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Timed Interference?

Discussion in 'Electronic Repair' started by Ron, Oct 23, 2007.

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  1. Ron

    Ron Guest

    Lately we have ben getting a lot of noise on channels 5 & 6, usually
    at certain times of evening and night; almost never during the day.
    This interference usually lasts about fifteen minutes, then cuts off.
    Is this something caused by my neighbors? Can I call the FCC to track
    it down? It's really fucking up my videotapes.

    Ron
     
  2. Smitty Two

    Smitty Two Guest

    No, the FCC doesn't care. You're on your own.
     
  3. Yukio YANO

    Yukio YANO Guest

    Channel 5 /76-82 Mhz corresponds with the Third harmonic of 25.33-27.33
    Channel 6 /82-88 Mhz corresponds with the Third harmonic of 27.35- 29.33

    This would seem to match the legal 26.965- 27.405 CB frequencies and
    illegal operations beyond 27.405, usually ~27.555 - 27.755/ 82.665- 83.25
    Considering that we are at the bottom of the 11 year Sunspot Cycle it is
    unlikely that you are dealing with "Skip" communications.

    The timing, would correspond with a 9-5 worker, and does it use the
    radio most often on the weekends ??

    Are you not on CABLE ??? in the 21 Century !
    As I understand it the FCC will Terminate Analog TV Service in about 14
    months anyway !!

    Yukio YANO
     
  4. The FCC will send you a color broshure detailing several mostly
    useless options. Basically, unless you can identify the source, and
    they're obviously in violation of some rule or reg, you're on your
    own.

    Best bet is to identify the source of intereference with a directional
    antenna and a portable spectrum analyzer. If that's too messy, try
    running around the neighborhood with a battery operated TV receiver
    and look for the strongest areas. It's going to be quite a rush
    because you only have 15 minutes to find the source.

    Assuming you're talking about over the air channels, and not cable or
    satellite channels:
    CH 5 76-82 MHz
    CH 6 82-88 MHz
    Hmmm, you probably can also hear it at the bottom of the FM broadcast
    band.

    With the information you've supplied, I can't even begin to speculate
    what the RF source might be. A 15 minute single run in the evening
    kinda sounds like a microwave oven cooking dinner. However, those
    operate a 2400MHz and are unlikely to cause problems on TV ch 5 and ch
    6.

    "Certain times of evening and night" implies that you know those
    times. Could I trouble you to disclose them? Also, any particular
    pattern on the TV screen?

    Anyway, if you don't have the equipment or transmitter hunting skills,
    try asking for help from the local ham radio operators.

    Incidentally, video tapes are kinda like old technology. You might
    want to look into recording the shows on a hard disk with a DVR, or a
    DVD burner.
     
  5. But that won't solve the interference problem.
     
  6. Complain to the FCC about the quality of your videotapes. Dumbass.
     
  7. Smitty Two

    Smitty Two Guest

    Correction: Even if you can identify the source, you're on your own. My
    neighbor at work uses a 6000 watt amp on his CB radio. He talks to
    people halfway across the country when the atmospheric conditions are
    right. Yes, it interferes with things in our shop.

    I called the FCC. They said they don't have the time or manpower to
    track down violators. I said, no tracking down needed. I'm next door. I
    know the name, the address, the phone number. They said, well, go talk
    to him yourself. We don't enforce things like that.
     
  8. Of course not. It also won't balance the budget, end hunger, or
    supply the meaning of life. That's why I added it at the end and
    prefixed it with "incidentally", which means it's not directly
    relevant to the problem at hand. I've been slooooooly transcribbling
    my VCR tapes to DVD and donating my VCR's to the thrift shops. The
    local rental places hardly have any VCR tape on the shelf. While not
    totally dead, VCR tapes show all the signs of impending obsolescence
    and may soon take their proper place along with reel to reel, vinyl
    disks, and wax cylinders.

    Incidentally, I do some wi-fi interference hunting and have learned a
    few things from the exercise (literally). Besides direction finding
    being somewhat of an art instead of a science, knowing the
    characteristics and timing of the interference will often point
    directly to a culprit. That's why I asked for better time of day
    information.
    <http://wireless.wikia.com/wiki/Wi-Fi#Interference>
    These are not applicable for ch 5 and ch 6 interference, but offer
    some clue as to what is out there.

    I kinda like the image of a high power CB transmitter. The problem is
    that a 15 minute "broadcast", with no back and forth tx/rx exchange,
    doesn't really sound like the typical CB user. I would expect
    something like 30-60 second or less transmissions, with perhaps an
    equal time to receive in between. This would go on all evening.
     
  9. All too true and correct. From recent experience, the FCC will do
    nothing unless either the correct politician is involved, or that it
    involves national security (terrorism). We were getting inteference
    from fishermen operating "modified" marine, ham, and commerical
    radios. When in the area, they would severely interfere with local
    ham repeaters. The FCC did nothing. However, at one point, they
    landed on one of the channels used by the local sheriff. Suddenly,
    there was interest, action, etc. The result was one person in a van,
    shows up in the middle of the afternoon (when the fishermen were not
    active), does 30 minutes of listening, doesn't hear a thing, and turns
    around to go back home. Upon investigation, it seems that he was only
    allocated enough funding by Dept of Homeland Security to make the one
    afternoon trip. So much for the war on terrorism.

    I have other other horror stories, but that aformentioned is the most
    recent. Not only does enforcement require politics and terrorism, but
    money is also a great inducer. The FCC does not directly enforce a
    "notice of apparent liability" (which incidentally is forfeiture
    without a trial). That job goes to the justice department, which
    simply isn't interested in collecting fines that cost more to collect
    than they collect. So, the FCC has gone on a concientious program of
    ever increasing fines, sufficient to get the attention of the supremes
    on charges of "cruel and unusual punnishment". The JD is not going to
    collect a few thousand from your neighbor, when they can go after
    broadcasters and cellular providers, that take in millions. See the
    amount of the fines at the FCC Enforcement Burro web pile:
    <http://www.fcc.gov/eb/>
    <http://www.fcc.gov/eb/FieldNotices/>

    Anyway, tell your neighbor that the feds monitor home electrical usage
    and that anyone using unusually large amounts if probably growing
    drugs indoors. Also, tell him that he's running an "alligator".
    That's a radio that has a big mouth and small ears. It helps if you
    speak the language.
     
  10. Ron

    Ron Guest

    Hmmm, I can get 8 hours on a single videotape; what can I get on a DVD
    disk? One hour of recordings at most, if I had seen rightly the last
    time I was at Target. Not even comparable... So I think I'll wait
    till the new tehnologies catches up with the old. :)

    As for the time issue, I don't have a schedule of times, just that the
    problem is intermittent from around 6:30 to 10:30 PM, with no problems
    before then and none after those hours, but nothing like clockwork.
     
  11. <http://www.madhousebeyond.com/?mode=docview&view=vhsdvd>
    Length of video DVD recording mode
    Under 1 hour HQ mode (60 minutes)
    Around 90 minutes SP mode (120 minutes)
    Around 2 hours SP+ mode (150 minutes)
    Up to 3 hours LP mode (180 minutes)
    Over 3 hours EP mode (240 minutes)
    If you have a DL (double layer) DVD burner, double the record times.
    Well, Blue Ray prices are sloooooowly coming down.
    That's a fairly wide range of time for a 30 min microwave oven run,
    but still possible. Good luck.
     
  12. Gary Tait

    Gary Tait Guest

    You can get at least 20 hours on HDD based DVRs.

    If you have OTA, the lates TiVo does anout 160 hours at its basic mode for
    analog SD, plus can tune digital/HD channels, although it sosts about $200,
    and has a monely fee.
     
  13. Guest

    In 16 months it will not matter as the analog TV transmitters will all
    be turned off permanently. I've been using digital TV for almost 4
    years now and I can't imagine dealing with NTSC ever again -- and I
    work in a video post house. True, no tape based VCRs but certainly
    recorders based on hard disks of which I have 3 units (PCs), often all
    3 running to capture HD shows for later - MUCH later as in next
    summer. No reruns at our house.

    No ghosts, smears, ringing, noise (except for film grain), 5.1 audio.
    Bulk storage? I'm using 500 gig USB drives ($110 Fry's) to hold
    archived shows -- about 120 42 minute shows in HD (commercials
    removed) per drive. 4 times that in std def. 20 years ago Bill Gates
    told us TV would be centered on PCs and I thought he was full of it. I
    was wrong. Time to take the plunge - the water's great.

    GG
     
  14. James Sweet

    James Sweet Guest


    I quit watching TV alltogether years ago and don't miss that waste of time,
    however for millions of consumers the changeover will be quite a hassle.
    Even if the converter boxes are cheap, you still need a new antenna and
    those aren't, nor is installing one trivial for everyone. Cable and satelite
    customers will essentially be unaffected, but there's a lot of people in
    rural areas throughout the country who don't have that luxury.
     
  15. Guest

    Negative on the antenna. If your old one is good with analog, it will
    be fine with digital. The spectrum is the same for digital and analog.

    GG
     
  16. hi, dont know what software u using, but i can get eight , 45 minute
    episodes on one dvd.
    also , how on earth can u say , one hour at most ???? when most movies that
    are on dvd are always longer than 1 hour.
     
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