SWL longwire antenna

Useful information regarding antennas for SDR products.
Posts: 4
Joined: Fri May 27, 2016 2:09 pm

Re: SWL longwire antenna

Postby Jon_G4FUT » Fri Jun 17, 2016 6:15 pm

I live in "Sheltered Accommodation for the Elderly" which is one of 16 apartments. I am on the second floor and my antenna is a bit of wire, about 60 feet long, thrown over the roof and few with about 5 feet of coax to the window into a 9:1 balun. Works great (well good enough for me :) ) on both TX and RX, SDRplay uses the same antenna. Highest point is about 25 feet, (the apex of the roof) over ground level. of course I need to use an ATU to match the different frequencies, but often the SDRplay is just attached to the antenna, bypassing the matching unit.
Last edited by Jon_G4FUT on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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Posts: 112
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Location: Beauvais France

Re: SWL longwire antenna

Postby F1BJB » Mon Jul 04, 2016 8:41 pm

I found that the toroid transformer helps a lot in noise reduction
and avoid having a a long exposed wire straight into the RSP.
I use toroids salvaged from energy saving fluorescent lamps.
Grounding the coaxial near the toroid seems useless in fact it makes a ground loop with the computer power supply ground.
May be with a portable it helps.
Last edited by F1BJB on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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