Question about Sony FD Trinitron WEGA KV-27FS100 27" TV

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Reception of vhf/uhf channels

I can receive channels up to 13, but i do not get reception for channels above that (i have a combination VHF/UHF antenna connected to the back of the television). How can I receive these higher UHF channels? Hi, I can get uhf channels 38 and 56, but uhf channel 25 comes in as 'no signal'. This just happenned recently, and we don't understand why. The menu is set to 'cable off' (we have an antenna instead). We have re-run the autoprogram and 25 is skipped over. We have also tried to manually add the station. BTW, it is a SONY WEGA 27". We bought it used, and haven't had a problem, except for this. Thanks for any help you can give.

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  • mccullog001 Dec 13, 2008

    Up until recently, I was able to get UHF channel 25, now I can't. I can get other UHF channels 56 and 38, etc. Channel 25 comes in as 'no signal'. We are using an antenna instead of cable, and the appropriate switches on the menu are set (ie. - cable off, etc.). We autoprogrammed several times and 25 is skipped over. We tried to manually enter it.

    If the problem is with the tuner card, does that mean it has to be replaced? Is that expensive? Is this something we can do ourselves? Thanks for any help you can give.


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Hmm looks like a problem because you already scanned the channels and still cant find them..
Go to thi website that will give you all the information about VHF and UHF reflectors and compare prices for you...

Posted on Dec 13, 2008

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If you are able to received the other UHF channels, it could be that channel 25 might no longer be available or has switched to digital.

Posted on Dec 13, 2008

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This seem issue with the tuner card. also check if you can play dvd.

Posted on Dec 13, 2008

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Hello there,

initially when you have done the auto program on the unit, and it skip the channel. it means that there was no reception or no signal was recieve on the highest channel.

it is better to re align or re direct again the antenna in which it will get a high signal or reception.

let me know

Posted on Dec 13, 2008

  • micromaster
    micromaster Dec 13, 2008


    If UHF reception in general is bad, how it's bad can help
    determine the problem. "Snow" is visual noise caused by a weak
    signal. poor antenna system, the set itself, or a combination of these. "Ghosts" or
    multiple images are caused by a signal arriving from two or more directions
    simultaneously reflected off buildings, trees and mountains. A good antenna
    system often solves these reception problems. An outdoor antenna is better
    than an indoor antenna. An indoor antenna is better than no antenna at all.
    If an outdoor antenna is needed for VHF, you'll almost certainly need an
    outdoor antenna for UHF. But if good VHF reception can be obtained with
    and indoor antenna, a loop or other UHF antenna on the set may also work.

    Outdoor Antennas
    There are many different kinds of outdoor antennas available
    in a wide price range. The kind selected is determined primarily by the
    geographic location of the receiver.

    Recommended UHF antennas

    • Four-way bow tie (pictured below) for metropolitan areas with strong signal

    • Eight-way bow tie for suburban areas with medium signal

    Television signals are strongest when the station transmitting
    tower and the home receiving antenna are in line-of-sight. If the line-of-sight
    is blocked or weakened by mountains, buildings or trees, the signal, likewise
    will be weakened or lost. The signal will also grow weaker as it travels

    "Gain" is the measure of an antenna's sensitivity -
    and its ability to pick up signals. It is measured in decibels (dB).
    The farther away from the station tower, the more gain the antenna should
    Gain can also vary from channel to channel. For example, an antenna's
    advertised gain rating may be at Channel 20, but the gain may be much
    less at Channel
    69. Make sure the dealer guarantees that the antenna purchased is for
    channels in your area.

    Where buildings or other obstructions cause "ghosts," an
    antenna with good directivity is recommended. Directivity is the ability
    to receive only those signals at which an antenna is pointed. Highly directive
    antennas have narrow receiving angles (measured to degrees) and high "front
    to back ratios." To insure the best reception aim the antenna carefully.

    If a good VHF antenna installation is already on hand, it
    will probably be less expensive to add a good quality UHF antenna on the
    same mounting mast, The separate UHF antenna also will permit pointing to
    VHF and UHF antennas independently.

    If all television signals are coming from the same direction,
    both VHF and UHF reception can be improved. Choose an antenna according
    to the distance to the most distant UHF station for which reception is desired
    by installing an all-channel combination antenna. Combining both antennas
    in a single mechanical structure imposes design problems which make the
    selection of a well-engineered antenna very important.

    are several good combination VHF/UHF antennas available. One of the best
    types combine a "log periodic" VHF antenna with
    a "yagi" (pictured at right) UHF antenna on a single horizontal
    boom. If the UHF stations to be received are located in different directions
    from the house (more
    than 30 degrees apart):

    • Either use separate antennas with a mixer or a switch (get professional
      help for this kind of installation.)

    • Or use an antenna rotator with remote control. The rotator is ideal
      when signals come from many directions.


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