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Old March 23rd 06, 11:18 AM posted to rec.radio.amateur.antenna
 
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Default V Beam, do they work?


Dale Parfitt wrote:
wrote in message
oups.com...
I've been modeling V beams off and on for a few years now, and never
can seem to get one that has useful gain.

Has anyone seen a successful model anyplace of a two or three wave V
with good gain??

73 Tom

Hi Tom,
I have a model of a 5 wavelength 24MHz Vee beam in AO- I can send the file
if it is useful to you. AO reports 11dBi free space gain. Included angle
appears to be 44 degrees.


I don't have AO Dave, so a description will work.

That sounds like the problem I am seeing. With a 3-5 WL long V, I have
about the same gain as a three element Yagi. But I'll still try to
model your antenna with 5wl legs and 44 degree angle. Thanks.

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Old March 23rd 06, 01:19 PM posted to rec.radio.amateur.antenna
Dale Parfitt
 
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Default V Beam, do they work?


wrote in message
oups.com...

Dale Parfitt wrote:
wrote in message
oups.com...
I've been modeling V beams off and on for a few years now, and never
can seem to get one that has useful gain.

Has anyone seen a successful model anyplace of a two or three wave V
with good gain??

73 Tom

Hi Tom,
I have a model of a 5 wavelength 24MHz Vee beam in AO- I can send the
file
if it is useful to you. AO reports 11dBi free space gain. Included angle
appears to be 44 degrees.


I don't have AO Dave, so a description will work.

That sounds like the problem I am seeing. With a 3-5 WL long V, I have
about the same gain as a three element Yagi. But I'll still try to
model your antenna with 5wl legs and 44 degree angle. Thanks.

Hi Tom et al,

This is from the AO library:
F=24.94

The vertex is at the origin: 0,0
X,Y of 1st leg is 185.44', -74.92' #12 wire
X,Y of 2nd leg is 185.44', 74.92' #12 wire

Fed at the origin and modeled in free space

AO reports
Z= 255- J706
Forward gain= 11.34dBi
F/B 2.70dB


Hope this is useful,

Dale W4OP


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