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Date: Sat, 02 Dec 2017 15:39:52 +0100
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Content preview: Wow, very nice! Congrats to Dex for the nice signal. I hope
to receive him here one day. Unfortunately we still suffer from permanent
clouds and fog, so the tree is still not back yet :-/ 73, Stefan Am 02.12.2017
14:03, schrieb Paul Nicholson: > > Dex surprised me last night with a carrier
on 8540 Hz, > GPS-locked and the ERP would be circa 100uW. > > Tx was stable
from 21:25, detectable in the UK by 22:30, > and a good overnight signal
until 03:00 when Dex planned to > switch off. > > http://abelian.org/vlf/tmp/171202a.gif
> > Signal about 0.1fT and 30nV/m, about 30 electrons worth of > charge on
the new E-field antenna. Anything with double > figures is a good amateur
signal! > > H-field: -27.7 dB in 1Hz, phase -109.4 deg; > E-field: -26.0
dB in 1Hz, phase -108.1 deg; > > It's not unusual for the new E-field rx to
do better than the > loop rx. Looks like I need to hurry up with the upgrade
to > the H rx! I've cleared bench space for the replacement and > parts are
on order. > > I measured the bearing using three different methods: > > Watson-Watt
goniometry: 273.1 deg > > Poynting vector: 287.5 deg > > Tsuruda/Hayashi
NPE: 282.3 deg > > The great circle bearing is actually 284.6 deg. > > NPE
should be the most accurate method - no polarisation error > but relies on
precise relative phase measurements between the > three channels. > > --
> Paul Nicholson > -- > > [...]
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Subject: Re: LF: W4DEX at 8540 Hz in Todmorden
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Wow, very nice! Congrats to Dex for the nice signal.
I hope to receive him here one day. Unfortunately we still suffer from
permanent clouds and fog, so the tree is still not back yet :-/
73, Stefan
Am 02.12.2017 14:03, schrieb Paul Nicholson:
>
> Dex surprised me last night with a carrier on 8540 Hz,
> GPS-locked and the ERP would be circa 100uW.
>
> Tx was stable from 21:25, detectable in the UK by 22:30,
> and a good overnight signal until 03:00 when Dex planned to
> switch off.
>
> http://abelian.org/vlf/tmp/171202a.gif
>
> Signal about 0.1fT and 30nV/m, about 30 electrons worth of
> charge on the new E-field antenna. Anything with double
> figures is a good amateur signal!
>
> H-field: -27.7 dB in 1Hz, phase -109.4 deg;
> E-field: -26.0 dB in 1Hz, phase -108.1 deg;
>
> It's not unusual for the new E-field rx to do better than the
> loop rx. Looks like I need to hurry up with the upgrade to
> the H rx! I've cleared bench space for the replacement and
> parts are on order.
>
> I measured the bearing using three different methods:
>
> Watson-Watt goniometry: 273.1 deg
>
> Poynting vector: 287.5 deg
>
> Tsuruda/Hayashi NPE: 282.3 deg
>
> The great circle bearing is actually 284.6 deg.
>
> NPE should be the most accurate method - no polarisation error
> but relies on precise relative phase measurements between the
> three channels.
>
> --
> Paul Nicholson
> --
>
>