Message-ID: <000f01cb3de6$040e2780$0301a8c0@your91hoehfy9g>
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <4C694CC6.3010609@o2.ie>  <1282007441.6432.12.camel@vaio3rd> <1282014113.6432.22.camel@vaio3rd> <1282025562.6432.54.camel@vaio3rd>
Date: Tue, 17 Aug 2010 09:27:22 +0100
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Subject: Re: LF: Earth electrodes antenna tests[Contest results]
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This result is misleading because Japan is so densely  populated with radio
amateurs that these stations worked were probably in the Near Field. ie in
the same district.
When I was in Singapore 9V1OY although not in the near field for Japan the
bands were buzzing all the time with Japanese acty, sounding like bees on a
water lilly. It was virtually impossible to work other stations because of
the endless racket.
g3kev

----- Original Message -----
From: "Rick Wakatori" <7l1rll@dp.u-netsurf.ne.jp>
To: <rsgb_lf_group@blacksheep.org>
Sent: Tuesday, August 17, 2010 7:12 AM
Subject: Re: LF: Earth electrodes antenna tests[Contest results]


> Hi Tony and the others,
>    Talking with JA5FP, Contest results using the two electrodes earth
> antenna were as follows:
> (1)JARL Field Day Contest: 3.5MHz, 86 QSOs, 31 multi.
> (2)KCJ Contest: 1.9MHz, 12 QSOs, 8 multi.
> Both were 50W output.
>  Where multiply factor in these contests were number of prefectures
> workedin Japan, but not DX station.
> 7L1RLL Rick
>
> On Tue, 2010-08-17 at 12:01 +0900, Rick Wakatori wrote:
> > Hi Tony,
> >   In addition to my previous introduction I forgot to say a moint :
> > (3)There is a length dependency.
> >    The two electrodes earth anntena of 2 times long can be received 3 dB
> > up.
> >    Confirm the above.
> > 73
> > 7L1RLL Rick
> >
> > On Tue, 2010-08-17 at 10:10 +0900, Rick Wakatori wrote:
> > > Hi Tony,
> > >   Thanks for the confirmation on directivity of the two electrodes
earth
> > > antenna.
> > >   The JA5FP's group said as follows:
> > > (1)Same directivity exists in a short distance.
> > > (2)Dried earth is good for transmittion. Wet ground does not work as a
> > > good antenna. an imaginal loop may be shortened in a half.
> > >
> > >   Try the above phenomenons.
> > > 7L1RLL Rick
> > >
> > > On Mon, 2010-08-16 at 15:35 +0100, Tony wrote:
> > > > Yesterday I spent some time playing with different antennae.
> > > > I started by laying out another wire 52m long orientated roughly
> > > > north/south and then I shortened my original wire also to be 52m and
> > > > this one is east/west, both terminated with an earth rod.
> > > > Results were not as expected however as although the two earth
electrode
> > > > antennae show most definite directivity they were the wrong
direction.
> > > >
> > > > I monitored BBC R. Bristol on 1548 KHz which is about 500 Km due
east of
> > > > me and on the inverted L (tuned VSWR 1.6:1) I could just detect a
> > > > carrier heterodyne, on the N/S earth electrode antenna it was S1 but
on
> > > > the E/W earth electrode antenna it was S3.
> > > > RNE5 on 531 KHz about 960 Km due south of me was S3 on the E/W and
S8 on
> > > > the N/S
> > > >
> > > > HGA22 (135 KHz) to my east was S4 on the E/W and S1 on N/S
> > > >
> > > > Readings were taken about 12:00 utc so most definitely ground wave.
> > > >
> > > > I was expecting the directivity to be broadside on the earth
electrode
> > > > antennae, but they seem to behave like a Beverage in that respect,
but
> > > > something that I think I will investigate further, maybe see if
there is
> > > > any difference if I terminate them with a resistor.
> > > > I'm sure Mal is correct though that they would be useless to TX
through
> > > > but for RX they seem to have possibilities especially after dark as
they
> > > > are a lot quieter.
> > > >
> > > > All good fun.
> > > > 73, Tony, EI8JK.
> > > >
> > >
> > >
> >
> >
>
>