Optical LNB
 

Anyone seen anything like this in the wild?
http://www.triax.co.uk/Products/Fibr...cal%20LNB.aspx

--
Graham.

%Profound_observation%

Optical LNB
 

What would be the point exactly? I mean it still needs power from somewhere
presumably.
Brian

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


"Graham." wrote in message
...
Anyone seen anything like this in the wild?
http://www.triax.co.uk/Products/Fibr...cal%20LNB.aspx

--
Graham.

%Profound_observation%

Optical LNB
 

On Mon, 25 May 2009 16:20:30 GMT, "Brian Gaff"
wrote:

What would be the point exactly? I mean it still needs power from somewhere
presumably.
Brian

It says it takes its power from a coax via an f type connector

I would be interested in this. only one co-ax and one fibre to run
with up to 32 o/p's

--
Cheers

Peter

Optical LNB
 

Petert wrote:
On Mon, 25 May 2009 16:20:30 GMT, "Brian Gaff"
wrote:

What would be the point exactly? I mean it still needs power from somewhere
presumably.
Brian

It says it takes its power from a coax via an f type connector

I would be interested in this. only one co-ax and one fibre to run
with up to 32 o/p's


Have a job on at the moment for a domestic house.

2no dishes on a tower, 90m away from the house. The house is being wired
for 2 satellites to every point originally a 9 wire system. 17 points.

Instead of 8 WF165 cables from the tower, Power, Cabinet for launch amp
etc. I'm installing a single WF100 for the power (2 way splitter at
dishes) and 2 fiber to replace the 8 WF165 cables. All at about quarter
of the price.

Optical LNB
 

In message , Glenn
Millar writes
Petert wrote:
On Mon, 25 May 2009 16:20:30 GMT, "Brian Gaff"
wrote:

What would be the point exactly? I mean it still needs power from
somewhere presumably.
Brian
It says it takes its power from a coax via an f type connector
I would be interested in this. only one co-ax and one fibre to run
with up to 32 o/p's


Have a job on at the moment for a domestic house.

2no dishes on a tower, 90m away from the house. The house is being
wired for 2 satellites to every point originally a 9 wire system. 17
points.

Instead of 8 WF165 cables from the tower, Power, Cabinet for launch amp
etc. I'm installing a single WF100 for the power (2 way splitter at
dishes) and 2 fiber to replace the 8 WF165 cables. All at about quarter
of the price.

Presumably the whole of the IF band (900 to 2300MHz?) is modulated onto
the laser. In this respect, it's fairly similar to Cable TV laser links
(although the frequency range is presently (say) 50 to 1000MHz max).

The number of TV signals present will be less than for CATV systems,
allowing a higher mod depth per signal. For digital signals, the optical
receiver/converters are going get away with an input level at a minimum
input of around -10 to -13dBm (maybe even a bit less). Allowing for
losses, optical splitting 32-ways will give a pessimistic loss of maybe
20dB, so the optical transmitter will need an output of 7dBm (as
specced).

At 1310nm, CATV fibre loss is about 0.35db (Triax's 0.3dB is maybe a bit
optimistic), so it's obvious that you could have a fair distance between
the dish and the subscribers. The only problem is that, so far, no one
has realistically found a way of line powering over the fibre.
--
Ian

Optical LNB
 

On Mon, 25 May 2009 20:08:29 +0100, Glenn Millar
wrote:

Petert wrote:
On Mon, 25 May 2009 16:20:30 GMT, "Brian Gaff"
wrote:

What would be the point exactly? I mean it still needs power from somewhere
presumably.
Brian

It says it takes its power from a coax via an f type connector

I would be interested in this. only one co-ax and one fibre to run
with up to 32 o/p's


Have a job on at the moment for a domestic house.

2no dishes on a tower, 90m away from the house. The house is being wired
for 2 satellites to every point originally a 9 wire system. 17 points.

Instead of 8 WF165 cables from the tower, Power, Cabinet for launch amp
etc. I'm installing a single WF100 for the power (2 way splitter at
dishes) and 2 fiber to replace the 8 WF165 cables. All at about quarter
of the price.

So what does the fibre terminate on at the cistomer end? Some sort of
optical-electrical distribution amp?
--
Cheers

Peter

Optical LNB
 

Glenn Millar wrote:

2no dishes on a tower, 90m away from the house. The house is being wired
for 2 satellites to every point originally a 9 wire system. 17 points.


If I get you to install a system like that will you give me the house to
match?

Andy

Optical LNB
 

On Mon, 25 May 2009 21:08:43 +0100, Ian Jackson
wrote:

In message , Glenn
Millar writes
Petert wrote:
On Mon, 25 May 2009 16:20:30 GMT, "Brian Gaff"
wrote:

What would be the point exactly? I mean it still needs power from
somewhere presumably.
Brian
It says it takes its power from a coax via an f type connector
I would be interested in this. only one co-ax and one fibre to run
with up to 32 o/p's


Have a job on at the moment for a domestic house.

2no dishes on a tower, 90m away from the house. The house is being
wired for 2 satellites to every point originally a 9 wire system. 17
points.

Instead of 8 WF165 cables from the tower, Power, Cabinet for launch amp
etc. I'm installing a single WF100 for the power (2 way splitter at
dishes) and 2 fiber to replace the 8 WF165 cables. All at about quarter
of the price.

Presumably the whole of the IF band (900 to 2300MHz?) is modulated onto
the laser. In this respect, it's fairly similar to Cable TV laser links
(although the frequency range is presently (say) 50 to 1000MHz max).

The number of TV signals present will be less than for CATV systems,
allowing a higher mod depth per signal. For digital signals, the optical
receiver/converters are going get away with an input level at a minimum
input of around -10 to -13dBm (maybe even a bit less). Allowing for
losses, optical splitting 32-ways will give a pessimistic loss of maybe
20dB, so the optical transmitter will need an output of 7dBm (as
specced).

At 1310nm, CATV fibre loss is about 0.35db (Triax's 0.3dB is maybe a bit
optimistic), so it's obvious that you could have a fair distance between
the dish and the subscribers. The only problem is that, so far, no one
has realistically found a way of line powering over the fibre.

I work on the basis of 0.2dB loss per kilomtre when doing a cable
repair - at 1550nm
--
Cheers

Peter

Optical LNB
 

In message , Petert
writes

I work on the basis of 0.2dB loss per kilomtre when doing a cable
repair - at 1550nm

That's optimistic too! 0.26 (not counting less-than-perfect splices)?
--
Ian

Optical LNB
 

On Mon, 25 May 2009 21:23:32 +0100, Ian Jackson
wrote:

In message , Petert
writes

I work on the basis of 0.2dB loss per kilomtre when doing a cable
repair - at 1550nm

That's optimistic too! 0.26 (not counting less-than-perfect splices)?

I try and reject any splice 0.2dB. I tend to see splices in the
0.02dB range, depending on the fibre type and if like for like fibre
is being spliced together
--
Cheers

Peter