[VHFcontesting] CATV hardline matching

[Michael Sapp]

Hi All:  With respect to using un-uns, I found them to be reasonably low 
loss through 50 MHz with type 61 cores, having built a dozen or so and 
measuring back to back pairs of them on an HP141T for throughput loss. There 
is an easy-to build (5) multi-match unun on pages 101~103 of Sevick's 
"Understanding, Building, and Using Baluns and Ununs book with a 72~75 ohm 
tap. Great book. Worth every penny.

 I also used the 3/4 inch plumbing pipe versions with 9/32 hobby brass 
center conductors from 144 MHz through 1296 MHz years back at my old QTH 
(one hilltop away) and at W3KWH. I still have the quarter wave matching 
section info originally from  WA6MGZ in an old August 1982 Luner Letter 
scanned in a jpg format if anyone cares to review. I probably have a few 
quarter wave transformer VHF cut-offs up in the garage attic but it may be 
easier to build clean new ones versus deox something 15~20 years old. 
E-mail me at verizon.net with my call sign if the Lunar Letter info is of 
interest.  Mike wa3tts