VHF Trap/Filter? Greenville, SC - AVS | Home Theater Discussions And Reviews
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Old 12-27-2012, 07:31 PM - Thread Starter
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I know there are FM Traps, but I want to block all VHF signals. Would using a Holland UVSJ with the antenna connected to the UHF port do the trick? At least significantly attenuate the VHF and FM signals from Paris Mtn? Or is there a better VHF filter? The SCETV signal on RF9, RF7, and several FM signals do not need to be amped, as they may overload the tuner and may block some more distant UHF signals which do need to be amped just a bit.. I use a UHF antenna but it also receives strong signals on RF7, and RF9, and also gets RF13 but a bit weaker. I only want to receive UHF signals on the amped UHF antenna, and will use a separate unamped VHF antenna for RF7 and RF13. I would place the VHF filter between the UHF antenna and the preamp to reduce the VHF/FM signals from being amped. Please recommend a better VHF filter if there is one.
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Old 12-27-2012, 08:03 PM
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Using a UVSJ between the UHF antenna and the preamp will attenuate the VHF signals a lot. The UHF-to-common section is a highpass filter. I think it's worth a try.

I don't know of any other readymade filter for the job. It is alway possible to put two of them in series for even more VHF attenuation. If that doesn't do it, there is alway a custom filter from Tinlee in Canada.

What does your tvfool signal report look like, something like this?

http://www.tvfool.com/?option=com_wrapper&Itemid=29&q=id%3dcc493e5e943249

If you are 6.1 miles from WGGS-TV on real channel 16, it would probably overload your UHF preamp.

If you can not measure it, you can not improve it.
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Old 12-28-2012, 07:16 AM
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Yes, I have used UVSJ's to block either the UHF or VHF side on several occasions. It almost always takes two in series. Be sure to terminate the unused ports.
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Old 12-28-2012, 01:51 PM - Thread Starter
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Quote:
Originally Posted by Mister B View Post

Yes, I have used UVSJ's to block either the UHF or VHF side on several occasions. It almost always takes two in series. Be sure to terminate the unused ports.
Thanks for your responses. That's what I thought but wasn't totally sure. And I think attenuating SCETV on RF9 seems to help, as I get a stronger signal from them than RF16.
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