[TenTec] which balun?

[Bob McGraw - K4TAX]

What is the impedance of the antenna at the feed point where the balun is 
connected?  It most assuredly is not the feedline Z of 450 ohms.  Unless the 
feedline is an electrical 1/2 wave then the feedline is then acting as a 
line section transformer.  On some bands the actual feed impedance might be 
25 ohms while on other bands as high as 2000 ohms.  In each case, different 
baluns ratios would be preferred.

In both cases, I prefer 1:1 current baluns rated at 5X to 10X actual 
transmitter power.  Remember that balun power ratings are for MATCHED 
impedances.  In most cases, they are not working at matched impedances and 
thus must be de-rated for power handling.

73
Bob, K4TAX




----- Original Message ----- 
From: "denton sprague" <denton at oregontrail.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Saturday, July 27, 2013 9:59 AM
Subject: [TenTec] which balun?


Thought would start a little poll..
Which balun are you using with your 238 series TT tuners and multi band 
antenna?
Currently, I use a balun designs 4214t 4:1 balun to feed my 80 meter 
horizontal loop…with 450 ohm feeders.
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