From: Rick Wakatori <7l1rll@dp.u-netsurf.ne.jp>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <000f01cb3de6$040e2780$0301a8c0@your91hoehfy9g>
References: <4C694CC6.3010609@o2.ie>  <1282007441.6432.12.camel@vaio3rd>
	 <1282014113.6432.22.camel@vaio3rd> <1282025562.6432.54.camel@vaio3rd>
	 <000f01cb3de6$040e2780$0301a8c0@your91hoehfy9g>
Organization: RLL
Date: Tue, 17 Aug 2010 18:10:45 +0900
Message-Id: <1282036245.6432.81.camel@vaio3rd>
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Subject: Re: LF: Earth electrodes antenna tests[Contest results]
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Hi Mal,
  This results was not same district or near field, but 31 districts as
shown multiplier factors. 
  There are about 70 districts in Japan. He worked about a half of total
Japan districs at 3.5MHz band. The total distance from Hokkaido Island
(near Sahhalin) to Okinawa islands (near Taiwan) is about 3000km long.
  Kanto plane area (area 1) including Tokyo Metropolitan has only 8
disticts (8 multipliers).
  This is an example of sending by the two earth electrodes antenna.
  I hope more experimeters will got a same trend.
7L1RLL Rick

On Tue, 2010-08-17 at 09:27 +0100, mal hamilton wrote:
> 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.
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
> 
>