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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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18th May 2020, 5:36 pm | #21 |
Tetrode
Join Date: Jan 2008
Location: Shetland, UK.
Posts: 79
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Re: Feeder prior to 1950 or 1940
I was given a reel of cable in the mid 1980's by a Shetland radio amateur who was a V.I. and latterly seconded to the RAF during WW II. The cable is a twin insulated feeder enclosed in high grade copper braid. This feeder along with a RG213 coaxial cable goes under a road to my antennas some 70 metres from my station. The twin feeder from my 80m delta loop is tuned via a Z-match in the station tuning from 80m. to 10m. I have never had any need to replace the feeder system, working a large number of dx stations all over the world.
Last edited by gm0ekm cecil; 18th May 2020 at 5:47 pm. |
1st Jun 2020, 11:56 pm | #22 |
Pentode
Join Date: Jun 2009
Location: Braintree, Essex, UK.
Posts: 170
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Re: Feeder prior to 1950 or 1940
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2nd Jun 2020, 2:45 am | #23 | ||
Dekatron
Join Date: May 2006
Location: Invercargill, New Zealand
Posts: 3,458
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Re: Feeder prior to 1950 or 1940
Quote:
Quote:
The first UHF broadcasts were one or two of the regional TV3 transmitters, then Sky's first UHF VideoCrypt service on three channels. I upgraded my parents' place to coax around 90 or 91, just after TV3 started off Hedgehope, with a Dick Smith "air spaced" coax. When it first came on-air they still had a 3 element channel 1 aerial with the director cut down in the mid 70s so it gave reasonable reception of TV2/South Pacific on channel 3. It was no good on channel 7 for TV3, so dad replaced the aerial, then I replaced the feeder. A couple of rooms were still fed by ribbon when I left for university - I only cabled up to the lounge and my bedroom, putting one of the obsolete plug-in baluns backwards in the ceiling to feed the old system. |
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5th Jun 2020, 10:11 am | #24 |
Octode
Join Date: Feb 2009
Location: Bletchley, Buckinghamshire, UK.
Posts: 1,223
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Re: Feeder prior to 1950 or 1940
I have found the following page, which may be of interest, in an old Telcon catalogue dated 1950:
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5th Jun 2020, 10:34 am | #25 |
Dekatron
Join Date: Jul 2008
Location: Charmouth, Dorset, UK.
Posts: 3,601
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Re: Feeder prior to 1950 or 1940
I use twin feeder on my main HF amateur radio antenna. Its a dipole about 150' in length centre fed with 300 ohm feeder and a 4-1 balun on the input to the ATU. It will tune up well on most bands but any problems can usually be cured by shortening or lengthening the feeder.
I also have a 'holiday' 40m approx dipole made from twin flat blue telephone wire, the cable was split to give around 20m overall and the rest of it being used as the feeder. With an old 'Easymatch' tuner it gives pretty well spot on SWR on 20, 40, and 80m Peter |