OCS Ku LNB?

**vk6xlr** · 16-06-09, 08:49 PM

Do OCS (one cable solution) LNB's exist for Ku? Is there such a beast?
I know they are available for C band, as I have one. I would like one for Ku.

**gw1** · 16-06-09, 10:02 PM

They but I haven't seen any local distributors yet. They're on eBay of course but local stores only seem to have ones at this stage.

Wikipedia have a on the technology.

**vk6xlr** · 16-06-09, 10:42 PM

Originally Posted by gw1

They do exist but I haven't seen any local distributors yet.

Yeah, pity. Had an idea of an experiment.
OCS Ku LNB and Moteck to feed several STB's.

**beer4life** · 16-06-09, 11:21 PM

Originally Posted by vk6xlr

Do OCS (one cable solution) LNB's exist for Ku? Is there such a beast?
I know they are available for C band, as I have one. I would like one for Ku.

Yes they do. Have a look at this thread.

**vk6xlr** · 16-06-09, 11:31 PM

Originally Posted by beer4life

Yes they do. Have a look at this thread.

Nope, not it.
I need Ku only, not a combined one.
Reading the specs on the Ku side, it's universal not OCS.

**gw1** · 17-06-09, 01:05 AM

I agree: that appears to be a C / Universal combo with inbuilt 2-in-1 DiSEqC switch to select between them. It has single output, being the LHS connector. The RHS connector is for a short cable going to the other LNB on the feedhorn.

One Cable Solution LNBs transmit all bands simultaneously, each with different local oscillator frequency, with a small gap between each band. This allows multiple receivers to choose between the available bands independent of what other receivers are tuned to. You can't do with with the above LNB: the DiSEqC switch can be tuned to either C band or Universal, not both at once.

**beer4life** · 17-06-09, 01:51 PM

Originally Posted by gw1

I agree: that appears to be a C / Universal combo with inbuilt 2-in-1 DiSEqC switch to select between them. It has single output, being the LHS connector. The RHS connector is for a short cable going to the other LNB on the feedhorn.

One Cable Solution LNBs transmit all bands simultaneously, each with different local oscillator frequency, with a small gap between each band. This allows multiple receivers to choose between the available bands independent of what other receivers are tuned to. You can't do with with the above LNB: the DiSEqC switch can be tuned to either C band or Universal, not both at once.

G'Day,
Sorry to disagree, but,
You are failing to realise that what ever band or polarity is selected, they are converted to the IF, typically 950 to 2150 MHz of the Box. You simply cannot have multiple signals at the same IF at the same time without birdies and cross modulation.
My understanding is that you can only select One and only ONE of the outputs at a time. That is OCS.
I am also aware that there is a system of Multiplexing, but not available to our current range of Satellite Receivers.

OK, bite my head off, but at least consider the implications.

Kindest Regards, " The Druid ".......

**Kavakid** · 17-06-09, 03:07 PM

I thought all voltage switching lnbs were single cable solution.

In the early days we had a separate feedhorn that you could attach a single lnb to, eg17K california amplifier unit.

That would get you a single polarity and if you wanted the opposite polarity you had to go out side and skew the lnb 90 degrees.

Next came the orthomode feedhorn that you could attach multiple lnbs to AND a cable for each.

Then came the combined LNBF with voltage switched polarity, providing a single cable solution. C or Ku.

**vk6xlr** · 17-06-09, 08:36 PM

Originally Posted by beer4life

Sorry to disagree, but,
You are failing to realise that what ever band or polarity is selected, they are converted to the IF, typically 950 to 2150 MHz of the Box. You simply cannot have multiple signals at the same IF at the same time without birdies and cross modulation.
My understanding is that you can only select One and only ONE of the outputs at a time. That is OCS.
I am also aware that there is a system of Multiplexing, but not available to our current range of Satellite Receivers.

OK, bite my head off, but at least consider the implications.

Wrong, wrong, wrong !!

The whole idea of an OCS LNB is to provide BOTH horizontal AND vertical AT THE SAME TIME.
That is why it is called One Cable Solution.

These specs say it all.

Code:

LNBF C-Band single cable solution 3.7 - 4.2 GHz

Specifications

Manufacturer MTI
Model Number AC15-2CV

Input
Frequency Range H: 3.7 - 4.2GHz
V: 3.7 - 4.2GHz

Output
Frequency Range H: 950 - 1450MHz
V: 1550 - 2050MHz
Connector Type 75Ω Female Connector
VSWR 2.5:1 (max)

Local Oscillator
Frequency H: 5150MHz
V: 5750MHz

This particular C band OCS LNB is available from Sciteq.

**beer4life** · 17-06-09, 11:48 PM

Fair enough, but can you see the problems doing it on Ku.
Are all C bands as narrow that you can do that?

**vk6xlr** · 18-06-09, 12:04 AM

Originally Posted by beer4life

Fair enough, but can you see the problems doing it on Ku.
Are all C bands as narrow that you can do that?

C band is 3.7 to 4.3Ghz, so it's not a problem.
What you will miss out on is anything in extended C band, 3.4 to 3.7Ghz.

Ku would work well in on an OCS LNB, for what's viewable in Australia, at the moment. Once D3 is launched, then it's a different storey as it uses the full 1Ghz bandwidth.

For what I am looking to do, it's not a problem as C1/D3 is not a target satellite.