[Elecraft] New list member/T1 tuner questions

[Geoffrey Mackenzie-Kennedy]

Rick,

A "long wire antenna" can be fed at any point along its length, not only at 
one end, but at any given frequency the antenna's pattern will change as 
will the antenna's feedpoint impedance as the position of the feedpoint is 
changed. Some schemes such as the Off Centre Fed wire place the feedpoint at 
a position where the feedpoint impedance is lowish and similar on several 
bands, allowing the use of a coax feeder, but radiation from the coax feeder 
can be a problem if not prevented.

When I was a young ham, a "long wire" had to be at least three or four 
wavelengths in length. They have shrunk in recent years :-)

73,
Geoff
GM4ESD


----- Original Message ----- 
From: <qrp_1 at juno.com>
To: <elecraft at mailman.qth.net>
Sent: Sunday, July 12, 2009 7:54 PM
Subject: Re: [Elecraft] New list member/T1 tuner questions


>  I do not understand this statement.  How can a "long wire antenna" have
> 2 sides ?  A long wire is fed from one end only, so are you speaking of
> an endfed wire with an equal length counterpoise laying on the ground or
> are you speaking of a doublet antenna fed in the center with a feedline ?
> I do have manual tuners but want something much simpler like and end fed
> wire with an auto tuner for quick band changes in the field - don't want
> to pack something the size of a MFJ-941 tuner into the woods !