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Post by leprena on Aug 30, 2009 11:31:22 GMT
Hi everyone, I am going to install a Bi-Directional aerial up the mast and run the cable down the mast and into the cabin. Here is where the problem starts. I am familiar with going up and down the mast, but how do I get a new cable down the mast and somehow retrieve it @ the base after drilling a new hole @ the base of the mast. Does anyone know anything about remote aerials without cables? Are they expensive?
Cheers Mike
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Post by sailbleu on Sept 14, 2009 9:25:33 GMT
Hi leprena, maybe a bit late to react but here's a possibility. Drop a thin line with a little weight (bolt , screw or nut ) down the mast. Get someone to listen to the sound of the weight touching the deck (or mark the lenght of the mast on that thin line ) and have that same person grab that line with a small hook through the drilled hole in the base of the mast . You can fill in the rest no ?! Greetz
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Post by so40gtb on Sept 26, 2009 3:24:12 GMT
Mike,
My day job is the principal transmission facilities engineer for 41 TV stations in the US.
Be assured that you are best off with a direct coaxial cable connection from antenna to receiver. Also ensure that the dimensions of the receiving antenna are proper for the channels (frequencies) you desire to receive (UHF in the UK). While mast removal during winter haul-out would best facilitate your project, the post above presents a reasonable approach that might well reach fruition of connection without excessive frustration.
Lastly, TV transmission is primarily horizontally-polarized in most parts of the world. Make sure that your receiving antenna is similar. Vertical polarization (e.g., VHF communications) is only effective for TV reception if the transmitting antenna is vertically or circularly polarized. Even then, it has statistical variability greater than that for horizontal polarization. Most of the stations I oversee have elliptical transmission polarization, with vertically polarized power from 15 to 30 percent of horizontal. European facilities tend to be horizontal only. So horizontal polarization in the receiving antenna is best, both from transmit-side-compatibility and wave propagation-theory p/o/v.
-- Karl
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Post by paulhille on Oct 8, 2009 19:45:28 GMT
Mike, best way to get a new coaxial thru, pick a light guage wire from something else there, say a light, attach 2 electrical drop strings( they are like strong ribbon) to it and pull the wire down. Leave one drop string tird at the topand bottom for future use, and use the other to pull up the new coaxial and the new( or old wire you pulled down. Electrical pull string is easy to come by, and cheap. Red
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Post by joker64 on Apr 4, 2010 11:57:56 GMT
In the construction world, it isn't unheard of to place a vacuum cleaner at the hole at the other end of a conduit (hole at the bottom of a mast), and suck the electrical drop strings though. Just an idea.....
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Post by yachtsea on Apr 4, 2010 16:10:42 GMT
Best I have found is to use a small length of bicycle chain tied to a drag line. The chain will be flexible enough to pull thru any hole of mast.
Gary DS 50 #100
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