Hi Markus!
Thank you for your answer the explaination.
I switched down for 3mHz intentionally to be more apart from Ossi's
signal at 8970.03 and to compensate a little upward drifting....it's
getting colder outside and so in my garage.
73, tnx
OE3GHB
Gerhard
Am Sonntag, den 23.01.2011, 14:21 +0100 schrieb Markus Vester:
> Hi Gerhard,
>
> compared to the capacitive fields of the antenna at VLF, the building
> will anyway be nearly a short circuit to ground. Connecting the
> lightning protector will divert some of the current which would
> otherwise be going through the house, but the relative difference in
> the external E-field distribution will only be small.
>
> I have a similar situation with the LF TX antenna, which is about 10 m
> above the roof of our two-floor house. There is a vapour barrier made
> of thin aluminium sheets under the roof, and two of the strips can
> be accessed electrically. By connecting those to ground, about 15
> percent of the total antenna current could be collected, and this
> helped to significantly reduce the e-fields indoors, and also slightly
> the loss resistance.
>
> On your grabber, it looks like you have switched frequency from
> 8970.00 to 8969.97 sometime around 12:15 - was this a real step, or an
> artifact due to receiver samplerate correction?
>
> Best 73,
> Markus
>
>
>
> From: Gerhard Hickl
> Sent: Sunday, January 23, 2011 1:53 PM
> To: [email protected]
> Subject: RE: LF: Transmissions on 8970Hz
>
>
> Hello again!
>
> At about 12:30UT I disconnected the lightning protector again.
>
> At 500mA Antenna current the wires from the roof are at about 200V and
> the current to earth was measured at 60mA.
>
> I did this connecting/disconnecting-test now several times but the
> signal received by Lubos in 40km distance didn't show any noticeable
> difference. That's a riddle to me.
>
> The only difference I notice locally, is that the field-strength in my
> shack (directly under the roof) is much higher when the protector is
> disconnected because the shielding effect of all the metal parts on
> the
> roof isn't given any more. This also can be seen on my grabber.
>
> 73
> Gerhard
>
>
>
>
>
>
>
>
>
> Am Sonntag, den 23.01.2011, 13:01 +0100 schrieb Gerhard Hickl:
> > Hello Lubos and group!
> >
> > Yes, I started at about 11UT.
> >
> > Yesterday at 12:45UT I reconnected the lightning protector of the
> house
> > to ground but I couldn't see any difference on the plot you sent.
> >
> > So I guess if connected or not doesn't play a big role. On the other
> > hand, there's a high voltage on the wire coming down the roof which
> must
> > lead to some current flowing to ground.
> >
> > Maybe I will disconnect again in the afternoon and measure Voltage
> and
> > Current.
> >
> > Today we have strong wind here and I will see how long I can keep
> the TX
> > running.
> >
> > 73, tnx
> > OE3GHB
> > Gerhard
> >
> >
> >
> >
> > Am Sonntag, den 23.01.2011, 12:40 +0100 schrieb Lubos OK2BVG:
> > > Hello Gerhard, VLF!
> > > I noticed, that you had started transmissin at 11:00UT ( S/N =
> 15dB).
> > > I saw Ossi´s transmission from 09:30 to 11:00UT, but very weakly,
> as
> > > usual
> > >
> > >
> > > Lubos, oK2BVG
> > >
> > >
> > > ***************************
> > >
> > > > From: [email protected]
> > > > To: [email protected]
> > > > Date: Sun, 23 Jan 2011 10:07:28 +0100
> > > > Subject: Re: LF: Transmissions on 8970Hz
> > > >
> > > > Hello Daniele, group!
> > > >
> > > > I will fire up later slightly below 8970.
> > > >
> > > > Ossi is already transmitting.
> > > >
> > > > 73
> > > > OE3GHB
> > > > Gerhard
> > > >
> > > >
> > > >
> > > > Am Sonntag, den 23.01.2011, 00:54 -0800 schrieb Daniele Tincani:
> > > > > Hello VLF,
> > > > > any transmission tests planned today?
> > > > > Regards
> > > > > D.
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
>
>
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