Hamradio 360 Antenna Analyzer

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Prostetnic
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Hamradio 360 Antenna Analyzer

Post by Prostetnic » 08 May 2017, 06:30

I have just built one of these and wonder if anyone here as done the same.
It seems to work very well and is easy to use, especially with it connected to a PC.
I would be interested to know how accurate it is and perhaps how to check that without another analyser.

oh5nxo
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Re: Hamradio 360 Antenna Analyzer

Post by oh5nxo » 08 May 2017, 15:10

I don't have one, but a crude test might start as follows:

Leave the jack open. SWR infinity everywhere? Probably around 10 or 20 instead, limit of the instrument. Short it with the shortest possible piece of wire. SWR also infinity? Find a 100 ohm resistor and stick it in. SWR ought to be 2 everywhere, veering off a bit at the 30 MHz end, more so if the resistor is not the non-inductive sort. Add another in series, 200 ohm in total, SWR now near 4 ? Replace one of the resistors with a 1nF cap, SWR now around 2.6 at 3 MHz, going down to near 2 at 30 MHz.

No guarantee on those numbers,
Juha

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Prostetnic
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Re: Hamradio 360 Antenna Analyzer

Post by Prostetnic » 08 May 2017, 19:14

Thanks for the information Juha. I will give it a go and see what I get.

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Re: Hamradio 360 Antenna Analyzer

Post by Prostetnic » 09 May 2017, 11:44

I have checked it out as you suggested and with various wire antennas.
It does perform well around the 50 ohm mark but response is not so good away from that.
So works fine for trimming an antenna but would not recommend it if you wanted to do a full frequency sweep.

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