[Milsurplus] AN-104

[jcoward5452 at aol.com]

Transmission line gets signal from A to B with (hopefully) minimum 
loss.OK.Now you want to get signal from B to C through 
space.(Atmosphere included).Transmission line needs to become a 
transformer from transmission line to radiator.Ladder line opened up 90 
deg becomes dipole.Same for coax but less broad band.Fold the braid of 
a coax back over itself and you get the "J" pole.All cases of modified 
transmission lines becoming effient radiators.Obviosly this is a gross 
simplification but expand on the premiss and you can develope any 
antenna you want.
 JC KE6PPF





-----Original Message-----
From: cosmoline at aa4rm.ba-watch.org
To: cosmoline at netboobie.org; jcoward5452 at aol.com; scr287 at sbcglobal.net
Cc: milsurplus at mailman.qth.net
Sent: Wed, 10 Jan 2007 9:00 PM
Subject: Re: [Milsurplus] AN-104

Jay wrote

> The metal sheath is there for "armor" only

Ya really think?  Those laboriously-studying jurrassic techies*
cudda put a wire whip outside like we see all over the ramp
@ civvy airports for the 125mhz +/- 5mhz am 2-ways.  Wudn't
work so terribly good for 125mhz +/- 25mhz.

Your construction description a HUGE help.  That stripped
coax center conducter IS capacity coupled to the metal
sheath.  It makes a "fat whip" with no concern about
getting a good sheath-bond to the feed line.  Ingeneous.

The 'armor factor' if true is a side benefit.

Then Jay sed

> Remember the fundamentals:antennas are special cases for transmission
  lines.

Pse 'splain.  I don't remember enuf to know how that applies here.

  Marty

*anyone hear the argument that a legion of apes @ typewriters
 will eventually turn out all of Shakespeare?  Perhaps less
 than a legion now that we have Microsoft Word.

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