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Re: LF: Re: RX3QFM

To: [email protected]
Subject: Re: LF: Re: RX3QFM
From: "Alexander S. Yurkov" <[email protected]>
Date: Wed, 18 Sep 2002 21:06:20 +0000 (GMT)
In-reply-to: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Hi, Group.

On Wed, 18 Sep 2002 [email protected] wrote:

Just a thought, but isn't an antenna current of 2.75A a bit low for 0.5W ERP?
I recall running 8 Amps to a 300 foot wire with the top at 150 feet high and Jim measured it at 0.5W ERP. Or does Vlad have something really high up?

Vlad has Heff ABT 15 m (horizontal part of antenna is 150 m). So radiation
resistanse is:

Rrad = 1600*(Heff/lambda)^2=0.073 Ohm

P = I^2*Rrad= 0.56 Watts.

I do not know why your PWR is not high as follow:

Rrad = 1600*(45/2200)^2 = 0.67 Ohm

P = 8*8*0.67 = 43 Watts

If only one end of wire has H=45m then Heff=22.5 m and P=11 Watts

73 de RA9MB/Alex

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