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Showing results for tags 'omnidirectional'.
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Hi pissed off with having to erect TV aerial every night trying to locate mast for best signal getting nagged at by bread knife because she missed her favourite program Then every morning having to take it down and stow it I am looking at this ballade super gain and am asking if it’s any good It looks ok and I can mount it on a pole in deep valleys but would be nice if I could just mount it on the roof and forget it being 70 and a danger to myself as we in doors keep telling it would be ideal thank you in advance Rich
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The following is my recently fitted Narrowboat TV and radio solution (12 volt supply): A single omnidirectional Glomex antenna feeds a Meos TV and Kenwood car radio at the same time with gain added (via a Glomex gain controller) when reception is difficult or if I can't raise the antenna sufficiently. Questions: Does signal strength reduce each time a coaxial cable is joined? I have 4 joins on mine. Does signal strength reduce significantly with a longer coaxial cable run? Mine is about 60 feet. Roughly how much of the signal is leaked by the coaxial connectors and is it worth buying only gold plated ones? Does it matter much that we have joined 75 Ohm cable to a very short run of inaccessible "pre-existing" (brown) coaxial cable from the boat's analogue TV days? How any mA (typically and very approximately) will my 12V Glomex gain controller draw on full gain? The tech. spec. cites 25 mA but for what I don't know (the gain controller model number is at the end of this post). If you want the background read on....... Thanks, Dr8ton The Glomex omnidirectional antenna is on an extending pole mounted on the outside of my cratch board. Seventy five Ohm cable carries the signal (via a 2-way cable splitter) to a Meos combi TV and to a Kenwood car radio. The total cable run is about 60 feet (though roughly 45 feet is currently coiled up so I can move the antenna about for testing purposes). On the antenna side of the splitter is a 12V Glomex gain controller. Note that my gain controller does not have a by-pass built in so it must be switched on to receive a radio and/or a TV signal. Yesterday I tested the finished system with the boat static on her mooring in a good reception area. After raising and lowering the antenna and messing about with the controller (e.g with the antenna lowered to cabin roof height I need to add about 25% gain) I got a strong signal on all Freeview channels and excellent FM from the radio, even at the same time. Then, as an experiment to test the effect of the cable joins, I simply plugged the Glomex antenna directly into the TV. I found I could lower the antenna completely and even bring it inside the cratch with no significant loss in signal quality. So on the mooring at least I do have this option (i.e. after rigging a gain controller bypass for convenience). That said, my simple experiment suggests that splitting the cable (e.g. to incorporate the gain controller) reduces signal quality. To compensate I wound up the gain (at the expense of mA). Of course this wasn't the point of fitting the gain controller! It's main function will be to help improve poor reception "on the move". Even so, I can't help wondering if splitting the cable to accommodate a gain controller is counter-intuitive, at least in part..... Equipment used: Antenna: Glomex V9125 12/24V Gain controller: Glomex 50023 / 98EC (with on / off switch wired to 12V panel) Cable: 75 Ohm (supplied by Glomex as part of kit) Two-way splitter: Glomex V9147 Coaxial connectors: F type TV: 19" Meos TV/DVD combi 192B (plugged into 12V DC socket) Radio: Kenwood Radio/CD/Aux KDC 24
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- Glomex
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