Multiswitch Operation Sat/TV Coupling
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matousurnet Posted messages 1179 Registration date Status Member Last intervention -
matousurnet Posted messages 1179 Registration date Status Member Last intervention -
Hello,
I wanted to know how the Multiswitch works when there is both terrestrial and satellite coupling, how is the connection made?
Does the Multiswitch also act as a TV/SAT coupler?
What is the disadvantage of using a single LNB head for 3 receivers?
What is the advantage of using a 3-head LNB for 3 receivers?
I wanted to know how the Multiswitch works when there is both terrestrial and satellite coupling, how is the connection made?
Does the Multiswitch also act as a TV/SAT coupler?
What is the disadvantage of using a single LNB head for 3 receivers?
What is the advantage of using a 3-head LNB for 3 receivers?
3 answers
Good evening,
So in order: the TV-satellite coupling is done in the multiswitch (no worries) the connection? Well, the UHF input is where the antenna goes, and in the four cables for each of the satellites used (personally I have a 17/8 multiswitch) that’s four satellites with 4x4 cables and 1 for the antenna which makes 17 inputs for 8 outputs (I power four receivers each with at least two satellite tuners and one or two UHF tuners)
The disadvantage of using a simple LNB for three receivers? Well, you risk burning the LNB in the best case, or the LNB AND the receivers in the worst case: why? Because in an LNB there are four sub-bands (vertical, horizontal, and low and high bands), so if one receiver requests a channel on the low and vertical band, and another receiver requests a horizontal channel, well the LNB can't handle that!! And therefore it reacts very poorly
That’s why on a multiswitch we use quattro LNBs (which use the four sub-bands separately from each other)
Three LNBs hardly exist we’re talking about twin or quatwin LNBs which have two, four, or eight outputs to independently power the two or four receivers (or three with one output unused)
I think we’ve covered everything if you’re indeed talking about multiswitch and not DiSEqC...
So in order: the TV-satellite coupling is done in the multiswitch (no worries) the connection? Well, the UHF input is where the antenna goes, and in the four cables for each of the satellites used (personally I have a 17/8 multiswitch) that’s four satellites with 4x4 cables and 1 for the antenna which makes 17 inputs for 8 outputs (I power four receivers each with at least two satellite tuners and one or two UHF tuners)
The disadvantage of using a simple LNB for three receivers? Well, you risk burning the LNB in the best case, or the LNB AND the receivers in the worst case: why? Because in an LNB there are four sub-bands (vertical, horizontal, and low and high bands), so if one receiver requests a channel on the low and vertical band, and another receiver requests a horizontal channel, well the LNB can't handle that!! And therefore it reacts very poorly
That’s why on a multiswitch we use quattro LNBs (which use the four sub-bands separately from each other)
Three LNBs hardly exist we’re talking about twin or quatwin LNBs which have two, four, or eight outputs to independently power the two or four receivers (or three with one output unused)
I think we’ve covered everything if you’re indeed talking about multiswitch and not DiSEqC...
Hello, good evening to the night owls...
Well... not knowing which receiver demo you are using, it's difficult for me to respond
However, a good receiver (like E2 under Linux) connects well to your cat 6 network (if it can do more, it can do less; I still have some cat 5 and it works very well)
That said: the box and the receiver on the network (that’s fine) but it remains essential if you want satellite, to still have the coaxial cable that brings it to you; otherwise, your receiver will be limited to IPTV
Which brings us back to my first question: which receiver (and for what purpose?)
because if it's receivers like TNTSat or Fransat...(there's no point in connecting them)
Hey? I'd love to have a coffee...
Well... not knowing which receiver demo you are using, it's difficult for me to respond
However, a good receiver (like E2 under Linux) connects well to your cat 6 network (if it can do more, it can do less; I still have some cat 5 and it works very well)
That said: the box and the receiver on the network (that’s fine) but it remains essential if you want satellite, to still have the coaxial cable that brings it to you; otherwise, your receiver will be limited to IPTV
Which brings us back to my first question: which receiver (and for what purpose?)
because if it's receivers like TNTSat or Fransat...(there's no point in connecting them)
Hey? I'd love to have a coffee...
Hello,
the new Canal set-top boxes are capable of receiving satellite and/or IPTV (over the internet) and switching between the two reception types effortlessly. Therefore, the coaxial cable from your satellite dish must be connected to the set-top box, as must the internet cable (or Wi-Fi).
But I don't see what you want to do with your UTP cables and the coaxial cable??
A junction?? For what purpose, and for what reason?
the new Canal set-top boxes are capable of receiving satellite and/or IPTV (over the internet) and switching between the two reception types effortlessly. Therefore, the coaxial cable from your satellite dish must be connected to the set-top box, as must the internet cable (or Wi-Fi).
But I don't see what you want to do with your UTP cables and the coaxial cable??
A junction?? For what purpose, and for what reason?
Technically speaking, what is the distance of the cable between the dish and the decoder?
Does the Multiswitch also amplify the signal?
The distance between the satellite dish and the decoder ?? big topic, I'll try to simplify it!
Let's take the dish (simple with one head and one satellite); the larger it is, the more signal it receives, and thus the more signal remains at the decoder (logical since the head (LNB) is positioned at the maximum point of the ideal focal point of said dish)
But if you use a dish with multiple heads, like the BIG BIG sat from Visiosat (1, 2, 3, 4 or more), you'll have one head perfectly pointed at its satellite while the others will be more or less off-point (depending on the targeted satellites), causing a loss of dBmv (decibel microvolt, a measurement system used (among others) in the field meters used by the pros.
So we have a signal that is more or less strong to pass through a coaxial cable to the decoder...
This will partly depend on the cable used; here, it mainly depends on the distance of the cable from the dish (assuming optimum adjustment on a single-head dish of 80/85 cm). Below 30 meters (no need to bother, an off-the-shelf cable is more than enough...)
Beyond that, you have to calculate the loss in the cable used; all cables are referenced by a number and a series of letters (e.g., 19 vatc); we will only take the number (let's keep it simple). The loss is inversely proportional to the number indicated, so a 25 vatc cable is worse than a 19... which itself is worse than a 17, etc.
You can find 17 in stores (GSB = Grand Surface de Bricolage) 17 which corresponds to the thickness of the central core made of copper (note the price difference between two cables is due to their design. E.g.: a cheap 17 has a core made of steel coated with copper, while a good quality 17 has a 100% copper core, copper being much more conductive than steel but also much more expensive)
It's simple (uh, not sure) let's make it simpler: the indicated number is the loss per 100 m of cable at a frequency of 862 MHz (but 862 MHz doesn't correspond to the frequencies used by the satellite...(ouch!! simple is off to a bad start!)
NO, no! simply put, you take the number indicated on the cable and multiply it by two to get the loss (at an average satellite frequency), so in our example: 17 x 2 = 34 dBmv of loss over 100 meters of cable that you will divide by the actual footage used at your place.
And a quick note for the second question: does the multiswitch amplify the signal? It depends on the brands... some do, others don’t, some only amplify UHF, others both UHF and satellite... it's very variable, hard to answer without knowing the brand and model.
So, not too long?
Come on, hang in there!
The splitters? 5-2400MHz for us French, which can be used for UHF and satellite and all outputs allow current to pass
But it's an aberration since in satellite we NEVER use splitters (that's simple)
But I have a problem, I am currently doing an installation. I have a Multiswitch with 4 Sat inputs + 1 terrestrial and 8 outputs.
I have installed a single LNB, and I have one decoder.
I connected the incoming LNB to the VL port, the signal quality is at 80% good, but the search result gives me 70% of channels.
Where could the problem be?