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Tool Talk Discussion Forum

Re: Amplified TV Antennas?

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Author  [Modern View]

01-10-2014 06:45:30

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An FM trap on the antenna pre-amp is vital. FM radio stations will wipe out channels 2-6 and overload the tuner on CH 7-69.

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01-10-2014 07:10:57

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 Re: Amplified TV Antennas? in reply to buickanddeere, 01-10-2014 06:45:30  
I'm not convinced that is true anymore. Since the FM band got stolen from Mr. Armstrong - it is inbetween VHF low and high and used to cause a lot of problems with analog TV tuners. Not so sure anymore with digital tuners and their advanced selection and rejection. FM used to cause a lot of "herringbone" interference on TVs during the analog days. With digital, it would just cause signal rejection (I guess). So far, I've tested at three different sites with 10 different antennas and four different amps. I haven't found any degradation yet due the FM band. That includes VHF low, high and UHF.

I can say for sure that at my place in NY - I get two RF channel 7s (Utica WXXA and Binghamton WBNG) and RF channel 6 (WRGB from Albany. They are all weak "fringe" channels and using the FM trap on the preamp makes absolutely no difference. The co-channel thing with two channel 7s is more of a problem.

In northern Michigan - same results. I've got weak distant signals for RF channels for 8 (WGTQ), 10 (WWUP) and 11 (WBKB). I also get analog channel 3 from Ontario, Canada (CICI). Again, they work the same with the FM trap on or off. But I do have all modern TVs. All my preamps have switchable FM traps. Channelmaster CM777 and AntennaCraft 10G222.

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01-10-2014 09:20:33

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 Re: Amplified TV Antennas? in reply to jdemaris, 01-10-2014 07:10:57  
I used to receive analog then digital across Lake Huron from Michigan until the local 98 The Beach set up their broadcast tower four miles away. The yagi antenna will null the FM half decent when aiming for Flint and Saginaw. Unfortunately the FM transmitter is inline with the antenna tail for Detroit and the head while aiming for Apena or Saulte Ste Marie. Ice wrecked the antenna last March for the next unit will be a CH 7-69 . Need a new amp with the FM trap and maybe new RG-6 cable. The existing has been in service for 15 years. It should at least be meggered to find shorts or moisture.
Just too much FM power, too close.

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01-11-2014 06:08:55

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 Re: Amplified TV Antennas? in reply to buickanddeere, 01-10-2014 09:20:33  
My longest run is 1000 feet (antennas to house) and I wound up using RG11, along with a line "booster" amp at the half-way mark. The rest is RG6 which is cheap when bought in bulk. Home Depot even stocks it in reels.

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