Questions about a roof mounted antenna for TV
prairiemoon2 z6b MA
8 years ago
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donbren78
8 years agoUser
8 years agoRelated Discussions
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Comments (14)Follow up to above. I did ask on another forum about simply using linking into my internet cable feed. Here was the reply. Original Quote... "Albert, are you going to be getting cable internet? If so, skip the antenna and just (using a basic cable splitter) run one wire to your cable modem and the other to your TV. If you have a newer TV with a digital tuner, you'll get all the OTA channels for free, in HD. And then some. I sent our new OTA antenna back to Amazon once I figured that out. Good luck!" My Question at the other forum.... "What about that? True with caveats? Just his imagination? If true, why did I not find any "heads up" regarding the possibility of this during all of my research concerning OTA antennas and reception? Thanks for all your help here." Member's response.... "Partially true with caveats. Often times cable companies just neglect to block the "broadcast basic" when you sign up for internet. "Broadcast basic" by law includes all local full power stations for your DMA. Often times they are in HD and there are requirements that they be in HD if broadcast in HD (I don't know how that works since when I stayed in Philly, the local CW, that I know broadcasts in HD, was only SD on the hotel's pay service.). Broadcast basic service often doesn't include multi-cast channels, (i.e. you don't get the dot 2, dot 3 etc. channels) and the cable companies degrade the HD to save bandwidth (the picture isn't as clear and has a lot more compression artifacts). Also, if you're in an area where you can get out of market stations on your antenna, you won't get those with broadcast basic (I'd lose 50% of my channels if I signed up for broadcast basic). Finally, the cable companies have petitioned the FCC for, and will probably get, the right to encrypt broadcast basic, so those folks that are getting it for "free" will probably lose it soon."...See MoreTV antennas- mixed results
Comments (3)I have posted your generic TVFool.com report for your location below: it indicated that most of the transmitters are about 30 miles away, in an arc of about 50 degrees to the west. WPFO, your FOX station, however, lies in a different direction, north-northeast of you. You best bet is a small, directional outdoor antenna mounted on the roof aimed in the middle of the spread of your local stations: about 280 degrees, as measured by your compass. I would use an AntennaCraft HBU-22 or a Winegard HD-7694P mounted on your roof, with the lead-in coax cable run to a 4 way distribution amplifier, like a Channel Master CM3414. Run Coax cable from the distribution amp to each TV set. This system will insure uniformly excellent reception on all the TV sets in the house, regardless of their location, and will serve you well for many years to come. You will find that this antenna installation will actually cost you LESS than fooling around with 4 amplifier indoor TV atennas, and will provide much greater satisfaction. Here is a link that might be useful: TVFool.com report...See MoreDigital TV antenna coax connections
Comments (3)First you need to know that a "T connector" (if in fact someone makes a version with F fittings) is not generally used to split a TV cable into two outputs. 99% of the time a "two way splitter" is appropriate. Second, if in fact you have a "four way splitter" under your house, the best way would likely be to use the 4th output for your new set. This way each set will have pretty close to the same signal level. All will see about 7 db of loss(referenced to the splitter input level) plus coax attenuation. Note that a "4 way" splitter actually has 5 connections-input and 4 outputs. Third, if you use a 2 way splitter to do what you describe, your kitchen TV will have the strongest signal since a two way has about 3.5 db of loss per port. You will cut the signal to your other sets in half (down to about -10.5db referenced to the original splitter input level)...See MoreIt's not a TV antenna wire... what IS it?
Comments (8)"Some of the rotor lines could double for RF signals." "Say what?!! I have never, ever heard of this or seen it done. And most certainly could not be done for amateur radio. Rotors since the 60's have typically used 30VAC with two windings and a common from the box to the motor. " The presence of 60 Hz or other power signals (down to DC) on the line has no effect on their use as RF lines. Al you need is a simple network to separate signals at the load end. It is very easy to pull off even kHz RF from 50 Hz ad direct each signal to their respective loads. The bigger problem for RF use is what impedance you have created with the structure of the pairs. For rotor control lines a small value inductor stops the TRF from passing into the rotor controls and motor. A capacitor allows the much higher RF frequency to be coupled on the lines and then coupled off. The bigger problem for RF use is making sure the cable has suitable impedance at RF to allow things to work out correctly. Typical 'twin lead' is 300 ohms, while 600 ohm twin lead is not unheard of. If you had more money you could use coax for the RF line. the required coupling networks are much cheaper than running an extra cable run (especially if home built). this is the same method used for microphones for many years before wireless was high enough quality. A 'phantom DC voltage' was put on the audio lines to power the microphone electronics, and ten easily blocked from the output at the amplifier. All sorts of signals can share conductors. DSL is placed on the twisted pair phone line above the normal audio. This post was edited by brickeyee on Sun, Dec 9, 12 at 12:02...See Moreprairiemoon2 z6b MA
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