Cable TV signal

At present I have a combiner in the attic for my TV aerial and Sat LNB
with a diplexer outlet in the room down below.The question is, how can
I send my raw cable TV signal down the same coaxial cable? (as from
time to time I may wish to move my boxes around)

Joseph

Depends what you mean by raw I suppose. If you mean straight out of the
cable, then you cannot. I think its against the terms and conditions to
attempt to terminate the cable in anything but the box supplied.

The signals are at fairly low frequencies and have probably more in common
with broadband modem signals than tv ones.

Brian

--
Brian Gaff....Note, this account does not accept Bcc: email.
graphics are great, but the blind can't hear them
Email:
__________________________________________________ __________________________________________________ __________


"Joseph" [email protected] wrote in message
...
At present I have a combiner in the attic for my TV aerial and Sat LNB
with a diplexer outlet in the room down below.The question is, how can
I send my raw cable TV signal down the same coaxial cable? (as from
time to time I may wish to move my boxes around)

Joseph

Brian Gaff wrote:
Depends what you mean by raw I suppose. If you mean straight out of the
cable, then you cannot. I think its against the terms and conditions to
attempt to terminate the cable in anything but the box supplied.

Correct!

The signals are at fairly low frequencies and have probably more in common
with broadband modem signals than tv ones.

Brian


No, youre wrong there! I've no direct knowledge of the former Telewest
operations of Virgin Media but I've no doubt they are very similar to
former Ntl practice which uses 120 - 750MHz for TV signals.

As most networks were upgraded to 750MHz (from 600MHz or, in some older
networks, 500Mz) to provide DTV capacity, the analogue signals are
primarily at the bottom end and the DTV signals at the top with some
intermingling in the middle. IIRC some networks also have DTV at 120MHz
if the capacity is needed and the channel was not in use for analogue.

A couple of points to note - most analogue signals are scrambled so are
of no use even if you have a TV with a multi-band tuner (i.e.:
continuous coverage from 47 - 862MHz) and there might not even be any
analogue signals present! They were turned off at Ashford, which also
feeds Dover and Folkestone, about 3 years or so ago! This may well have
happened elsewhere in the country by now.

DTV signals can only be received using the correct STB as the encoding
is incompatible with DTT or satellite signals.

It is important to remember that CATV feeds are bi-directional as the
5-65MHz portion of the bandwidth is used for return path signals to the
headend, both for STB comunication and, more importantly, broadband
internet use.

You wont be very popular if your illegal tampering allows ingress into
the return path!

Terry