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Date: Wed, 13 Sep 2006 09:48:02 +0200
To: rsgb_lf_group@blacksheep.org
From: Rik Strobbe <rik.strobbe@fys.kuleuven.be>
In-Reply-To: <009e01c6d6ce$c7e7c4a0$8fce28c3@captbrian>
References: <NKEMLGOEKANPNJOBFBAFGECOCPAA.g4wgt@tiscali.co.uk>
 <005d01c6d5d8$af2493e0$721686d4@captbrian>
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Subject: Re: LF: Re: Re: RE: Strange detector
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Status: O

I guess that's because the ERP is far field power while the "stolen power" 
(via the HF antenna) comes from the near field energy power.
Or otherwise: the 4 Watt is not radiated from the LF-antenna to the 
HF-antenna but capacitive coupled.

73, Rik  ON7YD - OR7T

At 01:51 13/09/2006 +0100, you wrote:
>what puzzles me is that you can energise a bulb   [300 ma x 12.6volts?] at
>nearly 4 watts with an ERP of less than 1 watt...........;-))
>
>G3GVB
>
>
>----- Original Message -----
>From: "captbrian" <captbrian@ukonline.co.uk>
>To: <rsgb_lf_group@blacksheep.org>
>Sent: 11 September 2006 20:30
>Subject: LF: Re: RE: Strange detector
>
>
> > You have been lucky so far. I would disconnect  HF antenna pdq before
> > LF-ing.
> >
> > Bryan
> > ----- Original Message -----
> > From: "Gary - G4WGT" <g4wgt@tiscali.co.uk>
> > To: <rsgb_lf_group@blacksheep.org>
> > Sent: 11 September 2006 13:49
> > Subject: LF: RE: Strange detector
> >
> >
> > > Hi J & LF,
> > >
> > > I have a Yaesu FT-747GX & when I Tx LF I see a light shining out of the
> > back
> > > slots onto the wall from the Rx antenna fuse bulb. Yes the bulb is lit
>to
> > > full brilliance, the operation FT-747GX doesn't appear to have been
> > > effected. LF RF is being picked up on the HF antenna.
> > >
> > > 73
> > >
> > > Gary - G4WGT.
> > >
> > > -----Original Message-----
> > > From: owner-rsgb_lf_group@blacksheep.org
> > > [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of J. Allen
> > > Sent: 11 September 2006 05:38
> > > To: LF (RSGB); LowFER at LW Cafe
> > > Subject: LF: Strange detector
> > >
> > >
> > > Haloo Group,
> > >
> > > I wonder how many here have similar oddities to share....
> > >
> > > Another part of my hobby is contesting... I have a RAT PAK remote
>antenna
> > > switch which mounts on the tower which is used for LF.  The RAT PAK
> > although
> > > not in use on LF has a set of six LEDs to indicate which antenna has
>been
> > > selected in the shack during HF operation.
> > >
> > > This is where the odd indication comes in.  Whenever the LF transmitter
> > > keys, all six LEDs glow softly and the brilliance of the LEDs increase
> > with
> > > the power level.  It makes a nice indicator that the beacon is working
>and
> > > putting out reasonable power.  The first time I keyed down with more
>than
> > 50
> > > watts, it was quite a surprise.  150 Watts glow at what looks like 1/10
>of
> > > brilliance.
> > >
> > > Now lets calculate... if 400 watts turns out to really be 1 W ierp here,
> > > full brilliance would mean how many dB above legal limit?   :o)
> > >
> > > J.
> > >
> > >
> > >
> > >
> >
> >
> >


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