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I don't think you would need to hook the SNES to your cable box but only to the TV using the Red, Yellow, White cables that plug into the gaming system. If you do not have those cables you can most likely find them for cheap on www.ebay.com
Call your cable company as there might be a problem with the drop line or aerial coming into your house. now another thing is if you have a signal splitter( ex: 2-way, 3-way, 4-way) before the cable box, that could be degrading the signal as each input may drop the signal significantly. remeber, don't use too many splitters as they will make the signal faded/fuzzy. also, make sure all the connectors are clean and are not badly bent or the ends frayed. If you can see wire insulation from the cable line then it's no good.
Is your outdoor aerial a proper freeview aerial and are you in a strong or weak signal area.You can check here:http://www.stevelarkins.freeuk.com/freeview_digital_tv.htm Also check your connections as the coax may be shorting with the braid or a bad connection.once checked try ordinary channels on upstairs tv and if ok retune all your digital channels. This can be due to a few problems.Firstly make sure your aerial is
pointing in the right direction as beam aerials attenuate(disregard)
signals which are not pointing directly at the aerial. make sure you are using good quality 75ohm cable i.e rg6 and connections are good and not shorting out. The length of run of the cable will also affect the signal as will any splitters or joins in the cable. If
you know the signal is good in your area then it will be down to the
aerial,cable terminations ,aerial position or a combination of these. If
the signal is poor you can either...Buy a high db gain arial which will
amplify the signal and or a masthead preamp which will again boost the
signal. please note that if your aerial is not pointing in the
correct direction then any boosting of a bad signal i.e ghosting...will
only make it worse. try starting from aerial direction then connections then a high gain aerial and or booster.
Make sure everything's connected in the correct sockets. Turn the SNES on, change to one of the Analogue channels (one of the channels which you control with the TV remote) and start scanning for a signal. The RF cable has to be connected to the analogue port (where a TV aerial would plug in to get analogue channels) and the SNES needs to be switched on.
The alternative is to get a SCART-compatible cable that works with a Gamecube or an N64 and use it with the SNES, as Nintendo had the foresight to add an EXT port which'll let you play the SNES on an AV channel.
I am sumising that you have checked the menu controls on your tv and are recieving your signal from the cable box , so therefore if it is not comong from the Aerial and direct from the cable company then the picture should be clear .. However sometimes people dont check to see if the signal is RGB or composite from the box RGB is usually best if you have a scart socket connection or SVHS if your set has that capability .. sometimes people have an old VHs recorder and the sinal is coming from that to the set through the Aerail fly lead if it is you will probably find they are conflicting giving you a poor picture retune your Video to another channel instructions should be in its manuel if not come back to me ... reagrds Vortash
its an rf cable you can buy third party ones if you search on the internet. also if you happen to have a video cable for gamecube or n64 you can plug that into the slot on the back of the snes and it will work. Im not sure what that slot is called but its the only one that cable will fit into.
If you put aerial up your self was it wide band aerial ?
Is it in the atic or on the roof ?
Have you used decent quality cable (not the cheap stuff)
How long is cable run from aerial ?
Have you checked that when you fitted rf plugs that none of the braid strands are touching solid copper inner core ?
Ask an earial installer or Tv shop what the signal strength is like in your area. http://dysonmanuals.llc.nu/