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#1
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Correct cable for 920Mhz Mobile, Yagi
Please could somebody tell me the best cable (compromise between cost
and loss) for use with an external Yagi antenna connected to a mobile phone. I live in a Very poor reception area, and I need to fit an external antenna. I have found somewhere that sells 10 element Yagi's, and I can mount the thing as high as need be, but I read somewhere that the longer the connecting cable, can negate the benefits of long mounting poles. I have freinds in the surrounding area that have the same problem, so I could do with a "rule of thumb" that I can use for fitting these things. The shop where I got the antenna from is offering me RG58 cable for this purpose, which is cheap enough, but is it the best compromise for what I am trying to achieve? Your assistance would be most welcome. Mark |
#2
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I cannot recommend a specific cable. But I will say that RG58 is 100%
non suitable for use at 920 MHz! RG58 has very high loss and even 100 feet at 920 MHz will loose about 96% of the received signal [-14 dB]. RG8 or RG11 will loose about 1/2 of the received signal. RG8 or RG11 will cost about $0.50 [USD] per foot. Good quality connectors will have to be used. Mark wrote: Please could somebody tell me the best cable (compromise between cost and loss) for use with an external Yagi antenna connected to a mobile phone. I live in a Very poor reception area, and I need to fit an external antenna. I have found somewhere that sells 10 element Yagi's, and I can mount the thing as high as need be, but I read somewhere that the longer the connecting cable, can negate the benefits of long mounting poles. I have freinds in the surrounding area that have the same problem, so I could do with a "rule of thumb" that I can use for fitting these things. The shop where I got the antenna from is offering me RG58 cable for this purpose, which is cheap enough, but is it the best compromise for what I am trying to achieve? Your assistance would be most welcome. Mark |
#3
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RG-58 ??
You might as well bury the antenna in the ground !! That is the worst stuff you can use. First, How long a run do you need ? Second, What is the connector required on each end ? 73, Dick, W1KSZ On Sat, 25 Jun 2005 11:19:42 +0200, Mark Mark@ wrote: Please could somebody tell me the best cable (compromise between cost and loss) for use with an external Yagi antenna connected to a mobile phone. I live in a Very poor reception area, and I need to fit an external antenna. I have found somewhere that sells 10 element Yagi's, and I can mount the thing as high as need be, but I read somewhere that the longer the connecting cable, can negate the benefits of long mounting poles. I have freinds in the surrounding area that have the same problem, so I could do with a "rule of thumb" that I can use for fitting these things. The shop where I got the antenna from is offering me RG58 cable for this purpose, which is cheap enough, but is it the best compromise for what I am trying to achieve? Your assistance would be most welcome. Mark |
#4
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This may well be an application for a passive repeater.
2 yagis back to back one aimed at the nearest tower the other aimed at your house. mount it high "Mark" Mark@ wrote in message ... Please could somebody tell me the best cable (compromise between cost and loss) for use with an external Yagi antenna connected to a mobile phone. I live in a Very poor reception area, and I need to fit an external antenna. I have found somewhere that sells 10 element Yagi's, and I can mount the thing as high as need be, but I read somewhere that the longer the connecting cable, can negate the benefits of long mounting poles. I have freinds in the surrounding area that have the same problem, so I could do with a "rule of thumb" that I can use for fitting these things. The shop where I got the antenna from is offering me RG58 cable for this purpose, which is cheap enough, but is it the best compromise for what I am trying to achieve? Your assistance would be most welcome. Mark |
#5
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On Sat, 25 Jun 2005 21:20:35 GMT, "Richard W. Solomon, W1KSZ"
wrote: RG-58 ?? You might as well bury the antenna in the ground !! That is the worst stuff you can use. First, How long a run do you need ? Second, What is the connector required on each end ? Each installation will be different, but to use mine as an example, 6 Metre pole, 10 Metres of cable, the antenna connector is a FME and at the phone end I think it is some sort of Sony Ericsson special (looks a bit like a SMC) |
#6
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On Sat, 25 Jun 2005 17:40:50 -0400, "Hal Rosser"
wrote: This may well be an application for a passive repeater. 2 yagis back to back one aimed at the nearest tower the other aimed at your house. mount it high That sounds like a good idea, should I mount the antenna's at a 90o angle relative to each other, with the receiving antenna mounted to look in the vertical plane (I know where the base station is). And the transmitting antenna to give as much horizontal plane coverage as possible, angled down to the areas I wish to receive telephone coverage? Can I expect good results? |
#7
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"Mark" Mark@ wrote in message ... Please could somebody tell me the best cable (compromise between cost and loss) for use with an external Yagi antenna connected to a mobile phone. I live in a Very poor reception area, and I need to fit an external antenna. I have found somewhere that sells 10 element Yagi's, and I can mount the thing as high as need be, but I read somewhere that the longer the connecting cable, can negate the benefits of long mounting poles. I have freinds in the surrounding area that have the same problem, so I could do with a "rule of thumb" that I can use for fitting these things. The shop where I got the antenna from is offering me RG58 cable for this purpose, which is cheap enough, but is it the best compromise for what I am trying to achieve? Your assistance would be most welcome. Mark If you need to stay cheap, use good quality RG 6. We used this stuff at 2000 MHz. You can go to the Belden or Times Microwave web site, and find tables that list the loss of various types of coax at common frequencies. BTW, at 900 MHz, RG6 will have less loss than the fat RG8. If you want GOOD stuff, get LMR400, or 9913. DO NOT get RG58/59/8/8X/8FOAM/213/214. Tam/WB2TT |
#8
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Remember, the high gain antenna will have a narrow beam,
The phone companies have used passive repeaters with good success. "Mark" Mark@ wrote in message ... On Sat, 25 Jun 2005 17:40:50 -0400, "Hal Rosser" wrote: This may well be an application for a passive repeater. 2 yagis back to back one aimed at the nearest tower the other aimed at your house. mount it high That sounds like a good idea, should I mount the antenna's at a 90o angle relative to each other, with the receiving antenna mounted to look in the vertical plane (I know where the base station is). And the transmitting antenna to give as much horizontal plane coverage as possible, angled down to the areas I wish to receive telephone coverage? Can I expect good results? |
#9
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Could you provide any references to the successful use of passive
repeaters? I tried it once and it was a flop. Bob W8ERD In article , "Hal Rosser" wrote: Remember, the high gain antenna will have a narrow beam, The phone companies have used passive repeaters with good success. "Mark" Mark@ wrote in message ... On Sat, 25 Jun 2005 17:40:50 -0400, "Hal Rosser" wrote: This may well be an application for a passive repeater. 2 yagis back to back one aimed at the nearest tower the other aimed at your house. mount it high That sounds like a good idea, should I mount the antenna's at a 90o angle relative to each other, with the receiving antenna mounted to look in the vertical plane (I know where the base station is). And the transmitting antenna to give as much horizontal plane coverage as possible, angled down to the areas I wish to receive telephone coverage? Can I expect good results? |
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