Re: KAT5 AV Links

[Keith Doxey <keith.doxey@xxxxxxx>]

Hi Richard,

They send demodulated IR.
Locally powering the units was a design decision. The signals are sent down
the cable as balanced line to avoid problems with interference and ground
loops. If they use power sent from a central point there is a possibility
of a ground loop being introduced thus degrading the performance.

I am interested in your RF over CAT5.
How many channels is it carrying and what is the highest useable channel?
Where I live our TV channels are right at the top end of the UHF band and
we are right on the edge of the reception area. During various times of the
year we suffer so much co-channel interference from the continent and other
UK transmitters that we often cant get a watchable picture at all :-((

Keith

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

-----Original Message-----
From:	Richard Malcolm-Smith [SMTP:rich@xxxxxxx]
Sent:	23 October 1999 06:26
To:	ukha_d@xxxxxxx
Subject:	[ukha_d] Re: KAT5 AV Links

Keith Doxey wrote:

> Some versions of the KAT5 AV links incorporate an IR repeater. They do
not
> include any IR intelligence but merely repeat what they receive.
Therefore
> at the receiver end there is circuitry to receive the AV signals sent
>from
> the other end and an IR receiver to send IR data to the transsmitter.
The
> transmitter sends the AV signals to the distant end and receives the
IR
> data from the receiver. It then converts this back into IR to be fired
at
> the VCR/DVD/Satellite etc.

Does it send the 38000Hz carrier or does it send the demodulated data
stream? If its not demodulating it then you can use the same pair for
power.

I would prefer a box with an IR reciever on the front. and on the back
the RJ45 and composite/Left/Right outputs.

If it looks styley enough it could be placed ontop of the TV or
wherever.

BTW - I have got RF antenna signals going thru cat5 ok here - the lower
UHF is fine, the upper UHF is gettign a bit crappy. VHF channels come
thru with no problems.

--
Richard

--
Richard

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