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#1
March 22nd 06, 12:17 AM
posted to rec.radio.amateur.antenna
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Quad Antenna
Question - Is the polarity of the antenna based on the feed point?
73's |
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#2
March 22nd 06, 12:28 AM
posted to rec.radio.amateur.antenna
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Quad Antenna
"Howard W3CQH" wrote in message ... Question - Is the polarity of the antenna based on the feed point? 73's Yes |
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#3
March 22nd 06, 12:47 AM
posted to rec.radio.amateur.antenna
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Quad Antenna
"Howard W3CQH" wrote in message ... Question - Is the polarity of the antenna based on the feed point? 73's Yes -- see URL: http://www.ham-shack.com/beam.html -- CL -- I doubt, therefore I might be ! |
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#4
March 22nd 06, 02:36 AM
posted to rec.radio.amateur.antenna
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Quad Antenna
Yes!
Feeding at the "bottom" makes it horizontal and the "side" vertical. There is obviously some response in the other polarity (more than a yagi?) but I havent researched this. The square can also be a rectangle... (Beware of feedpoint Z changes) You can also feed the in quadrature on two adjacent corners for circular.. Cheers Bob VK2YQA Howard W3CQH wrote: Question - Is the polarity of the antenna based on the feed point? 73's |
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#5
March 22nd 06, 11:27 PM
posted to rec.radio.amateur.antenna
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Quad Antenna
Hi - Steve,
Yes - that is correct. If the quad is a diamond shape for example, you could feed it either from the bottom "V" or the side "V". What is the polarity at each feed point? Also - if the antenna is a square, you can feed it from the middle of the bottom or the middle of the side: again what is the polarity vs. the feed point? 73's "Steve Nosko" wrote in message ... Howard, If you mean the polarization (horizontal vs. vertical), yes. 73, Steve, K9DCI "Howard W3CQH" wrote in message ... Question - Is the polarity of the antenna based on the feed point? 73's |
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#6
March 24th 06, 05:32 PM
posted to rec.radio.amateur.antenna
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Quad Antenna
Howard W3CQH wrote: Hi - Steve, Yes - that is correct. If the quad is a diamond shape for example, you could feed it either from the bottom "V" or the side "V". What is the polarity at each feed point? Also - if the antenna is a square, you can feed it from the middle of the bottom or the middle of the side: again what is the polarity vs. the feed point? Howard, The polarization of a quad fed at the bottom of a diamond is horizontal. The polarization of a quad fed on the point of the side is vertical. The polarity of the feedpoint changes 14,000,000 times if you excite it on 14MHz for one second no matter where it is fed, but the polarization only changes when you move the feedpoint to a new location. :-) That's a nice feature of a quad. By changing feedpoint loaction you can change polarization. 73 Tom |
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#7
March 24th 06, 10:16 PM
posted to rec.radio.amateur.antenna
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Quad Antenna
Thanks Tom for the information.
Best 73's wrote in message ups.com... Howard W3CQH wrote: Hi - Steve, Yes - that is correct. If the quad is a diamond shape for example, you could feed it either from the bottom "V" or the side "V". What is the polarity at each feed point? Also - if the antenna is a square, you can feed it from the middle of the bottom or the middle of the side: again what is the polarity vs. the feed point? Howard, The polarization of a quad fed at the bottom of a diamond is horizontal. The polarization of a quad fed on the point of the side is vertical. The polarity of the feedpoint changes 14,000,000 times if you excite it on 14MHz for one second no matter where it is fed, but the polarization only changes when you move the feedpoint to a new location. :-) That's a nice feature of a quad. By changing feedpoint loaction you can change polarization. 73 Tom |
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