Correct way to insert RF into IRS sytem.

Well folks, I am 3/4 way done with a IRS system comprising 5x 12 multiswitch
and associated wiring to quad plex outlets.

The living room is the only room with a wired RF return (perhaps from a sky
box etc) to the 'head end'.

I would like to insert this feed into the system to be available on the
other wall plates along with the terrestrial RF pre-multiswitch. It would
need to have IR magic eye pass through.

Do i need some form of loft box, combiner or a dual input amp??

TIA Tim..

Tim wrote:
Well folks, I am 3/4 way done with a IRS system comprising 5x 12
multiswitch and associated wiring to quad plex outlets.

The living room is the only room with a wired RF return (perhaps from a
sky box etc) to the 'head end'.
Well, will it be a Skybox or not?


I would like to insert this feed into the system to be available on the
other wall plates along with the terrestrial RF pre-multiswitch.
What do you mean 'pre-multiswitch'? Normally all the wallplates would be
fed from the switch, so 'pre-multiswitch'?

It
would need to have IR magic eye pass through.

Do i need some form of loft box, combiner or a dual input amp??

Take a look at
http://www.wrightsaerials.tv/article...-clear-sky.pdf
and tell me if it helps (or not). Some of the the other articles cover
the subject in more detail.

Bill

"Bill Wright" wrote in message
...
Tim wrote:
Well folks, I am 3/4 way done with a IRS system comprising 5x 12
multiswitch and associated wiring to quad plex outlets.

The living room is the only room with a wired RF return (perhaps from a
sky box etc) to the 'head end'.
Well, will it be a Skybox or not?


I would like to insert this feed into the system to be available on the
other wall plates along with the terrestrial RF pre-multiswitch.
What do you mean 'pre-multiswitch'? Normally all the wallplates would be
fed from the switch, so 'pre-multiswitch'?

It
would need to have IR magic eye pass through.

Do i need some form of loft box, combiner or a dual input amp??

Take a look at
http://www.wrightsaerials.tv/article...-clear-sky.pdf
and tell me if it helps (or not). Some of the the other articles cover the
subject in more detail.

Bill


I'll assume that the RF feed from the living room back via the Return cable
will be from a sky box.

From the link I can see that it was along the lines I was thinking, although
I'll substitue the loft box for the multiswitch and all should be merry!

Who can supply the Taylor filters??

Thanks Bill

Tim.. wrote:

Who can supply the Taylor filters??

Taylor !

http://www.taylorbros.co.uk/

They're a bit funny lot to deal with at times, it can be a white-knuckle ride !


--
Mark
Please replace invalid and invalid with gmx and net to reply.

www.paras.org.uk

Mark Carver wrote:
Tim.. wrote:

Who can supply the Taylor filters??

Taylor !

http://www.taylorbros.co.uk/

They're a bit funny lot to deal with at times, it can be a white-knuckle
ride !

When you order the filters fill in the filter order form. It's in the
catalogue. It's a badly designed form so I usually also enclose a clear
written description thus:

TCFL 6 with three inputs:
Input 1: channels 22, 28, and cluster for channels 32/33
Input 2: channels 26, 40
Input 3: cluster for channels 66/67/68

All filters have one output, by the way.

Bill

In article , Bill Wright
writes
Tim wrote:
Well folks, I am 3/4 way done with a IRS system comprising 5x 12
multiswitch and associated wiring to quad plex outlets.

The living room is the only room with a wired RF return (perhaps from a
sky box etc) to the 'head end'.
Well, will it be a Skybox or not?


I would like to insert this feed into the system to be available on the
other wall plates along with the terrestrial RF pre-multiswitch.
What do you mean 'pre-multiswitch'? Normally all the wallplates would be
fed from the switch, so 'pre-multiswitch'?

It
would need to have IR magic eye pass through.

Do i need some form of loft box, combiner or a dual input amp??

Take a look at
http://www.wrightsaerials.tv/article...-clear-sky.pdf
and tell me if it helps (or not). Some of the the other articles cover
the subject in more detail.

Bill

Anything fundamentally wrong with skipping the filters on a simple
domestic system?

That is if the Sky box is just outputting a single channel and it is
chosen not to clash with any channel likely to be received from the
aerial.
--
fred
FIVE TV's superbright logo - not the DOG's, it's ********

fred wrote:

Take a look at
http://www.wrightsaerials.tv/article...-clear-sky.pdf
and tell me if it helps (or not). Some of the the other articles cover
the subject in more detail.

Bill

Anything fundamentally wrong with skipping the filters on a simple
domestic system?

That is if the Sky box is just outputting a single channel and it is
chosen not to clash with any channel likely to be received from the aerial.

No. My attitude is that the job is easier and more reliable with
filters, so I tend to use them, but of course the loop-thro method is
almost universally employed and can be made to work well. You do need to
match the aerial signal strength to the modulator signal strength. If
there's a problem finding a clear channel you can always use a stop filter.

Bill

In article , Bill Wright
writes
fred wrote:

Take a look at
http://www.wrightsaerials.tv/article...-clear-sky.pdf
and tell me if it helps (or not). Some of the the other articles cover
the subject in more detail.

Bill

Anything fundamentally wrong with skipping the filters on a simple
domestic system?

That is if the Sky box is just outputting a single channel and it is
chosen not to clash with any channel likely to be received from the aerial.

No. My attitude is that the job is easier and more reliable with
filters, so I tend to use them, but of course the loop-thro method is
almost universally employed and can be made to work well. You do need to
match the aerial signal strength to the modulator signal strength. If
there's a problem finding a clear channel you can always use a stop filter.

My thoughts were that you have to work to different rules as it has to
be a first time fix and a lasting solution with no return visits

For a diy home install with plenty of unused channels the o/p could
maybe try it w/o the filters and see if it works ok. If not then the
necessary filters could be ordered & installed. The benefit being cost
of course and versatility for future system/channel changes. Thought the
amps would be cheap enough and could stay to set levels.

Just a few thoughts.
--
fred
FIVE TV's superbright logo - not the DOG's, it's ********

fred wrote:
In article , Bill Wright
writes
fred wrote:

My thoughts were that you have to work to different rules as it has to
be a first time fix and a lasting solution with no return visits

Well yes, and to be honest the jobs we usually do aren't
price-conscious, so there's no problem using filters. Having said that,
I'm quite happy to do a domestic install and daisy-chain through the Sky
box if required.


For a diy home install with plenty of unused channels the o/p could
maybe try it w/o the filters and see if it works ok. If not then the
necessary filters could be ordered & installed. The benefit being cost
of course and versatility for future system/channel changes. Thought the
amps would be cheap enough and could stay to set levels.

Just a few thoughts.

Yes, I agree.

A useful little device for the domestic market is the part-UHF bandpass
filter. These are cheap enough. See

http://dl.dropbox.com/u/11023364/List%20for%20Bob.doc

One of these will help a lot to provide a clear channel.

An important factor here is the amount of gain on the aerial feed. If
local field strength is low there is likely to be a masthead amplifier,
and of course that will amplify everything, not just the wanted signals.
Under these circumstances it is quite common to see impulse interference
from traffic appear on the Sky picture, and any faint signal that fades
in due to a 'lift' can have a pronounced effect. I always assume that
there is no such thing as a clear channel!

Bill

In article , Bill Wright
writes
fred wrote:
In article , Bill Wright
writes
fred wrote:

My thoughts were that you have to work to different rules as it has to
be a first time fix and a lasting solution with no return visits

Well yes, and to be honest the jobs we usually do aren't
price-conscious, so there's no problem using filters. Having said that,
I'm quite happy to do a domestic install and daisy-chain through the Sky
box if required.


For a diy home install with plenty of unused channels the o/p could
maybe try it w/o the filters and see if it works ok. If not then the
necessary filters could be ordered & installed. The benefit being cost
of course and versatility for future system/channel changes. Thought the
amps would be cheap enough and could stay to set levels.

Just a few thoughts.

Yes, I agree.

A useful little device for the domestic market is the part-UHF bandpass
filter. These are cheap enough. See

http://dl.dropbox.com/u/11023364/List%20for%20Bob.doc

One of these will help a lot to provide a clear channel.

An important factor here is the amount of gain on the aerial feed. If
local field strength is low there is likely to be a masthead amplifier,
and of course that will amplify everything, not just the wanted signals.
Under these circumstances it is quite common to see impulse interference
from traffic appear on the Sky picture, and any faint signal that fades
in due to a 'lift' can have a pronounced effect. I always assume that
there is no such thing as a clear channel!

Thanks for the info and potential gotchas, I'm expecting to be doing
this later on in the year.
--
fred
FIVE TV's superbright logo - not the DOG's, it's ********