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Date: Fri, 28 May 2010 12:04:14 -0500
From: "Mike.WE0H" <we0h@gmx.com>
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Subject: Re: LF:  8.97kHz - Near field test by ear: The "human factor"
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We all started in tiny baby steps in life. It goes the same with=20
successful radio experiments. Start out with small experiments and that=20
can grow to larger experiments. You EU guys are the pioneers of the 8kc=20
band.

Mike
WE0H


Horst S wrote:
> Hello dreamers
>=20
> Unbelievable: 400m at by ear reception with only 4 Watt and a small=20
> earth base? At my QTH at city environment my 30m earth base at about 300=
=20
> W did not work. At my T-antenna the 300 W were just good for only 100=20
> meters.
>=20
> Of course one limiting factor still is the influence of trees and buildi=
ngs.
>=20
> But what is the influence of the different frequencies used? I did my=20
> tests around 8.9 kHz. Now I reproduced them with 1 kHz but the=20
> audibility did not improve. I testet the other frequencies in 1kHz steps=
=20
> up to 8.9 kHz with the same results. So I am sure that I hear more ore=
=20
> less linear in that frequency range. So the different frequencies can=20
> not be the reason for my lower "ODX".
>=20
> In the next step I tried to hear not a single frequency but a 1 kHz=20
> stepped sweep signal between 2 and 8.9 kHz and later a DFCW signal 2.5=
=20
> and 3 kHz. The sweep signal was clearly audible at more than double the=
=20
> range. My "ODX" increased to nearly 300 Meters just by ear.
>=20
> The effect seems to be more psychological. I heard the stepped sweep=20
> signal much better than its single frequencies.
>=20
> Could it improve the audibility to go from A1 to A2 by just modulating=
=20
> the carrier with an other? I assume an oscillator like XR2206 is not=20
> stable enough but possibly worth a try.
>=20
> Possibly anybody knows a software that achieves creating a testfile.
>=20
> But this is not of priority.
>=20
> Tomorrow I'll do another near field test with an eField antenna at my=20
> roof top.
>=20
> One can discuss sense or nonsense of this walk around tests. To me it's=
 fun.
>=20
> Of course other more DX related (OK, I hope so.) tests will follow=20
> within the next weeks. Yesterday I conducted most of my material for the=
=20
> earth base test coming soon. The most important: about 800m crude wire=
=20
> are now on a reel. I don't know how often I crossed the soccer field in=
=20
> my neighbourhood . . .
>=20
> vy73 Horst DO1KHS/DI2AN
>  =20
>=20
> NEU: WEB.DE DSL f=C3=BCr 19,99 EUR/mtl. und ohne Mindest-Laufzeit!  =20
> http://produkte.web.de/go/02/
>=20