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.
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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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Topband Reflector
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Topband Reflector
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