[TowerTalk] Baluns and Ununs

[Red]

Hi, Jerry and TTs;

The bandwidths, efficiencies, and impedance levels of BALUNs vary 
widely.  You must know what you are doing in choosing one for a 
particular application.  The wrong balun may not provide the match you 
expected, it may not cover the bands you expected, it may be 
inefficient; it may go up in smoke.  BALUNs offered commercially or 
built according to many articles are not all suited for all applications.

One good source of information is, "Understanding, Building, and Using 
Baluns and Ununs" by Jerry Sevick, W2FMI.  I have an edition copywrited 
in 2003 by CQ Communications, Inc.  The author holds a Ph.D in applied 
physics from Harvard University and worked  for AT&T Bell Labs.  He has 
long experience with ham radio and has written several articles and 
books.  This book offers some explanation of what baluns and ununs do 
and how to build them.  A 4:1 baluns for matching 50 ohm coax to a 12.5 
ohm tribander is quite easy and inexpensive to build.  I think this is 
what the KT-34A requires; the book offers many other designs, one of 
which should fill the bill.

73 de WOØW

Jerry wrote:

>I just obtained a used KT-34A because the price was right (free).  Looks
>to be in great shape, but I'm still going to purchase the M2 rehab kit.
>   The balun needs to be replaced however (broken).  M2 wants $119 for
>the replacement while other 4:1 baluns can be purchased for considerably
>less (in the $20-30 range).  Would this be a mistake?  Would I be buying
>a problem or do I get what I'm paying for?  Anyone have any helpful tips?
>Tnx
>Jerry France
>K7LY
>
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