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Thread: Fuzzy TV (freeview)

  1. #1
    Sending it Gibo's Avatar
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    Fuzzy TV (freeview)

    Anyone know why my tv tiles up especially when the lawnmower is going or the neighbors v8 rx7 goes past. Its on a uhf aerial.

  2. #2
    OPCz Rushy's Avatar
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    tInterference? In fact Gibo I would say some sort of radio / electrical interference. Earth your nana's teapot.
    Gibo likes this.
    It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.
    What more do we need? If we are above ground and breathing the rest is up to us!
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    uhf aerials come in 2 types . phased array which looks like a dish rack or yagi, which is long and pointy. arrays are better for scattered signal and yagi's are best for long distance.
    also cable should be RG6 or better
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  4. #4
    Member GravelBen's Avatar
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    If its only when loud noises are happening it could just be a loose connection that is vibrating with certain sound frequencies?
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  5. #5
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    I'd say a shielding or earthing/shorting issue - and most probably at the aerial end.
    Check connections (water, shielding , tight, lichen growth, etc ) and insulators on aerial are clean & not cracked.
    gadgetman and Gibo like this.
    Please excuse spelling, as finger speed is sometimes behind brain spped........ Or maybe the other wayy.....

  6. #6
    GSP Mad Munsey's Avatar
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    Road spikes should fix it
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    Rule 7: Avoid alcohol and drugs when handling firearms

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    @Gibo In the "old day's" you would put a resistive suppressor in line in the lawn mower's spark plug lead and tell your neighbor to pull the gorse out and put a new set of silicon/carbon leads on the rice burner!
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  8. #8
    Member gadgetman's Avatar
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    Buy a goat.
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  9. #9
    Sending it Gibo's Avatar
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    Il get on the roof for a nosey..... tomorrow
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  10. #10
    Member gadgetman's Avatar
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    Quote Originally Posted by Gibo View Post
    Il get on the roof for a nosey..... tomorrow
    If you're close to the coast a bucket of warm soapy water to wash the salt off works wonders too.
    There are only three types of people in this world. Those that can count, and those that can't!

  11. #11
    OPCz Rushy's Avatar
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    Quote Originally Posted by Gibo View Post
    Il get on the roof for a nosey..... tomorrow
    Make sure you have edge protection and a fall arrest harness clipped to a strong point Gibo as the ground is twice as far from the roof for the vertically challenged. Four times as far if you had Dundee do it.
    It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.
    What more do we need? If we are above ground and breathing the rest is up to us!
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  12. #12
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    Quote Originally Posted by Rushy View Post
    Make sure you have edge protection and a fall arrest harness clipped to a strong point Gibo as the ground is twice as far from the roof for the vertically challenged. Four times as far if you had Dundee do it.
    You took the words out of my mouth, however these young guys are right into H&S Rushy, hat hat, safety boots, hi vis, safety boots and sun screen! Gibo get your wife to do it and play catcher, on the ground. Might have some RG6 if needed.
    Boom, cough,cough,cough

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    is it one signal length of cable or are there splitters and amplifiers en route ?
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  14. #14
    Sending it Gibo's Avatar
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    Quote Originally Posted by gonetropo View Post
    is it one signal length of cable or are there splitters and amplifiers en route ?
    One splitter.

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    TV cable is coaxial. the screen on the outside is purely to stop unwanted signal entering into the inner conductor but it also provides a reference point for the signal. if the screen connector is not connected at both ends you can get all sorts of issues. Currently the standard for domestic cable is RG6, this is a solid cored cable and despite being an industry standard there are hug variances between manufacturers especially when it comes to the outside screening. The best is twin screen which uses both a foil and a braid.
    The best way to terminate RG6 is with F-connectors. some of these crimp on, some push on and some screw on. The latter ones will give you issues, crimping is the only correct and reliable way.
    Splitters should also be F connector types with a sealed metal housing, the old screw and clamp types will give you no end of trouble as well as being highly efficient.
    If you are going for long distance between the aerial and the transmitter then use a yagi aerial, the more elements there are the more gain you will have but the more directional it will be so unless you can see the transmitter or have a method of measuring aerial signal it may need trial and error to get it pointed right.
    If you are closer to the transmitter but have a row of trees etc in the way then phased array antennas are the way to go, they have less gain but a wide field of view. But by having less gain means that you will not be able to split the signal up as efficiently.
    Also most aerials for sale have 2 mounting positions, they can be set up to be horizontally or vertically polarized, get it wrong and the amount of gain will be a fraction of what it should be, but i have been to many installs where the sparky has set up the antenna wrongly poled.
    No amplifiers etc are going to help you get a better signal, amps do just that they amplify. you put crap in you get more crap out. If you have a long distance from your aerial to your tv then you can use a masthead amplifier to make up for the losses that will occur in the cable but it will not improve the signal quality.
    Once you obtain decent signal then you can amp and split multiple times. My record was over 400 outlets in a hotel from one discrete antenna. But if you cant get a good signal in the first place you are wasting your time.
    Do not!! mount your aerial on a chimney unless you have to, smoke and soot ruins aluminium and promotes corrosion between the ally and the steel nuts and bolts holding it all together.
    Also not all tv's have the same tuner. I can run my panasonic off an outlet that makes my sony pixalate like mad. If you are having reception issues try another tv on the same outlet.
    madjon_, gadgetman and berg243 like this.

 

 

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