VHF/UHF TV 'bus' - can you go both ways on the same cable?

[Rowan Crowe]

I'm trying to figure out the most flexible and cost effective way to
feed A/V around our new home.

I want a TV antenna and 3 outlets... standard stuff. But I also want
to be able to 'backfeed' from any of those outlets, eg feed foxtel
through a modulator in the family room so it can be watched from the
outlet in the lounge or the study.

Can this be done without needing to double up on wiring and outlets?

 

[atec]

foxtel has rf sockets . so set the other tv to the channel of choice the
box is on , Brisbane is 63 rf , each city is diff of course , the rest
may take some extra cables

Rowan Crowe wrote:

I'm trying to figure out the most flexible and cost effective way to
feed A/V around our new home.

I want a TV antenna and 3 outlets... standard stuff. But I also want
to be able to 'backfeed' from any of those outlets, eg feed foxtel
through a modulator in the family room so it can be watched from the
outlet in the lounge or the study.

Can this be done without needing to double up on wiring and outlets?

--
X-No-Archive: Yes

 

[Rowan Crowe]

I don't think I've explained this correctly... I want to be able to
backfeed at an arbitrary point and also still be able to receive
off-air signals.

eg: if family room is feeding in foxtel via mod and lounge is watching
that, study must be able to receive normal off-air as well.

So there are two issues I can see:

1. The method by which the outlets are coupled to the TV antenna
(don't splitters have high isolation between the outputs?)
2. The modulator swamping the level of off-air signal.

The prewiring is being done today but I think that's basically placing
3 wires between the wall and roof, so I have a little more time to
figure out how to properly connect them together.


atec <"atec77(notspam)"@hotmail.com> wrote in message news:<411B224B.305814B2@hotmail.com>...

foxtel has rf sockets . so set the other tv to the channel of choice the
box is on , Brisbane is 63 rf , each city is diff of course , the rest
may take some extra cables

Rowan Crowe wrote:

I'm trying to figure out the most flexible and cost effective way to
feed A/V around our new home.

I want a TV antenna and 3 outlets... standard stuff. But I also want
to be able to 'backfeed' from any of those outlets, eg feed foxtel
through a modulator in the family room so it can be watched from the
outlet in the lounge or the study.

Can this be done without needing to double up on wiring and outlets?

 

On 12 Aug 2004 13:36:45 -0700, googlegroups@sensation.net.au (Rowan
Crowe) wrote:

I don't think I've explained this correctly... I want to be able to
backfeed at an arbitrary point and also still be able to receive
off-air signals.

eg: if family room is feeding in foxtel via mod and lounge is watching
that, study must be able to receive normal off-air as well.

So there are two issues I can see:

1. The method by which the outlets are coupled to the TV antenna
(don't splitters have high isolation between the outputs?)
2. The modulator swamping the level of off-air signal.

The prewiring is being done today but I think that's basically placing
3 wires between the wall and roof, so I have a little more time to
figure out how to properly connect them together.

I understand what you're talking about, feeding the Foxtel RFsignal
back to the splitter and then out to the other TVs?

I have no idea if it would work however:

I'd run a cable from the output of the foxtel box and add it into the
incoming RF signal from the antenna before it gets to the splitter.

Adding the foxtel signal and fta signal is just a matter of using a 2
way splitter in reverse. You can buy attenuators for the foxtel box if
the signal is too much.

 

[Rowan Crowe]

David Sauer wrote in message news:<9r7oh0d1877j9mb58on6fmshp3gt9rd58k@4ax.com>...

On 12 Aug 2004 13:36:45 -0700, googlegroups@sensation.net.au (Rowan
Crowe) wrote:

I don't think I've explained this correctly... I want to be able to
backfeed at an arbitrary point and also still be able to receive
off-air signals.

eg: if family room is feeding in foxtel via mod and lounge is watching
that, study must be able to receive normal off-air as well.

So there are two issues I can see:

1. The method by which the outlets are coupled to the TV antenna
(don't splitters have high isolation between the outputs?)
2. The modulator swamping the level of off-air signal.

The prewiring is being done today but I think that's basically placing
3 wires between the wall and roof, so I have a little more time to
figure out how to properly connect them together.

I understand what you're talking about, feeding the Foxtel RFsignal
back to the splitter and then out to the other TVs?

Yes, but as one example only. The feed could come from any of the
rooms that have an antenna outlet.

I had a quick hunt through google and it seems that most splitters
have 25dB+ isolation between output ports. I don't know whether a
local modulator would have enough signal to hop over this (perhaps
with a slight power modification), but then there's the risk of
radiating the signal out through the antenna!

It would be possible to use relays in the roof to remotely switch the
splitter inputs and outputs around, but that does complicate things.
(Hmmm, I guess I could use DC signalling through the same coax...)

 

On 13 Aug 2004 00:56:47 -0700, googlegroups@sensation.net.au (Rowan
Crowe) wrote:

I had a quick hunt through google and it seems that most splitters
have 25dB+ isolation between output ports. I don't know whether a
local modulator would have enough signal to hop over this (perhaps

http://capitolsales.com/tech-RF-modulation.html

First one Google spat out.

Note the 'Backwards 3 way splitter'