TV signal splitter
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From: Man-wai Chang to The Door (33600bps) on 23 Apr 2010 08:29 > By capping the unused port with a terminator, that stops signal leakage. > That might be appreciated by your neighbors who are receiving OTA > (over the air) TV signals, while you are enjoying your cable TV. > Capping the port, also meets the matching requirements for coaxial > cables. I have a wall socket with a FM-TV splitter inside. Do I need to terminate the FM port if I only use the TV port? -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and Farce be with you! /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.33.2 ^ ^ 20:29:01 up 19 days 12:21 2 users load average: 1.07 1.09 1.05 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
From: Paul on 23 Apr 2010 08:55 Man-wai Chang to The Door (33600bps) wrote: >> By capping the unused port with a terminator, that stops signal leakage. >> That might be appreciated by your neighbors who are receiving OTA >> (over the air) TV signals, while you are enjoying your cable TV. >> Capping the port, also meets the matching requirements for coaxial >> cables. > > I have a wall socket with a FM-TV splitter inside. Do I need to > terminate the FM port if I only use the TV port? > Well, if you don't have anything to connect to it, leave it open for now. Just try not to leave a long length of open cable off of it. A length of cable, with no terminator on the end, would be a long stub, and the time of flight might be sufficient for the reflection to cause a ghosting of the TV image. I haven't experimented with this stuff, to see how sensitive it is. What I've explained is the theory of transmission lines, where you want the source impedance, line impedance, and termination at the end to match. Such an interconnect appears to a signal, like an infinitely long length of cable, and there should not be a reflection off the end. I expect plenty of people leave ports on splitters open, and it could be that the short length of interconnect involved (stub), just isn't long enough to see an effect. My guess is, if you left a long enough piece of wire off one of the ports, with no TV or FM radio connected, maybe then you'd get a reflection. In my case, rather than experiment, I just bought the exact number of ports I needed. So while I could "save money" by buying a three or four port, I chose to buy a two port for the two devices. That way, I wouldn't have to worry about any open ports, and my inability to buy nice screw on terminators. Paul
From: Man-wai Chang to The Door (33600bps) on 23 Apr 2010 08:57
> Well, if you don't have anything to connect to it, leave it open > for now. Just try not to leave a long length of open cable off > of it. A length of cable, with no terminator on the end, would be > a long stub, and the time of flight might be sufficient for the > reflection to cause a ghosting of the TV image. Thanks! -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and Farce be with you! /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.33.2 ^ ^ 20:57:01 up 19 days 12:49 2 users load average: 1.05 1.07 1.07 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa |