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Questions tagged [antenna]

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Questions about the design, selection, building, testing, mounting, or properties of antennas. See also specific tags: [antenna-theory], [antenna-construction], [dipole], etc.

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I am very new to the art of amateur radio, and just got myself an antenna. I don't intend to use it in a permanent location (for example fixed to my house), rather I plan to be using it at parks and ...
Ryuji AB1WX's user avatar
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3 votes
3 answers
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I keep hearing the recommendation to make your SWR as low as possible and that would imply good tuning. I'm a new HAM and made a centre-fed half wave fan, 40m, 20, 15m. It works, and pretty well. I ...
lornop's user avatar
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3 votes
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Take, for example, a shielded loop antenna. It is often claimed that the antenna is inside the shield, and the shield blocks electric fields from reaching the antenna, while allowing magnetic fields ...
Pavel Andreev's user avatar
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3 answers
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My understanding is that the desired mode of operation for a two wire transmission line is differential, where at any point along the line the addition of the voltage or current is zero, such that the ...
Christian's user avatar
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1 vote
3 answers
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This is not strictly amateur-related, but the perusing I've done on Meta, and by my reading of https://ham.stackexchange.com/help/on-topic, indicates that this is within scope. I was looking at the ...
glen_geek's user avatar
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3 votes
2 answers
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I was wondering how the current flows in a coaxial cable. Say for instance that the inner conductor transfers the signal, so there flows a current. How will in the outer conductor(shield), flow a ...
Scientific Consultants's user avatar
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1 answer
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I've hung it from the eave of the house (~8') to a tree with the high end at ~20'. Drilled a hole in the aluminum plate for counterpoise stud and connected a 40' counterpoise. Counterpoise is at ~8' ...
Louis Seaman's user avatar
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1 vote
1 answer
314 views

Consider a microwave RF source going to an unbalanced coaxial cable, then using a 1:1 balun to feed a dipole/Yagi style antenna. How can I test this 1:1 balun in isolation, independent of the type of ...
Community's user avatar
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1 vote
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Conversion from nec2 geometry to x3d or some other format to read nec2 geometry files into (ultimately) OpenEMS would I think be good. I found a reference in a document ...
Pete's user avatar
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1 vote
2 answers
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I recently purchased a 4 element quad for 10 m from Lightning Antennas in USA. The antenna is designed to be mounted so the elements are diamond shaped. Notice in the picture how nice and straight the ...
Elliott Hart's user avatar
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2 answers
446 views

When I say 'mounted to a bull bar' I mean the antenna being metal on metal contact to the bull bar without any rubber or fiber glass keeping the materials from touching. Could this affect the ...
Community's user avatar
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2 votes
2 answers
144 views

When we purchased our house, it came with a Yagi antenna from 30+ years ago, but I can't tell what it is. Until recently, it was too far off the ground to get a good look: A windstorm blew it down two ...
KJ7LNW's user avatar
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In the near future, I'm planning to build an indoor inverted V dipole. However, I won't be able to raise the ends significantly above the floor. I understand that this will adversely affect ...
KD5ITM's user avatar
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1 vote
1 answer
109 views

How can I measure how much power is output from a receiving antenna when another, physically adjacent antenna is transmitting? I have a VHF/UHF collinear vertical antenna connected to a transceiver ...
Ryuji AB1WX's user avatar
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2 votes
2 answers
255 views

I read about using a SLINKY out in the field for an antenna. Sounds easy, doesn't it? Well, how does one go about identifying the length needed for the band of interest? Assume that the slinky has a ...
Ryuji AB1WX's user avatar
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