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Message-ID: <001901c7d42b$e6fbeaa0$86048351@w4o8m9>
From: "James Moritz" <james.moritz@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
References: <005001c7d3fe$e4786d80$6400a8c0@oem17oeylz9on8>
Date: Wed, 1 Aug 2007 12:05:42 +0100
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Subject: LF: Re: newbie help
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Dear Paul,

In a nutshell:

- You can tune up more or less any bit of wire for reasonable results on =
500kHz. For best results, make it as high up as possible, and =
secondarily as long as possible. An HF long wire, or dipole with feeders =
strapped would be fine.

-Work out the capacitance of the wire (see formulas on ON7YD's antennas =
pages). and calculate the inductance for resonance around 502.5kHz. For =
most HF-sized wire antennas, this will be of the order of 100s of uH. =
The resulting coil is connected in series with the antenna downlead. It =
needs to be adjustable because the resonance will be quite sharp. An =
earth connection is required, preferably close to the downlead/loading =
coil - a number of ground rods connected together is usually as good as =
anything.

-For reception, that will work fine, for transmission you also need to =
adjust the resistance match, either with a tapped transformer, or with a =
tap on the loading coil itself. Some kind of impedance bridge, SWR =
bridge etc. will be useful.

Good luck,

Cheers, Jim Moritz
73 de M0BMU
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.2800.1106" name=3DGENERATOR>
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Dear Paul,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>In a nutshell:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>- You can tune up more or less any bit =
of wire for=20
reasonable results on 500kHz. For best results,&nbsp;make it as high up =
as=20
possible, and secondarily as long as possible. An HF long wire, or =
dipole with=20
feeders strapped would be fine.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>-Work out the capacitance of the wire =
(see formulas=20
on ON7YD's antennas pages). and calculate the inductance for resonance =
around=20
502.5kHz. For most HF-sized wire antennas, this will be of the order of =
100s of=20
uH. The resulting coil is connected in series with the antenna downlead. =
It=20
needs to be adjustable because the resonance will be quite sharp. An =
earth=20
connection is required, preferably close to the downlead/loading coil =
-&nbsp;a=20
number of ground rods connected together is&nbsp;usually as good as=20
anything.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>-For reception, that will work fine, =
for=20
transmission you also need to adjust the resistance match, either with a =
tapped=20
transformer, or with a tap on the loading coil itself. Some kind of =
impedance=20
bridge, SWR bridge etc. will be useful.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Good luck,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Cheers, Jim Moritz</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>73 de M0BMU</FONT></DIV></BODY></HTML>

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