I am trying to combine standard NTSC antenna signal with new DTV converter box output. The DTV has a separate special antenna, gets only UHF (we are in outer fringe area). We cannot get any NTSC channels below 6. The DTV converter boxes puts out chan. 3 & 4. I am combining the outputs using a coax splitter (in reverse). It works good except it ruins channel 8.
So I am looking for:
A Low-pass COAX filter approx. 75MHz to allow only channels below 5 to come in from the DTV converter box, to filter out channel 8 interference. I don't know where I might find one of these, I tried radio shack & Newark electronics. Theoretically, if I added such filter between the NTSC DTV converter box output & the NTSC antenna combiner (splitter in reverse), it would block said interference of any channel above 4.
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