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Re: [TowerTalk] Reduced size receiving antennas

Subject: Re: [TowerTalk] Reduced size receiving antennas
From: K4SAV <>
Date: Wed, 09 Dec 2009 13:43:38 -0600
List-post: <">>
The only penalty for making a smaller than normal size K9AY is that it 
will have less gain.  The smaller sizes actually have a better pattern 
on the higher bands.  Gain versus size on 1.8 MHz are approximately as 

Normal size = -27 dBi
3/4 size = -33.7 dBi
1/2 size = -38.5 dBi

The amount of preamp gain you need somewhat depends on the noise level 
at your location.  In the winter at my location the band noise on 160 
gets very low, and although I have a different receiving antenna than a 
K9AY, I use a preamp with enough gain to bring the receive antenna gain 
up equal to the transmit antenna gain.  You won't be able to use that 
much gain other than in the winter time and at a low noise location.

Jerry, K4SAV


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