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Article #5140Re: Descramble Cable Using Filter?
From: freeman
Date: Tue, 10 Jul 1990 07:12
Date: Tue, 10 Jul 1990 07:12
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About 10 years ago, our local cable Co. jammed HBO by putting a narrow interference signal in the middle of the Channel 4 video. Picture was wavy, audio was clean. They installed band-reject filters in your line to remove (about 95% of) the noise if you paid for the service. Anyway, we made some cheap "HBO Boxes" out of 300-ohm twin lead cable. We'd simply cut the twin-lead to about 1/4 wavelength and hang it off the VHF antenna input screws. If that got us close, we'd wrap aluminum foil (a strip maybe 2 inches wide) around the twin-lead, and slide it up and down to tune out the noise. For what we paid, it produced a watchable picture. I think that was before spectrum analyzers were invented. |^) MarkJ freeman@eola.ucf.edu
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arc1-ca.pugleaf.net!utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!rpi!crdgw1!ge-dab!tarpit!ucf-cs!eola!freemanReferences:
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!rpi!crdgw1!ge-dab!tarpit!ucf-cs!eola!freeman From: freeman@eola.UCF.EDU Newsgroups: sci.electronics Subject: Re: Descramble Cable Using Filter? Message-ID: <6900012@eola> Date: 10 Jul 90 07:12:00 GMT References: <3525@umbc3.UMBC.EDU> Lines: 16 Nf-ID: #R:umbc3.UMBC.EDU:-352500:eola:6900012:000:735 Nf-From: eola.UCF.EDU!freeman Jul 10 03:12:00 1990