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