Is it over kill toshield your RF ground if its far away?

Useful information regarding antennas for SDR products.
bubblegumpi
Posts: 49
Joined: Fri Oct 14, 2016 11:41 pm

Is it over kill toshield your RF ground if its far away?

Postby bubblegumpi » Sun Oct 16, 2016 5:19 pm

I like listen to short wave on my SDR with a wire antenna. heres the thing my radio is on the second flood and to get a wire to the ground rod it must pass across a room (20 feet) then put the windown then down about 20 more feet. I do have a whole bunch of extra coax that I found some where. Is it ok to just run a wire this long distance to the ground rod? Thats like a 40+ foot length and I'm afraid it will become a noisy antenna. I could hook the center of a coax cable to the ground, run it into the house across the room and then ground my radio with it. Over kill or a good use of this huge pile of coax I have?

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F1BJB
Posts: 108
Joined: Wed Jul 15, 2015 4:24 pm
Location: Beauvais France

Re: Is it over kill toshield your RF ground if its far away?

Postby F1BJB » Mon Oct 17, 2016 9:46 am

Hi
Where would you connect the shield of your shielded ground ?
To avoid ground loops between the AC plug/USB ground and the RF ground on HF receive aerials.
I use small toroid transformers made with toroid core salvaged from energy saving lamps .
They are located at the base of vertical antennas or in the middle of dipoles.
As a bonus some kind of impedance matching can be achieved by adjusting the turns ratio.

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