Re: TV and sound over CAT5

[Keith Doxey <keith.doxey@xxxxxxx>]

Hi Ashley,

RF is the normal TV signal received via the aerial.
It contains many TV channels and requires a tuner to extract the required
signal. I also requires a huge bandwidth on the cable. With UHF the
frequency range is 470-860 MHz.

Composite Video is the signal that contains the information you want to
see, ie the picture. That is the signal that comes out of the SCART  or AV
phono sockets on your TV and Video recorder.

I am building some boxes to send Composite Video and Audio over CAT5 as
balanced signals. I now have 3 printed circuit board designs finished and
have a few more to do before the finished products will be available but
work is now progressing nicely. (After a VERY long delay).

I will post to the group as soon as they are ready.

Keith

Keith Doxey
http://www.btinternet.com/~krazy.keith
Krazy Keith's World of DIY Home Automation

-----Original Message-----
From:	akitson@xxxxxxx [SMTP:akitson@xxxxxxx]
Sent:	Wednesday, August 04, 1999 1:44 AM
To:	ukha_d@xxxxxxx
Subject:	[ukha_d] Re: TV and sound over CAT5

Keith,

OK so whats Composite Video and Audio.  Is RF TV the stuff we get from
teh arial.  Isn't there some way of applying a simple converter and
turning it into something that can be run.  On the sound front I read
elsewhere that it should be possible to use a balanced signal.  DO you
know of any boxes that can take the output from the amp and sned it
down and then convert it back at the other end.  Sorry to be a
ignoramous about all this stuff, but yoru help is appreciated.

Regards
Ashley.

<000c01bed7b0$8cf78440$82c7928-@krazy> wrote:
original article:http://www.egroups.com/group/ukha_d/?start=677
> Hi Ashley,
>
> You cant run an RF TV signal over CAT5 but you can run Composite
Video and
> Audio over CAT5. Mark McCall has seen my working prototypes and I
have had 5
> sets in use at work distributing a cable TV signal around the
structured
> wiring for 13 months now. I have also designed VGA and CCTV versions.
For
> over a year I have been promising to make the units available but due
to
> lack of time this has not yet happened. It WILL happen in the next
month as
> I have to install 10 CCTV cameras at work by the end of August so I
am now
> presured to get the units finished.
>
> Dont even try to send speakers over CAT5 unless you are talking about
really
> low level background stuff. CAT5 cable is only designed for low
current
> applications of less than 1 amp. Speaker currents can easily peak at
10
> times this value. There will also be considerable loss of signal
through the
> cable in the form of heat.
>
> For running speakers at any decent power level I would recommend the
use of
> 2.5mm cable. Twin & Earth mains cable is probably cheapest but not
very
> flexible or pretty. Figure of 8 Twin Flex (79/0.2) is my preferred
choice as
> this is robust but flexible and not over expensive. I personally do
not buy
> Monster Cable or other similarly branded cable as in my opinion it is
> overpriced hype. All that you  need for speakers is a good quality
heavy
> guage cable to maximise the current transfer between amplifier and
speaker.
>
> Hope that helps
>
> Keith
>
> Keith Doxey
> http://www.btinternet.com/~krazy.keith
> Krazy Keith's World of DIY HomeAutomation
>
>
> > -----Original Message-----
> > From: akitson@xxxxxxx [mailto:akitson@xxxxxxx]
> > Sent: 26 July 1999 11:26
> > To: ukha_d@xxxxxxx
> > Subject: [ukha_d] TV and sound over CAT5
> >
> >
> > Does anyone have suggestions for running UK TV signal over CAT5
wiring?
> >  What are the limitations and what ancillary equipment is needed.
> >
> > Similarly does anyone have information about running speaker
level
> > sound over cat5 wiring?
> >
> > TIA
> > Ashley Kitson
> >
> >


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