60v p-p rf

Useful information regarding antennas for SDR products.
arcosine
Posts: 17
Joined: Wed Jan 02, 2019 6:24 pm
Location: 41.678472, -88.051762

60v p-p rf

Postby arcosine » Sun Jan 13, 2019 8:12 pm

I put a scope on my long antenna and it reads 60 volts peak to peak RF from local AM stations.

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Tony
AA9CC

fotoralf
Posts: 22
Joined: Wed Aug 08, 2018 10:13 pm

Re: 60v p-p rf

Postby fotoralf » Sun Jan 13, 2019 10:02 pm

In the old days, people living near strong medium wave transmitters used to light their gardens with lightbulbs and later fluorescent tubes connected to wire antennas although it was officially a crime. We still have a law against "theft of electrical energy".

Ralf

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Roger
Posts: 196
Joined: Fri Dec 29, 2017 7:59 pm

Re: 60v p-p rf

Postby Roger » Wed Jan 16, 2019 9:33 pm

arcosine wrote:I put a scope on my long antenna and it reads 60 volts peak to peak RF from local AM stations.


In the other thread (longwave sensitivity) you mentioned 6 volts P-P and possible damage to your RSP. I posted the safe levels for the RSP there.

Roger

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ON5HB
Posts: 19
Joined: Sat Dec 29, 2018 1:07 pm

Re: 60v p-p rf

Postby ON5HB » Thu Jan 17, 2019 1:57 pm

60Vpp = 10Wpeak!!

That is a lot, how close are the AM-stations? You must be about right under their antenna.

Are you sure this is all coming from the antenna? And not between antenna and grounding or such.

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fotoralf
Posts: 22
Joined: Wed Aug 08, 2018 10:13 pm

Re: 60v p-p rf

Postby fotoralf » Thu Jan 17, 2019 7:03 pm

He wrote in the initial post that he gets 60 Vpp at his scope's input, so presumably with a very high load impedance. I suppose that with a load impedance of 50 ohms the voltage would be far lower.

Ralf

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