[TowerTalk] Impedance at the Feedpoint

[john at kk9a.com]

Why use an open wire feeder?  You can tune the antenna at the base and run 
coax.  You can even have a relay to bypass the tuning section when using it 
on 160m.  Another option would be a relay or trap on the antenna wire.

John KK9A


To: Steve Hunt towertalk at contesting.com
Subject: Re: [TowerTalk] Impedance at the Feedpoint
From: Grant Saviers
Date: Sat, 06 Nov 2010 15:47:21 -0700
List-post: <towertalk at contesting.com">mailto:towertalk at contesting.com>

It is going to have a pretty high impedance, just how high is hard to
predict but the 50ohm swr is likely higher than 10. So an "open wire
feeder" and a matching section is called for.

<snip>
Grant,  KZ1W



>
> On 06/11/2010 20:21, Bill Gillenwater wrote:
>> If you have a feedpoint impedance of 32 ohms on an inverted "L" for 1.8 
>> mhz,
>> can anyone venture a guess as to what the impedance would be of the same
>> antenna at 3.5 mhz ??
>>
>> thanks, Bill