Dokumentation

Excellence is a goal that is never really achieved, it is a philosophy that takes each day as a process of continuous improvement. It is therefore particularly pleasing when an industry benchmark uses the word excellent to describe the results of your effort.

The prestigious German magazine Digital Fersenhen has given Televes QSD85 the highest rating in a report titled "Spanish Quality", which presents the results of a comprehensive analysis of satellite dishes in the competitive German market. QSD85 is highlighted for ease of installation, long-term quality and signal reception levels, with C/N values between 14.3 and 15.6 dB. In summary, QSD85 is at the same level of performance as the first German manufacturer of reference, but with the advantage of a much more competitive price..

QSD s the premium line of Televes dishes. Approved by the TÜV institute, they are characterized by using advanced CAD design, leading to accuracy in signal reception, as well as durability. These aluminum dishes deploy a sturdy Zamak support for fixing the LNBs, with hidden wiring for a professional look to the installation. They feature stainless steel hardware and mounting brackets which also undergo a process of hot dip galvanization to grant higher resistance to corrosion. Another strength of the range lies in the ease of assembly on-site, which takes place in four simple steps. The support arm and the LNB, which is adjustable in height, are preassembled from factory.

This is not the first accolade received by the QSD in Germany. Last year, experts from another highly regarded magazine in the industry, Satellit Empfang + Technik, also highlighted the quality of signal reception and ease of installation of the product, giving a score of 88 out of 100, placing it above the other two leading manufacturers compared.

If you were to travel to Mora (Toledo), you could still see, although out of service, an old motorized antenna. The curious thing about the picture is that, to avoid the obstacles which prevent the reception of all satellites in the "Clarke Belt," the antenna needed to be lifted.

The oldest installers might remember the difficulty of adjusting this type of satellite dishes, but if that adjusting porcess was to be carried on the top of a turret, the merit is even bigger. Is that so, that they don't even contemplate the possibility of disassemble it.

In the areas affected by the LTE/4G signals there is a risk of interference with DTT channels. Most of the incidents occur in areas where DTT is propagated with difficulty and with CBER and MER values ​​even below the desired minimum. In these situations, any variation on the condition of the spectrum (as the appearance of unbalanced signals, affecting active devices) increases the risk of degradation of the television signal.

In this situation, the installer can choose between several solutions to find the one that best suits the reception conditions.

The most obvious option is to install a filter. There are different selection criteria to choose between the different filters of Televes, where signal rejection is often seen as the main one. But when choosing the filter we also need to consider carefully the value of insertion losses, as it can be critical in situations like the one described. This is the reason why Televés, when designing filters, pays special attention the insertion loss in the highest channel.

If the signal recieved is too low, the filter is used to prevent the signal to be degraded as it passes through the amplifier, though it will not help to improve the reception conditions. In this situation is more suited to use an active element that is as immune as possible to the LTE band, wich allows to improve the MER of the signal coming from the antenna. That element is the QBOSS, integrated (or not) in the antenna DAT HD 790.

The combination of a DAT HD 790 together with a filter with DC pass can be considered as the complete solution, especially in installations where the amplifier is set at maximum gain.

Therefore, experience shows that certain actions can be carried out to increase the distance to the "digital cliff." Which one to choose will depend on the type of installation, frequencies of the signal  and the level difference between DTT and LTE/4G signals.

What looks to be clear is that the three possible actions to take, one of them or in possible combinations, are: Installation of filters with high rejection and low pass-band attenuation. Using DAT HD 790 antenna in active or passive mode.Activate the QBOSS.

The typical configuration of a CoaxData network has a master, in the 7692 range, and several slaves, also in the 7692 range or ref.76930 CoaxData Gateway.

But if the desired functionality is that the master itself works as a router with full functionality, including the  network connectivity via WiFi, the solution is to configure a CoaxData Gateway ref.769301 as a master.

To do this, the internal architecture of the device must be configured using a configuration file available on Televés website:

http://www.televes.com/en/node/26934

Once loaded the configuration, this new master will have the following characteristics:

• WAN input associated with a DHCP client for connection to a main router (operator router) through the LAN/WAN ethernet port.
• LAN outputs associated with a DHCP server: LAN1, LAN2, Coaxial port eth0 and WiFi ath0.
• Functionality as a master that extends the LAN through the coaxial network and through the ethernet network (UTP / FTP).
• It has a configuration interface through a VAP, that allows access to the configuration options regardless the possible changes of the internal configuration of the router.