[TowerTalk] Auto tuners, Baluns and open wire feeders

jimlux jimlux at earthlink.net
Tue Jul 17 18:24:40 EDT 2018

On 7/17/18 2:56 PM, Wes Stewart wrote:
> Think about that for a minute.  The tuner weighs something and requires 
> DC power,  Do you want to suspend a few pounds of weight + wind load + 
> coax + power cable + balun(s) at the center of a horizontal wire?

In my installation, I happened to have a support at the middle, and you 
can run power up the coax for most tuners. But yes, it's a consideration 
if you're supporting only at the ends.

Probably not a good solution for that 1km long span across the fjord 
behind your shack.

> Wes  N7WS
> On 7/17/2018 2:34 PM, Kim Elmore wrote:
>> I’ll display my benighted state by asking a question: why not place an 
>> auto-tuner at the feed point of the doublet? That way, the feed line 
>> is flat and the doublet can be any length, assuming impedance say 
>> desired frequencies are in tang of the tuner. Then, add common mode 
>> chokes at the  auto-tuner input and anywhere else desired. Won’t that 
>> do the job?
>> Kim N5OP
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