Topband
[Top] [All Lists]

Topband: Beverage Length

To: <topband@contesting.com>
Subject: Topband: Beverage Length
From: btippett@alum.mit.edu (Bill Tippett)
Date: Wed, 18 Oct 2000 00:52:24 +0100
W8JI wrote:

>To terminate the antenna, do the same sweep test and adjust the 
>termination for minimum SWR change with frequency. You will 
>never get the reactance out (except at periodic frequencies) 
>because lossy transmission lines (which is what the Beverage is) 
>have "internal" reactance, but adjusting for minimal SWR change 
>as frequency is swept will be darned close to optimum termination.

        One of the slickest ways to do this is with AEA's Complex
Impedance Analyzer...the one which shows a LCD display of SWR vs. freq.
I normally set it up so that it sweeps 1.5 to 3.5 Mhz and have trained
my XYL to tell me when it looks most flat while I adjust a noninductive
pot at the termination end.  You can also do it with other analyzers but
the AEA's graphic display makes it very easy.

                                                73,  Bill  W4ZV


--
FAQ on WWW:               http://www.contesting.com/FAQ/topband
Submissions:              topband@contesting.com
Administrative requests:  topband-REQUEST@contesting.com
Problems:                 owner-topband@contesting.com


<Prev in Thread] Current Thread [Next in Thread>