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Bad reception

Discussion in 'Electrical Engineering' started by Stephen Gray, Jan 28, 2004.

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  1. Stephen Gray

    Stephen Gray Guest

    Hello.

    I have a normal (i.e. not satellite) T.V. here in the UK that is
    experiencing electrical interference. It only happens at night and as there
    is nothing in the house that only turns on at night, I can only concur that
    the interference is from outside. I've fitted a filter and a signal booster
    but it has made no difference. Apart from getting an electrical engineer
    in, is there anything I can do ? Any equipment I can hire ?

    SPG

    p.s. Apologies if this is the wrong forum.
     
  2. Airy R. Bean

    Airy R. Bean Guest

    Perhaps your central heating is only turned on in the evening?

    Perhaps you don't watch TV during the day?
     
  3. Stephen Gray

    Stephen Gray Guest

    Hello.

    The central heating is on all day and we've watched during the day to make
    sure it's only the evening.

    SPG
     
  4. Airy R. Bean

    Airy R. Bean Guest

    Sorry, then, because a central heating thermostat is usually one of the
    favourites.

    You need to determine where the interference is coming in, is
    it via the mains, via the antenna, or directly. I'd suggest removing
    the signal booster as it's likely to aggravate the problem.

    Could it in any way be a failing at some internal part of the TV?
     
  5. Stephen Gray wrote on Wednesday (28/01/2004) :
    No point in fitting filters, if you don't know what you are trying to
    filter out. No point in boosting the signal, if your signal is already
    strong. The booster would also amplify both the signal and the noise.

    The only way is to find the source and fix it. Is the interferance
    constant, at a constant level or does it vary? Try turning everything
    off in your home except the TV. If that fixes it, then turn things back
    on until the problem returns. Try a battery powered portable TV, to see
    if you still see the problem, if so it is likely mains bourne. It might
    also be a fault in your TV.

    Can you hear interference on a portable radio? Take a walk round your
    local area with the radio to see where the noise appears to be loudest.

    Finally (assuming you are in the UK), if all else fails, then get in
    touch with OFCOM, who recently took over the duties of the
    RadioCommunications Agency (RA). They do though often charge a fee of
    around £60.
     
  6. SQLit

    SQLit Guest


    I had this problem recently with my cable connection. Did not effect the
    high speed internet but every night about 7 pm the snow on the screen would
    start until it was almost unwatchable. Only on my big screen and it is the
    closest to the cable box out side.

    I suggest you remove all your filters and boosters. I suggest you check to
    see if the incoming cable lead from the antenna and antenna is grounded. If
    so replace the lead from the antenna to the TV. That is what I finally did
    and it solved the problem.

    You could have a ham radio near by. Look for large antennas on the roofs. or
    maybe a crank up one in a back yard.

    I hope this leads you to a solution.
     
  7. Brian Reay

    Brian Reay Guest

    You haven't described the interference- if you could that may help a
    diagnosis.

    Also, are you in a built up area (ie other houses close by) or are you miles
    from any neighbours?

    --
    73
    Brian
    G8OSN
    www.g8osn.org.uk
    www.amateurradiotraining.org.uk for FREE training material for all UK
    amateur radio licences
    www.phoenixradioclub.org.uk - a RADIO club specifically for those wishing
    to learn more about amateur radio
     
  8. sammmm

    sammmm Guest

    don't happen to have a local citizens band or ham radio guy?
    the hams will probably work with you if it's really a problem with their
    radio.
    not sure about the CBers. 50 mhz or so is the biggest problem..
    i really don't know what the channel arrangements are in the UK.
    good luck, sam
     
  9. Airy R. Bean

    Airy R. Bean Guest

    In fact, the worse thing you could have near you
    is known as an "M3" licensee. These people are so ignorant
    that they are regarded by real radio hams as nothing
    more than jumped-up CBers, and for this reason
    they are known as , "M3/CB Fools Licensees".

    These are people who have been given Ham Licences
    without first having proved any technical capability. If
    one of these is giving you the trouble, then you're on your
    own! (Regrettably)
     
  10. Airy R. Bean

    Airy R. Bean Guest

    Is it possible that you have a digi-box coming in via
    a co-ax (and not a Scart) and the output frequency has been
    set close to Channel 5?
     
  11. Airy R. Bean

    Airy R. Bean Guest

    ......and does the interference decrease with increasing time?
     
  12. Stephen Gray

    Stephen Gray Guest

    Thanks to all the replies - I'll check everything suggested.

    Regards

    SPG
     
  13. Grunt

    Grunt Guest

    Perhaps you live near this fellow?
     
  14. Chrissy B

    Chrissy B Guest

    I had the same problem for months........Ended up being a guy down
    the street with a CB radio and a huge power amp.

    He would not budge on his power output, so i ended up moving to
    Sky tv, just to get a reception at night....

    wish there was some sort of law for this thing.

    Chris.
     
  15. Stephen Gray

    Stephen Gray Guest

    There is. It's called OFFCOM and they will check the interference and do
    something about it. www.offcom.co.uk apparently.

    SPG
     
  16. There is - the RA (or Ofcom now) should investigate this for you, and if
    it really is a CBer with a huge power amp he would be prosecuted (power
    amps are not allowed on the CB bands). If it is an amateur radio
    operator, he could be prosecuted and/or have limitations placed on his
    licence to prevent him using the frequencies/powers that are causing
    interference. In any event, a radio operator should not be causing you
    interference, and you can get the authorities to back you up on this -
    especially if he is causing problems for other neighbours too.
    How well this will go down with your neighbour is a matter for you to
    decide - it isn't unknown for this kind of thing to cause vendettas.

    Matt
     
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