[Antennas] Antenna Design Help Please

Thu, 24 Jan 2002 00:41:36 -0800

That's close enuf.
----- Original Message -----
From: Chris BONDE <[email protected]>
To: Nathan, Kevin <[email protected]>
Cc: <[email protected]>
Sent: 23 January, 2002 20:47
Subject: Re: [Antennas] Antenna Design Help Please


> I am in no way knowledgeable about antennas.  But I have been reading
> alot.  I shall have to save up some money and by one of those modellers to
> try some of this one.  Understand tha t learning how to use one is a
challenge.
>
> Having said that, what yoou have describes sounds a lot like a folded
> unipole by Paul Lee, N6PL.
>
> Chris opr VE7HCB
>
> At 09:32 AM 2002-01-23 -0800, Nathan, Kevin wrote:
> >Hi All,
> >
> >I am still working on getting something that works well over the entire
160
> >meter band.  I have a design in mind but, being blind, can't use EZNEC to
> >model it.  So, would one of you gurus on here please model the following
for
> >me if you have the time and let me know what you find.  Please send
private
> >replies to this address and cc to [email protected].
> >
> >I have in mind to build a folded Marconi.  Let's start with 130 feet of
450
> >ohm windowed ladder line.  Short one end together and call this the
> >insulator end.  Now, let's put this up as an inverted L with about 45
feet
> >of it vertical and the rest horizontal sloping to approximately 20 feet
at
> >the end.  At ground level, feed one side with the coax center conductor
and
> >the other side with the shield.  Attach at least one above ground,
quarter
> >wave counterpoise to this shield connection.  I would like to see what
kind
> >of characteristics this antenna would exhibit.  Next, using more classic
> >design, let's come back 7.5 feet from the insulator end (in other words,
> >123.5 feet out from the feed point) and short the line together thus
leaving
> >the equivalent of a single wire for the remaining 7.5 physical feet.
Does
> >this change the characteristics of the antenna greatly?
> >
> >I would really appreciate any information anyone could give me as to how
> >this models.  I have used similar antennas in the past made from 300 ohm
> >twin lead but not ladder line.
> >
> >Thanks in advance for your help.  73
> >Kevin, K7RX
>
> - - -
>
> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
> _______________________________________________
> Antennas mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/antennas