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7th Nov 2006, 8:34 am | #41 |
Hexode
Join Date: Mar 2006
Location: Helston, Cornwall, UK.
Posts: 303
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Re: Radio earths
Dickie, you could try a tuned counterpoise, I have a similar problem with about 20 feet between my rig and direct earth, I have a tapped inductor tuned by around 500pf variable and this works fine, you should be able to find references on the net.
Tim M0AFJ |
6th Apr 2007, 10:09 am | #42 |
Heptode
Join Date: Jan 2003
Location: Tewkesbury, Gloucestershire, UK.
Posts: 693
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Re: Radio earths
Just come across this thread and thought I should point out the possible dangers of introducing an additional earth connection if your property uses the Protective Multiple Earthing system (as many do).
Worth looking at the following article: http://www.rsgb.org/emc/pdfs/leaflet...ingmembers.pdf Keith
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Keith Yates - G3XGW VMARS & BVWS member http://www.tibblestone.com/oldradios/Old_Radios.htm |
6th Apr 2007, 6:18 pm | #43 |
Retired Dormant Member
Join Date: Nov 2006
Location: Manchester, UK.
Posts: 157
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Re: Radio earths
Yes. My recommendation of the safety capacitor between radio chassis (or radio rf earth) and true 'garden stake' earth still bears true. All AC/DC and live chassis equipment will have one of these by design anyhow (between chassis and the earth jack at the rear of the radio...likewise with the aerial jack unless it's a galvanically isolated design) and that also includes live chassis TVs where the Belling Lee socket outer is isolated on a piece of paxolin.
Any AC only (floating chassis, exposed metalwork) equipment should really be retro-fitted with a proper 3-core mains lead anyhow simply for safety's sake...putting this factor above the desire for an adequate rf/signal earth...even though it wouldn't have been done like this new, insulation gets old you know! Water & gas pipes and radiator earths are now specifically outlawed by IEE regulations as a means of providing a Protective Earth Conductor. |