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Re: Topband: 2 wire beverage question

To: Kenneth Grimm <>,
Subject: Re: Topband: 2 wire beverage question
From: Mike Waters W0BTU <>
Date: Sat, 20 Nov 2010 15:20:53 -0800 (PST)
List-post: <">>
I should have mentioned that those Beverage transformers near the bottom of were made from stacked 
FB-73-801 ferrite beads. I used 24 AWG enameled wire. There is no difference in 
performance of either Beverage.

I bought some binocular cores with the intention of doing some comparisons with 
those transformers. Near the bottom end of the AM broadcast band, it seems that 
the directional properties might be off; KTWO AM 560, ENE about 45 miles away 
Springfield, MO seems to be a tad stronger on the SW direction. It works just 
fine on 160, but with another transformer I used in the past, KWTO seemed to be 
strongest to the NE.

I used galvanized electric fence wire, and calculated the diameter (.061") vs. 
spacing (1.1") so that the feedline impedance was equal to the impedance 
the feedline and ground at 10' high. If you construct your Beverage so that 
those two impedances are significantly different, then you should use a 
reflection transformer other than a 1:1 as I did.

Mike Waters

From: Kenneth Grimm <>
Sent: Sat, November 20, 2010 1:23:47 PM
Subject: Topband: 2 wire beverage question

Has anyone built a two wire beverage simply fed with two lengths of RG-6
instead of the usual switching arrangement in the feed end box?  The
arrangement appears in most of the literature since the earliest days, but I
don't think I've ever heard of anyone doing it that way.  At this stage
however, I've got more RG-6 than I have inclination to build a switch box,
bias T, etc, plus the fact that I already have a switch box in the shack to
take the two coaxes.  Advice appreciated.

Ken - K4XL
UR RST IS ... ... ..9 QSB QSB - hw? BK

UR RST IS ... ... ..9 QSB QSB - hw? BK

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