Well, today we are going to compare the 3 most used technologies. Coaxial Analogical, coaxial digital or HDMI.
The distribution of the signal for televisión, music, or publicity in environments of businesses at restaurants, food courts at malls, or retail is one of the biggest challenges operators of business face today.
In the market there are two types: Analogical and Digital
The analogical ones are much cheaper but it is a challenge to have a stable signal with no interference. Also we have limits about the quantity of screens needed to put on and require operative maintenance.
On the other hand, the signal on the digitals have no loss and are exact. The advantage of digital is that usually one screen has two possibilities:It looks great or it doesn't. After the installation we are going to be sure that its going to be fine for some time. The price of this kind of technology is more expensive but it has operative benefits.
ANALOGICAL SIGNAL
Here the objective is to take the signal from a television box signal to a cable supplier decoder or sky signals in RCA, or digital signal signage. The origin in the signal must be analogical. So that if we have a digital signage box in hdmi, must be converted in an analogical signal.
The two ways of doing it are:
1. ANALOGICAL COAXIAL
This is the cheapest and hardest to handle, so we have to be careful with all the elements that we need. The advantage is that we can put on directly to the tv because 100% of the televisions are compatible with this technology.
The elements you will need are:
a) Coaxial cable: It must be standard RG6 and the materials are copper mesh and copper nucleus. This is important to avoid the loss in the signal.
b) Coaxials splitters: It must be seen with the best impedance posible. Remember that to watch a television without interference we must have at ideally 5 decibels of power and a minimum of 4. The impedance of the splitters indicates to us that we will have a big loss after the division.
c) Analogical amplifiers: These could increase the power of the signal, but usually they need a minimum of 5 decibels of the entry power and it could increase up to 30 decibels, so the strategy is to put an amplifier and then a splitter with 6 exits.
d) Coaxial connectors: It must be RG6 and, the form of attaching them to the cable must be pressurized. That is why we are going to need cutting tools and pressure for the tips. Have to assure that the nucleus of the cable will come out at least one millimeter.
Avoid at all costs to join cable or mix different qualities.
In the analogical sign what comes at the end of the cable is voltage, so that each conexion could be varying the level of voltage it could have interference or a low level signal.
Also, take into account that some cables could get the televisions with more than the necessary decibels, so the image could become saturated, and the colors could change.
3. ANALOGICAL COAXIAL RCA
These could be similar to the last one, only add a Coaxial or RCA connector on the tips of the cables and connect them to the tv, but the recommendation is to acquire an RCA distribution equipment.
These allow amplification of the signal with no loss.
DIGITAL SIGNAL
The signal that goes into the televisions is voltage and packages of data. That is why televisions must decodify the data and show it in images.This shows a sharp image. The digital television systems have mechanisms to mitigate lost and correct data.
We can have two types: 1. Digital Coaxial:
It allows the data to travel to the television through the standard coaxial cable, similar to the infrastructure that we use in Analogical Coaxial. Only that this time it is not necessary to have coaxial amplifiers.
Additionally to all the elements that we use in analogical coaxial we have: a) Coaxial Digital modulator:
This can convert an hdmi digital signal to a digital signal that can be transported in a standard coaxial cable. This is a big advantage. It exists 3 constellations in which this signal can be modulate this signal:
ATSC: It is used in North American televisions.
ISDB: It is used in Central America, Panama and South American televisions. DVBT: It is use in China
All of them have the same signal sharpness. The ISDB signal synchronized faster.
The coaxial cables can get distances up to 30 meters.
The modulars have a power of 90 decibeles, so we can place 20 televisions per modulator, without the necessity of amplifying the signal.
b) Coaxial Digital Decodificador:
It is an equipment that you should place near a television and allows you to receive the signal in coaxial. It connects by hdmi to the televisions. This is not always necessary because 90% of the televisions come with an incorporated decodificator. Including brands such as Samsun, comes with double decodificador ISDB/ATSC.
The process of decodifying a signal it is approximately of 3 seconds. This is why there is going to be a delay on the television connection. This time varies from television to television because the televisions of a superior quality will have a faster decodification.
If the televisions are of different brands, it is not recommended to put them together because it will make a desphase in the signal between each tv.
2. HDMI Digital
The HDMI infrastructure is more expensive, but many times it reduces the operative costs of maintaining the signals on the screens.The signal travels by HDMI cables directly to the tv templates. The bigger the distinction, the bigger the costs get.
We should take into account the estandar being used, because for 4k resolution, everything must be in the version 2.0.
The elements will need are:
1) Splitter HDMI Amplified and in waterfall.
This splitter is important when it requires to be connected to other waterfall splitters, usually the splitters have 16 entries, if you need more screens it is recommended to use this type of splitter.
Some splitter have a manual configurator EDID, to establish the tvs resolution
b) Splitter HDMI Estandar
This conventional splitter can reach up to 16 ports of exit. It is important to know our splitter, because we need to identify the resolution of all the screens connected, and based on that replicate the specific signal in all screens.
For example, if we have 4k screens connected, but one is in 1080, all the screens automatically will set on 1080. Also it is really important to confirm that when a screen we set it comes and goes, the signal will fall on the others screens. This is to avoid any inconvenience in the operation.
c) hdmi cable
These cables that are less than 13 meters are not important, when it comes to the different quality of the manufacturers, because with that signal most of them will work great.
With distances bigger than 13 meters, you must look for copper coating cables and the price of the manufacturer will rise.
Also it's possible to use HDMI cable extensors, so they can travel in UTP, this will allow them to reach a distance between 30 to 60 meters.
100% of the tvs nowadays have an HDMI entrance, but the older the tv is the less resolutions it can handle. For example a 5 year old tv, that supports 720 p to HDMI, won't have the capacity to be used with a splitter next to tv ́s that are 1080 or 4k. The televisions will always have the challenge of compatibility because a 4k TV can produce signals between 480p, 720p, 1080p y 4k. The biggest challenge is to find an infrastructure to find a signal that reaches all of the tvs.
Comparative table:
But the case of the Adstter sources Box allows to show digital signals, 1080p ideal pot digital screens.
We hope this information was useful to you, if you know anyone that will be interested please share it.
