Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 (Tek) 9/28/84 based on 9/17/84; site shark.UUCP
Path: utzoo!decvax!tektronix!orca!shark!philb
From: philb@shark.UUCP (Phil Biehl N7FWL)
Newsgroups: net.ham-radio
Subject: UHF Collinear-Coaxial Antenna Help
Message-ID: <1515@shark.UUCP>
Date: Mon, 26-Aug-85 18:01:53 EDT
Article-I.D.: shark.1515
Posted: Mon Aug 26 18:01:53 1985
Date-Received: Tue, 27-Aug-85 13:15:36 EDT
Distribution: na
Organization: Tektronix, Wilsonville OR
Lines: 23
Xref: tektronix net.ham-radio:03181 


	I am looking at this type of antenna to use as a base/repeater
	gain vertical and would like to communicate with some one who
	has experience and/or knowledge about building these babies.

	My sole source is an old ARRL FM and Repeaters Manual and the
	diagram describing it is for a single halfwave array. I would
	like to add more sections to increase the gain but do not 
	understand how this is accomplished. The diagrammed array 
	from the bottom to the top consists of: a 1/4 wave stub (for
	reducing feedline radiation), a 1/4 wave section, a 1/2 section,
	another 1/4 wave, and finally a 1/4 whip at the top. What I want
	to do is to add more sections for a higher gain figure but do
	not know which sections to duplicate. Do I add just more 1/2 
	wave sections or do I need to add 1/4 wave sections along
	with the 1/2 wave sections?

	Any and all help appreciated. TNX

	73
	Phil Biehl, N7FWL
	503-685-2122
	tektronix!shark!philb