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Re: [TowerTalk] Type 31 baluns

To: "Tower Talk List" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Type 31 baluns
From: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 01 Jun 2010 23:22:21 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Tue, 01 Jun 2010 21:55:56 -0700, jimlux wrote:

>Jim Brown wrote:
>> On Tue, 01 Jun 2010 19:36:40 -0700, Kevin Normoyle wrote:
>> 
>>> We started this saying the baluns at balundesigns could be outdone. 
I've 
>>> not seen the one true answer that makes me believe that yet.
>> 
>> One true answer? Gee, I've published measured data and showed 
exactly what 
>> I measured and how I measured it. Have you gotten that from any mfr 
of any 
>> balun or similar product? 
>> 
>>> What I think i see is a little bit of a cheat: tuning baluns so you 
say 
>>> they're "better" for restricted ranges within 3.7-30mhz?
>> 
>> 3.5-30 MHz is hardly a restricted range -- it's all but one of the 
HF 
>> bands. How many hams have antennas that cover that much range?  I 
don't 
>> have any. 
>> 
>>

>Jim,

>Speaking of widebands.. what about recommendations for chokes to use 
>with an autotuner at the feedpoint/base. That *is* a broadband 
>application. 

That's an application where I think the bifilar THHN chokes would 
really shine, both because of their wide bandwidth, and because the 
tuner takes care of any mismatch that the THHN introduces. 

>My practical experience has been that you need to choke 
>both the feedline AND the power/control lines to the tuner (not 
>together.. one choke for coax, one for power). 

I agree. I'll need to address that this summer when I work out an 
arrangement to load my grounded 120 ft tower on 160M. In addition to 
the coax, there are control cables for both the rotor and the SteppIR 
motors. 

>And, probably, choke it at both ends.

That may depend on the installation. There's no downside to a second 
choke at the other end. 

73,

Jim K9YC




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