CHANNEL 5 RE-TUNING
FOR WHAT YOUíRE ABOUT TO RECEIVE...
If youíve been contacted or visited by a Channel 5
Broadcasting (C5B) Ďre-tunerí recently itís a fairly safe bet you live in one
of the 70% of UK households who will be able to receive the new channel when it
starts broadcasting on January 1st next year. However, quite a lot of other
people, especially those living in fringe reception areas, will be getting the
signal too. It may not be strong enough for a watchable picture, but it could
cause interference to video recorders and satellite receivers, connected to the
TV by the aerial lead.
Channel 5 problems come in two basic forms: thereís
co-channel interference from C5B broadcasts on channels adjacent to the RF output
frequency used by VCRs and satellite tuners; and image channel interference,
where C5B transmissions clash with VCR
or satellite receiver output signals, nine channels above or below. In either
case something has to move, and itís not going to be Channel 5...
If youíre suffering from interference problems -- test
broadcasts have already begun in some areas -- you should get in touch with
Channel 5 Broadcasting, who are legally obliged to sort it out. However, itís
not difficult to make the necessary adjustments yourself, though if you do
decide to have a go, make sure you have your TV, VCR and satellite receiverís
instruction manuals to hand, in case you get into a tangle.
Changing the RF output frequency on a VCR or satellite tuner
is simple. With only a few exceptions the adjustment screw is located close to the aerial input and
output sockets on the device concerned; theyíre usually marked Ďch 32-43í, ĎRF
outí, or a curved two headed arrow. The easiest method is to play a tape or
select a satellite channel, make sure itís showing on the TV, then turn the
adjusting screw a few degrees clockwise, until the picture disappears. Next
re-tune the TV to the new setting and make sure youíve got a clean
picture. If youíve got a satellite
receiver connected to the aerial lead as well check the picture is okay, and
leave well alone if thereís no interference problems. If there is then carry
out the same procedure, not forgetting to re-tune the VCR to the satellite
channel as well.
If your VCR or satellite tuner hasnít got a RF output
adjusting screw then itís probably one of a handful of models where this is
controlled by the productís operating software. The procedure will be explained
in the instruction manual.
Aerial lead connections are far from ideal, especially if
youíve got a stereo TV, so this may be a good time to think about upgrading
your system by using SCART AV leads to connect the VCR and satellite box to the
TV, then youíll have no problems from Channel 5, plus better picture and sound.
R. Maybury 1996 1907