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[TowerTalk] Interesting New DX Engineering Product

To: "TopBand List" <topband@contesting.com>,"Tower Talk List" <towertalk@contesting.com>
Subject: [TowerTalk] Interesting New DX Engineering Product
From: "Jim Brown" <jim@audiosystemsgroup.com>
Reply-to: Jim Brown <jim@audiosystemsgroup.com>
Date: Mon, 26 Jul 2004 00:02:01 -0500
List-post: <mailto:towertalk@contesting.com>
One of the guys in our local ham club came back from Dayton with a 
very interesting new product from DX Engineering. As soon as he 
showed it to me, I called up DX Engineering and bought two of them. 

The product is a unun autotransformer for HF antennas designed to 
transform 12.5 ohm or 25 ohm loads to 50 ohms.  This is a natural for 
matching any resonant short antenna to a modern transceiver. You 
must, of course, do something about the reactive component.  Opening 
up the box I see good components that will handle some power and 
solid, but simple construction. The website data sheet suggests that the 
unit should handle 500 watts with a reasonable VSWR. 

There are also several variations of hardware to add a capacity hat to a 
vertical antennal.  While mobile antennas are an obvious application for 
both of these products, both could also find good use in a home 
antenna farm. Used in combination, I can smell more than a few dB of 
improved efficiency. I think I also smell Tom Rauch's hand in the design. 
It that's true, many thanks, Tom!

Jim Brown  K9YC


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