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Topband: Reversible beverage terminating resistors

To: Topband Reflector <topband@contesting.com>
Subject: Topband: Reversible beverage terminating resistors
From: "Kenneth D. Grimm, K4XL" <grimm@sbc.edu>
Date: Sun, 03 May 2009 13:26:13 -0400
List-post: <topband@contesting.com">mailto:topband@contesting.com>
I've got a pair of DX Engineering reversible beverage systems and I am 
delighted with how they work.  One more would cover the major points on 
the compass rose that I'm interested in.  Feeling that "radio fund" 
wouldn't run to a third DX Engineering set, I decided to build my own.  
One point that has been discussed rather extensively on the reflectors, 
on the web and in print is the size and composition of the terminating 
resistor.  Generally, a 2 watt carbon composition resistor is recommended. 

I checked my junk box, which is otherwise rather well stocked, to 
discover that there were no 75 ohm 2 watt carbon comp resistors. 
After contemplating the problem for a while, it occurred to me that 
there are no 2 watt carbon composition resistors in the DX Engineering 
units!  Instead, they have very cleverly brought the termination line 
out through an F connector socket and used a 75 ohm F termination plug.  
These plugs are available for as little as 15 cents and an average of 
about 35 cents.  While they are almost certainly well shy of a 2 watt 
rating, they are dead simple to replace, if and when they ever get zapped. 

I would be interested to know if anyone else has copied DX Engineering's 
use of the F termination plug in their reversible beverage systems.  
Likewise, I would be interested to hear from anyone using the DX 
Engineering system who has experienced failure of the plugs.  Is this a 
weak link or a clever bit of engineering?

73,

-- 
Ken K4XL
k4xl@arrl.net

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