aerial tv digital reception?

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Anonymous Poster	aerial tv digital reception? 04/12/2010 2:37 PM
	does it make a diff if i amplify the signal @ the antenna or @ the tv? i have 100' of cable & am amplifying @ the tv but some signals fade dependent on weather?
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Tobugrynbak Guru Join Date: Oct 2008 Location: Deepest Darkest Rutherford Oz Posts: 951 Good Answers: 145	#1 Re: aerial tv digital reception? 04/12/2010 4:21 PM
	If you put an amplifier at the antenna you will have more success at improving the signal. Where as when the amplifier is at the tv, you amplify the noise as well as the signal. Your 100' of cable has reasonable amount of signal loss which will create the noise in the signal. Unlike Analogue TV (and digital radio for that matter) the Digital TV signal is very fragile in comparison and relies on a good solid signal from the transmitter to be viable. That's ok in an urban area but outer fringe suburbia it becomes a challenge. General rule of thumb is that if you were in a metro signal area before( with Analogue TV) now you are in a fringe area. You can extrapolate that to your situation. __________________ There are two reasons for a man to do a thing, One that sounds good, and the real one...
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peterg7lyq Guru Join Date: Jan 2010 Posts: 2446 Good Answers: 60	#2 Re: aerial TV digital reception? 04/13/2010 1:13 AM
	ideal situation with long cable lengths is to boost signal at antenna first then possibly TV end, if not the loss of signal from attenna introduces interference, also i would suggest you get a higher gain antenna first, make sure down cable is 75 Ohm cable And not 50 Ohm 50 Ohm is only really used for communications equipment. standard TV coax is 75 Ohm if you use wrong type there will be massive losses of signal. good luck
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#3 Re: aerial tv digital reception? 04/14/2010 12:01 PM
	The other thing is make sure the antenna impedance, the cable impedance and the input impedance all match. Connecting a 75ohm-characteristic down-lead to a 300ohm-characteristic antenna directly will result in much signal loss, for example, at the connection point. Impedance matching transformers are the ideal solution to signal loss, being readily made for television frequencies, needing no power and being as 'cheap as chips'. For the 300-75ohm impedence-matching situation, such a device might be referred to as a "balun". __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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peterg7lyq Guru Join Date: Jan 2010 Posts: 2446 Good Answers: 60	#4 In reply to #3 Re: aerial tv digital reception? 04/14/2010 12:18 PM
	Hes right you know
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SSCpal Guru Join Date: Oct 2006 Location: MSP, MN Posts: 728 Good Answers: 8	#5 Re: aerial tv digital reception? 04/20/2010 6:10 PM
	What cable? Use RG6 quad-shield or RG11. Do not use RG59, it is only partially shielded. Before using an amp, make sure you have the best antenna for the job. Try this site: antennasdirect.com. They have good tech support. And if you do need an amp, put it at the antenna end.
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