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Re: Topband: Broadband dipoles

To: Topband@contesting.com
Subject: Re: Topband: Broadband dipoles
From: Pete Smith N4ZR <n4zr@contesting.com>
Date: Tue, 26 Feb 2013 10:30:44 -0500
List-post: <topband@contesting.com">mailto:topband@contesting.com>
And this part:

? Antenna Efficiency
Frequency (MHz) Efficiency (dB)
2 -12.7
3 -8.8
5 -6.4
7.5 -4.8
10 -4.2
20 -2.8
30 -2.1

I'm not sure what a negative antenna efficiency means. Compared to an isotropic source? It is large, and must spend a lot of power heating those resistors.

73, Pete N4ZR
Check out the Reverse Beacon Network at
http://reversebeacon.net,
blog at reversebeacon.blogspot.com.
For spots, please go to your favorite
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On 2/26/2013 8:42 AM, Tom Boucher wrote:
It's the reference to termination resistors in the SPX data sheet that bothers 
me.

Tom G3OLB

K1FZ wrote:
<The antenna in a simpler single dipole configuration has the wire ends tied
with a perimeter wire  to give very wide frequency banding. For a modern
version of the old T-top see.
http://www.spx.com/en/tci/pd-613t-and-f-broadband-dipole-antennas/>

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