Richard
Have a
play with Taboo
http://www.automatedhome.co.uk/downloads.html
it
works
out X-interference
just
click
first on your known outside channels and you will see which channels you
have
left for your modulators and vhs etc
A must
if
you are setting your own modulator channels worth doing even for a single
VHS
machine
Mike Griffiths
-----Original
Message-----
From: Richard Malcolm-Smith
[mailto:rich@xxxxxxx]
Sent: Sat 31 Mar 01 11:53
To: ukha_d@xxxxxxx
Subject: [ukha_d]
Modulators
How are people hooking these up? I tried using a splitter
backward
with
my antenna and the output of my sky reciever, and authough the
antenna
signal was fine, the sky channel was terrible.
I was feeding from the backwards splitter into an 8 way splitter to
6
TV's
If I run the antenna into the sky box, and then out, not only is the
sky
picture crap, but so is my off-air channels. With it connected that
way,
on 2 of my TV's with the longest cable runs (Garage/workshop,
and
kitchen) the off antenna pictures get quite blurrey, almost asif
there
was a ghost there (This is only on high UHF channels). If I run
the
output of the sky box directly to the 8 way splitter its almost
perfict
on all tvs. Some channels have some swirly lines over them, but
nothing
majorly annoying. If I run it thru the backwards splitter to the 8
way
splitter its a bit worse then direct, but nothing major. Its
only
connecting up the antenna that does it. From what I have being told
the
output of the skybox is quite weak - I was told its only 70
dBµV,
whereas off air can be up to 100dBµV or more. I may be able to fix
that
with an antenna amplifier on the output of the sky box.
Now here in New Zealand things are a bit different to the UK, in that
we
use all the UHF band, and VHF for tv. I suspect that there isnt
enough
free channel space for the RF out of the sky, or that there is
simply
too much noise there for it to compete with.
The problem here is that I am wanting to get some modulators to get
CCTV
cameras on all the TV's, I suspect that I may need filters of some
sort,
I dont want to end up building a complete MATV system for the sake of
a
few cameras tho.
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