Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [antenna-system]

The system composed of an antenna and a feed line, and possibly also an RF ground connection, antenna tuner, balun, phasing device, et cetera.

152 questions
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Upconverted Radio Link

I'm 2 months into my RF and SDR learning, and I'm stuck in the middle of a project, looking for some clues: First, as detailed here, I connected two 125kHz RFID antennas through a 5m, 2-wire copper cable (no coax), and I was able to relay the RFID…
gcaglion
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What's a good choice of antenna tuners, if I add a 800 watt amp to my station

I am running a barefoot 100 watt radio for my HF operations now. Also using a MFJ tuner that's limit is 300 watts. I am putting on my wish list a 800 watt amp. So I know I will have to upgrade my tuner. Looking for suggestions on a new tuner to work…
Stephen Dick
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What lengths of coaxial feed lines should you avoid?

Are there lengths of feed line to avoid or ones that may cause problems with an antenna system? For single band use. Appendix: The run of coaxial will be for the 10 metre band. I would imagine this has no or little relevance as lengths can be…
Francis Archibald
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Determing short or open location in antenna system

I have a G5RV antenna. It used to work fine. I had it disconnected for several months. Now I can't get it to load. I think there may be a short or open in the coax. Is there a way to determine how far out on the coax the problem might be? Much…
Gary Britten
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How lossy are gamma matches?

What are the real losses associated with a typical gamma match at a set frequency? Furthermore, are there good designs or dimensions to minimise these losses?
Francis Archibald
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How can I design a microstrip patch rectenna that can power up 1W of payload?

I know the major components of rectenna should be Receiving antenna - Patch Antenna Matching circuit Low pass filter Rectifier - Schottky diode but I could not visualize how can we put all these things together. Can anyone help, please? For…
Heng Penghui
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Output power curve of an antenna

My approach is that a radio wave is made from zillion of accelerated electrons which emit zillions of photons. Since the current flows in a open circuit, the antenna generator works against something like a capacitor. So I want to know, is my…
HolgerFiedler
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