[TowerTalk] Impedance at the Feedpoint

[Al Williams]

how did you determine the ground loss resistance of 13 ohms at 1.8 mhz & 
what would be the ground loss resistance at 3.5 mhz?
k7puc


----- Original Message ----- 
From: "Steve Hunt" <steve at karinya.net>
To: <TOWERTALK at contesting.com>
Sent: Saturday, November 06, 2010 1:45 PM
Subject: Re: [TowerTalk] Impedance at the Feedpoint


> An EZNEC model of an Inverted-L with 60ft vertical and 77ft horizontal
> gave me a resonant feedpoint resistance of 32 Ohms at 1.8MHz when the
> ground loss resistance was 13 Ohms. That same antenna at 3.5MHz had a
> feedpoint impedance of 6000-j1000 Ohms.
>
> That's to be expected - the wire is close to a half-wave long on 80m.
>
> 73,
> Steve G3TXQ
>
> 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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