32 replies to this topic

[Erik Slagter]

This question has been asked before with no clear answer.  Would be grateful if somebody could actually explain how to use multiple Jess LNBs on a setup.

 

There is quite a large text about it in the Dutch section, someone who did all the steps and documented them. That won't be of much help for you, maybe google translate can help. Fact is that there are not many JESS users in non-professional environments, so you won't find much documentation on how to use it. The JESS LNB stuff can be a bit complex, for some setups you need to have a programmer ($$$). Connecting standard "quattro" LNB's to a JESS switch is a piece of cake though, everyone can do it. But then the switch itself is $$$.

 

I have a JESS switch, no JESS LNB's so I can't help you there.

[Erik Slagter]

You mean Unicable LNB's without a switch?  JESS is a Unicable II protocol from Jultec, for their switches.

 

Actually, JESS is THE Unicable II protocol. The name "Unicable II" solely exists because Inverto refuses to use their competitor's brand name, but it's really the same and yes, Jultec "invented" it and also had it registered. And yes Unicable or JESS LNB's use exactly the same protocol as the Jultec switches. The only difference seen from a receiver is that an inactive JESS LNB goes into "off" state when not used and needs some time booting up when selected. This will discard the first command tries, so they will need to be repeated. A JESS switche is always active and listening. It may choose to switch of individual LNB's and it won't interfere with JESS operation.

[Erik Slagter]

Yes, I am referring to LNBs. What protocol are used for these LNB's please?
 

• GT-Sat GT-S1DCSS24 SCR/dCSS Single Cable Unicable II LNB SCR24 with 1x Legacy Outputs
• Inverto IDLU-32UL40-UNB00-0PP

I know that there is a combiner (nobody has ever posted a link to one or details) and an expensive programmer for the Inverto units.

 

Inverto calls JESS -> Unicable II, so yes, it's plain JESS.

[Erik Slagter]

@Zeros, Jess/Unicable 2 and FBC are different technologies. Which are you asking about?

 

They are commonly confused though. Probably because you can only use all 8 tuners independently using SCR. If your provider has layed out it's transponders in a smart way, you may very well have the same capabilities without having to use SCR...

[zeros]

Erik, just wondering how many LNBs you have? Is it 4, or am I misunderstood that? If more, than 4, then how are they connected?

[Erik Slagter]

I have 8 LNB's. For that to work you will need a switch setup that will accept eight quattro (!) LNB's and eight LNB inputs. If you only have two positions, you can get away with a Unicable switch, which are quite affordable. Using two cables and two switches and two FBC inputs, you can extend that to four positions. For more than four positions, it will get expensive, anyway. At least, if you want all eight tuners to be independent.

 

Some switches also accept quad LNB's, but they're more expensive, so why bother. Mine doesn't.

 

EDIT: I see wanwizard already mentioned this.

Edited by Erik Slagter, 2 December 2020 - 19:47.

[WanWizard]

There are switches with 16 inputs ( for 4 quattro LNB's) that also accept wideband LNBs, in which case you can connect 8 (as they only need 2 ports instead of 4 per LNB). But those aren't cheap either.

[Frenske]

I once delivered  Unicable II setup with two wideband LNB’s and one Unicable switch. If you add a second Unicable switch + two extra wideband LNB’s you will be able to receive 4 satellites on max. 32 tuners. Theoretically. I will look for the layout in an hour.

[Erik Slagter]

I am still waiting for JESS switches to be in the same price range as Unicable switches, they have a reasonable price. But I think we will need to have more patience there.

[Frenske]

This is the layout I used about a year ago at my nephew’s home in Germany.

 

1 simple Triax TD 78 dish.

1 Triax multibeam mount. Max. 4 positions.

2 x inverto Widebeam lnb’s 

1 x Inverto Unicable switch. 
 

When you want this setup for four satellites, simply use this hardware twice and connect them to each other through this schematic diagram. 
You also need one or two power injector and a combiner. Possibly the reseller has to setup the Unicable switch for the right lnb’s. WB or Quattro. Look at the picture below.

 

Attached Files

•  CE5D7E49-5743-4724-BB75-8B6FC82D423D.jpeg   68.3KB   2 downloads

[Abu Baniaz]

 

 

 

There is quite a large text about it in the Dutch section, someone who did all the steps and documented them. That won't be of much help for you, maybe google translate can help.

 

Can I have a link to thread please?

[Frenske]

Here you are. https://forums.openp...icable-ii-lnbs/

[Erik Slagter]

This is the layout I used about a year ago at my nephew’s home in Germany.
 
1 simple Triax TD 78 dish.
1 Triax multibeam mount. Max. 4 positions.
2 x inverto Widebeam lnb’s 
1 x Inverto Unicable switch. 
 
When you want this setup for four satellites, simply use this hardware twice and connect them to each other through this schematic diagram. 
You also need one or two power injector and a combiner. Possibly the reseller has to setup the Unicable switch for the right lnb’s. WB or Quattro. Look at the picture below.

 
BTW this only works if the switches have support for combining. The combiner is very simple, it does nothing more than an impedance adapted connect-through.
 
Similarly you can "cascade" two four-input JESS switches on one cable, if you configure one of them to be address "EFGH".
 
Another option, which I am using. If you don't mind having two cables into your house instead of one and you don't care there will be static assignment of tuners to either cable, you can simply use two switches (with either 2 or 4 inputs, whatever you like, but 2 inputs has the advantage you can use cheap Unicable switches) and connect both outputs directly to both inputs of your receiver(s). Then assign tuner A and one or more from C D E F G H to the first switch and assign tuner B and one or more from C D E F G H to the second switch. A leaf tuner (C D E F G H) can only be connected to either one. A root tuner needs to be connected to it's physical input ( A B ).
 
In my case I have the more frequently used positions one one switch and less frequently positions on another, then I assign most tuners to the input from the first switch and the two that are left to the other switch. Works like a charm. It can keep the costs really down if you limit yourself to four positions (so you can use Unicable in that case).