Static from Antenna

Useful information regarding antennas for SDR products.
illllm
Posts: 53
Joined: Wed Jan 23, 2019 10:26 pm

Static from Antenna

Postby illllm » Thu Jan 24, 2019 11:46 pm

Hi All,

I have a loop antenna mounted outside. Its been very cold and dry these days. Today morning, and multiple times after, i received a static shock when i touched the coax to connect it to the RSP2. Should i be concerned ? Do i have to add some protection from antenna to receiver?

thanks much!
Last edited by illllm on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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Fractal1
Posts: 64
Joined: Sun Feb 21, 2016 6:06 am

Re: Static from Antenna

Postby Fractal1 » Fri Jan 25, 2019 5:24 am

It is unusual to be getting static build up to that degree on a loop, generally random/long wire antennas can generate quite a bit which is always discharged to earth before it gets to the reciever. How is your set up earthed?

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illllm
Posts: 53
Joined: Wed Jan 23, 2019 10:26 pm

Re: Static from Antenna

Postby illllm » Fri Jan 25, 2019 1:46 pm

The loop sits on my balcony. Its earthed to the shield only when its connected ( or when i touch it :o :oops: )

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Mike2459
Posts: 204
Joined: Mon Jul 24, 2017 8:24 pm

Re: Static from Antenna

Postby Mike2459 » Sat Jan 26, 2019 1:28 am

Illllm:

You were likely the source of the static charge!! Unless you wear a pacemaker I wouldn't be too concerned. Unless you are doing work on a circuit, the electronics should be OK too, not a lot of energy stored in these sorts of discharges.

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illllm
Posts: 53
Joined: Wed Jan 23, 2019 10:26 pm

Re: Static from Antenna

Postby illllm » Sat Jan 26, 2019 1:41 am

i think you might be correct. I zap everything i touch in winter.

That being said, do i need to protect the front end from overload/overvoltage ? Would it be okay to use an LNA ?

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Paul
Posts: 294
Joined: Fri Feb 17, 2017 9:52 am
Location: SW UK

Re: Static from Antenna

Postby Paul » Sat Jan 26, 2019 6:52 am

Just a thought...
Do you have any nylon in your floor-covering?

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illllm
Posts: 53
Joined: Wed Jan 23, 2019 10:26 pm

Re: Static from Antenna

Postby illllm » Sat Jan 26, 2019 6:52 pm

The floor is carpet, which is nylon i guess.

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Paul
Posts: 294
Joined: Fri Feb 17, 2017 9:52 am
Location: SW UK

Re: Static from Antenna

Postby Paul » Sat Jan 26, 2019 8:44 pm

Perhaps the cause or crontributor to your static problem (particularly in cold weather Ibieve) - Just walking on the carpet would be sufficient i think.

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arcosine
Posts: 30
Joined: Wed Jan 02, 2019 6:24 pm
Location: 41.678472, -88.051762

Re: Static from Antenna

Postby arcosine » Sat Jan 26, 2019 10:39 pm

Put a resistor to ground, something like 100k ohm . It will bleed the static without affecting the signal. The spark could destroy your sdr.

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Tony
AA9CC

ON5HB
Posts: 91
Joined: Sat Dec 29, 2018 1:07 pm
Location: Heppen - Belgium
Contact:

Re: Static from Antenna

Postby ON5HB » Sun Jan 27, 2019 9:54 pm

Make sure you have the system grounded, even electrical ground is good.
Also, outside at the loop antenna, put a 100 KOhm to 1 MOhm resistor over the 2 poles of the antenna, it will discharge the static to ground....the electrical ground.
I assume you use coax.

If you don't use coax, then take both lines, connect 1 MOhm to them and connect them to grounding, that will remove the static.

Use real resistors and not the modern type ones. You need to old fashion types.

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Greetings,

Bas - ON5HB


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