after
the sferic blanking.   Link noise floor never seems to be a problem.

My own 'new' E-field receiver performed dismally last night, but
thanks to the signal from Dex I think I know where the problem
is now.  Maybe I can fix it this evening...

Paul Nicholson

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