Optical LNB

Petert wrote:
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?

Terminates in Twin, Quad and Quattro units. The quattro used mainly in
systems or supplying multi switches.

http://www.globalinvacom.com/product...ubmenuheader=3

This is the stuff I'm using.

On Mon, 25 May 2009 21:41:27 +0100, Glenn Millar
wrote:

Petert wrote:
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?

Terminates in Twin, Quad and Quattro units. The quattro used mainly in
systems or supplying multi switches.

http://www.globalinvacom.com/product...ubmenuheader=3

This is the stuff I'm using.

Thanks. A look through the Triax website shows they produce a similiar
set of products
--
Cheers

Peter

"Glenn Millar" wrote in message
o.uk...
Petert wrote:
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?

Terminates in Twin, Quad and Quattro units. The quattro used mainly in
systems or supplying multi switches.

http://www.globalinvacom.com/product...ubmenuheader=3

This is the stuff I'm using.

Nice work there Glenn. Any chance you can take some pictures of the
installation once complete? I'd be very interested to see them.

-GB-Carpy wrote:

"Glenn Millar" wrote in message
o.uk...
Petert wrote:
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?

Terminates in Twin, Quad and Quattro units. The quattro used mainly in
systems or supplying multi switches.

http://www.globalinvacom.com/product...ubmenuheader=3

This is the stuff I'm using.

Nice work there Glenn. Any chance you can take some pictures of the
installation once complete? I'd be very interested to see them.

Second fix and tower won't be until end of September. It's a new build
and a big house, about 11,000sq feet. I'll be featuring it on my website
anyway. I'll post here when it's done and give a full rundown of the fiber.

Glenn.

Glenn Millar - TV Aerials
www.glennmillar.plus.com

"Glenn Millar" wrote in message
o.uk...
-GB-Carpy wrote:

"Glenn Millar" wrote in message
o.uk...
Petert wrote:
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?

Terminates in Twin, Quad and Quattro units. The quattro used mainly in
systems or supplying multi switches.

http://www.globalinvacom.com/product...ubmenuheader=3

This is the stuff I'm using.

Nice work there Glenn. Any chance you can take some pictures of the
installation once complete? I'd be very interested to see them.

Second fix and tower won't be until end of September. It's a new build and
a big house, about 11,000sq feet. I'll be featuring it on my website
anyway. I'll post here when it's done and give a full rundown of the
fiber.

Glenn.

Glenn Millar - TV Aerials
www.glennmillar.plus.com

Excellent thanks Glenn. I've not dabbled with this new fibre yet so it's
really interesting stuff.

"Petert" wrote in message
...
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

No it's not that good, but it would replace a quad or quattro LNB in a
multi-sat installation - so one coax (although one assumes this could be
powered locally) and one fibre carrying both bands (but probably as a
continuous band) in both polarities instead of four coax.

The other big advantage is the much lower losses through fibre as compared
with CT100 (or better) is the far lower losses. This means that the dish
can be quite a long way from the receiver (like on top of a hill) in places
where there is no clear view of the Clarke belt.

In addition it is a relatively simple matter to split and amplify the
optical signal.

I expect this may get developed, since the power for the LNB is fairly low,
so visible light could be transmitted the other way to provide sufficient
energy to run the LNB. They will also connect direct to receivers.

I will certainly be looking seriously at them to fit on a Wavefrontier SMATV
for two blocks of flats - a doddle compared to long lossy multiple runs
between the blocks.

In message , R. Mark Clayton
writes

"Petert" wrote in message
.. .
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

No it's not that good, but it would replace a quad or quattro LNB in a
multi-sat installation - so one coax (although one assumes this could be
powered locally) and one fibre carrying both bands (but probably as a
continuous band) in both polarities instead of four coax.

The other big advantage is the much lower losses through fibre as compared
with CT100 (or better) is the far lower losses. This means that the dish
can be quite a long way from the receiver (like on top of a hill) in places
where there is no clear view of the Clarke belt.

In addition it is a relatively simple matter to split and amplify the
optical signal.

Are there any optical amplifiers for 1310mn? The LNB will need a 1550
laser. And optical amplifiers are definitely not cheap.

I expect this may get developed, since the power for the LNB is fairly low,
so visible light could be transmitted the other way to provide sufficient
energy to run the LNB. They will also connect direct to receivers.

An AM laser carrying a full channel loading between 1 and 5GHz is going
to need a fair amount of electrical power. To transmit 'optical line
power', you're going to need a 'James Bond' laser . [Bear in mind that
anything more than an apparently piddling 20dBm is getting 'quite
scary'.]

I will certainly be looking seriously at them to fit on a Wavefrontier SMATV
for two blocks of flats - a doddle compared to long lossy multiple runs
between the blocks.

--
Ian

In addition it is a relatively simple matter to split and amplify the
optical signal.

Are there any optical amplifiers for 1310mn? The LNB will need a 1550
laser. And optical amplifiers are definitely not cheap.

Why do you think the LNB will need xmit at 1550? The literature the OP
referred to at
http://www.triax.co.uk/Products/Fibr...cal%20LNB.aspx

stated the LNB used 1310 technology.

I expect this may get developed, since the power for the LNB is fairly low,
so visible light could be transmitted the other way to provide sufficient
energy to run the LNB. They will also connect direct to receivers.

An AM laser carrying a full channel loading between 1 and 5GHz is going
to need a fair amount of electrical power. To transmit 'optical line
power', you're going to need a 'James Bond' laser . [Bear in mind that
anything more than an apparently piddling 20dBm is getting 'quite
scary'.]

Optical line power at 1310 can be as low as -5dBm, depending on the
span length and the quality of the reciever. I would suggest that the
line lengths likely to be encountered when using one of these LNB's
will be very short - 1Km
--
Cheers

Peter

On Thu, 28 May 2009 11:51:42 +0100, Petert
wrote:


In addition it is a relatively simple matter to split and amplify the
optical signal.

Are there any optical amplifiers for 1310mn? The LNB will need a 1550
laser. And optical amplifiers are definitely not cheap.

Why do you think the LNB will need xmit at 1550? The literature the OP
referred to at
http://www.triax.co.uk/Products/Fibr...cal%20LNB.aspx

stated the LNB used 1310 technology.

I expect this may get developed, since the power for the LNB is fairly low,
so visible light could be transmitted the other way to provide sufficient
energy to run the LNB. They will also connect direct to receivers.

An AM laser carrying a full channel loading between 1 and 5GHz is going
to need a fair amount of electrical power. To transmit 'optical line
power', you're going to need a 'James Bond' laser . [Bear in mind that
anything more than an apparently piddling 20dBm is getting 'quite
scary'.]

Optical line power at 1310 can be as low as -5dBm, depending on the
span length and the quality of the reciever. I would suggest that the
line lengths likely to be encountered when using one of these LNB's
will be very short - 1Km

Just checked - the LNB at
http://www.triax.co.uk/Products/Fibr...cal%20LNB.aspx

transmits a 7dBm which should be plenty!

(Some will correct me if I'm wrong, but I make that to be about 8mW)
--
Cheers

Peter

The message
from Petert contains these words:

====snip====

Just checked - the LNB at
http://www.triax.co.uk/Products/Fibr...cal%20LNB.aspx

transmits a 7dBm which should be plenty!

(Some will correct me if I'm wrong, but I make that to be about 8mW)

Wrong! +7db mW approximates to a power level of 5mW (it's 3db shy of 10mW)

Consider yourself corrected! ;-) However, your figure is well within
"The Ball Park".

--
Regards, John.

Please remove the "ohggcyht" before replying.
The address has been munged to reject Spam-bots.