[Antennas] 30 Meter Ground plane
George, W5YR
[email protected]
2004年2月25日 06:59:33 -0600
Tune opposite radials as a pair like a dipole. Then check input impedance.
It will make a difference. Then adjust antenna length for lowest SWR. If no
loss in system, input Z should be 37 ohms at resonant frequency.
73, George W5YR
[email protected]
http://www.w5yr.com
----- Original Message -----
From: "WX5L" <[email protected]>
To: <[email protected]>
Sent: Wednesday, February 25, 2004 6:35 AM
Subject: [Antennas] 30 Meter Ground plane
> Hello,
>> For an afternoon project I built a 30 meter ground plane.
>> I used the base section of an old 14AVQ and used some tapered aluminum
> sections to obtain the 23' 1" I needed. Also installed 4 radials in a
> horizonal plane 5% longer.
>> The base of the vertical is 15' above ground on a steel mast. I also have
> the base of the vertical grounded with 3/4" braid to a 8' ground rod.
>> I found the resonant point just about where I wanted but the lowest swr is
> 1:7. I checked it with my MFJ anatenna analyzer and found the impedence
> around 33 ohms.
>> I'm looking for a way to match this 33 ohms closer to 50 ohms and keeping
> the RG8U that I'm using.
>> I'm looking for not the most complicated way but KISS and use spare parts
> from my junk box.
>> Any idea's.
>> Thanks,
>> Randy
>>> [email protected]
> Thibodaux, Louisiana
>> - - -
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