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Re: [TowerTalk] Twinlead- Zepp

To: Ian White GM3SEK <>
Subject: Re: [TowerTalk] Twinlead- Zepp
From: Bill Aycock <>
Date: Fri, 04 Nov 2005 08:02:51 -0600
List-post: <>
Ian- you have (mostly) fit into my own feelings about the use of the 
name"Zepp". As I exsplained to another Ham, I have received about five 
conflicting definitions. Of all the posts I have received, yours makes 
the most sense.

Ian White G/GM3SEK wrote:

>Tom Osborne wrote:
>>The most common is probably 'center fed zepp.'  Other names include 
>>the 'tuned doublet' and 'dipole with tuned feeders.'"
>That's about normal: given a choice of three names for something, radio 
>amateurs will ALWAYS choose the one that creates the most confusion.
>The original zeppelin antenna was intended to be trailed behind an 
>airship, so it was definitively END-fed. More specifically, it was a 
>half wave, end-fed through a quarter-wave of twin open-wire to keep high 
>RF voltages away from all that hydrogen. In other words, it was a 
>trailing J-pole.
>Earthbound hams and others adapted this idea to make a horizontal 
>antenna which was end-fed with mostly vertical open-wire... and OK, that 
>is still recognizably a zepp. But then somebody tied a second wire to 
>the open end of the feedline, and called it a "double zepp". Since this 
>is the most confusing and inappropriate name imaginable, it's the one 
>that hams have insisted on using ever since.
>Let's get back to basics here: you're not using a zeppelin antenna 
>unless your ham station (a) can fly, and (b) can go up in a fireball. 
>That should narrow it down.

Bill Aycock W4BSG
Woodville, Alabama


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