Dokumentation

Televes Deutschland GmbH, Televes Corporation’s subsidiary in Germany, increased its sales by 8% in 2009 and 12% in 2010, and this year the goal is to consolidate this rapid pace of expansion.

Boosting exports
Growing in Germany also implies moving forward in Televes Corporation’s internationalisation plans, with the purpose of balancing domestic and international sales 50/50. Exports currently account for 41% of the company’s turnover. It has subsidiaries in nine countries (Portugal, France, Germany, the UK, Italy, Poland, the United States, China and the United Arab Emirates) and enjoys commercial presence in over 80.
The growth strategy in Germany includes a transition plan to stop using the Preisner brand, which was the company’s rst in this market, and use the Televes name on all company products. This plan has been met 70% up to now.
One of the initiatives developed by Televes Corporation to strengthen its corporate image in the German market was Passion for Quality tour, which was launched in the city

 

of Oldenburg last September. From there it travelled through much of German geography.
Avant-garde equipment
Among the Televes products presented at ANGA Cable 2011, we can highlight the following:
T0X distribution head-ends. The result of Televes engineers’ eorts to develop a solution for maximum eciency in terms of energy consumption per service distributed. They are prepared for the distribution of any of the modulation standards currently available and incorporate innovative features that facilitate the work of professional installers and enable them to carry out fully customised congurations.
H45 eld meter. This revolutionary equipment was Televes’ rst step in digital processing in portable measuring equipment and has now
been fully updated with measurements in DVB-T2, the full interface for measurements on bre optics and an advanced spectrum option of up to 3 GHz.
  New line of QSD dishes. Antennas for the reception of high quality satellite television signals and prepared to withstand the harshest environmental conditions, thanks to a meticulous hot dip galvanising process for components

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These new High Quality Oset Antennas, 750 and 850 mm sizes, are made of aluminum and are the solution to the environments in which the corrosive activity is very pronounced. Lowerquality antennas made of steel and with a layer of paint undergo fast mechanical degradation in such areas (the degradation rate depends on the treatment applied to the steel and on the thickness of the paint); this leads to failures in the satellite signal reception and can even pose an hazard if they fall from their support.
The High Quality antennas we oer are featured by:
1. Aluminium dish with LNB holder made of diecast
2. Preassembled support and arm
3. TÜV license validation
4. Robust xation support. Hot dip galvanized
5. Foldaway support for quick and easy installation

6. Cable xing inside the LNB arm



On the other hand, the robust structure of the bracket and the fact supplied pre-assembled with no other task but to open the LNB arm which is folded over the dish, ultimately contributes to reducing costs, both assembly and maintenance.
The articulated arm of the LNB is not only easy to install in its nal reception position; it also includes an inner xing system for the coaxial cable through various tabs distributed longitudinally which, once folded over it, avoid it to move, as well as helping to improve

the aesthetic of the whole.These antennas are TÜV approved, undergoing rigorous tests of safety, quality and environmental compatibility to obtain the attesting certicate for our customers.
Taking into account its excellent electrical performance and the already mentioned qualities of mechanical stability, these antennas are especially recommended for all installations of SMATV made in aggressive environmental conditions, and as a replacement product for those users who have had repeated experiences of oxidation in the antennas oered by satellite operators

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Nowadays, with the crisis hitting us and the rise in energy prices, more and more users take care of the consumption of their appliances, including the DTT adapter.
Within the range of DTV receivers that can be found in the market, apart from its technical specications to receive the TV signal, there are a wide variety noted for its high power consumption.
Wetook a sample of 4 DTT receivers, and madean assessmentof theirconsumption,
 

considering a very conservative average running time(4.5

hours/day), andtherest of thetimeinstand-bystatus(19,5 hours/day).
Taking our zAs HD ref. 5124 as the reference, three others have been

 analyzed, considering that their low power consumption is advertised by them on their low prize.
The result is:
Receiver 1 consumes 6.56 times more than the HD ZAS
Receiver 2 consumes twice the HD ZAS
Receiver 3 consumes 1.18 times more than the HD ZAS
Summarizing, the electricity costs during the receiver's lifetime are quite more expensive than its purchase price 

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The real coverage

The DTT coverage depends directly from the electromagnetic eld that covers certain area, but it also depends from the reception system and the receiver installed. The reception quality in a certain area between a DTT PEN receiver and a reception system with external UHF antenna can not be compared.
Therefore, the coverage in certain areas depends largely on the quality of reception and tuning system.
For areas of low or good coverage, the antenna DAT HD Boss, ref. 1495, automatically adjusts its signal output to a

correct value for the DTT receiver.
Another factor that depends on receiving DTT or not, is the dynamic range of the receiver. The zAs HD ref. 5124, features an input dynamic range (range of levels from which the recipient can work) between 45 and 90 dBuV, assuring the DTT reception in pretty extreme conditions of signal level. Moreover, eld tests have demonstrated the possibility of receiving DTT with signicantly lower levels (see figure).

In conclusion, in a certain area, it may be impossible to receive the DTT with certain receivers, while with others, it is possible. To determine whether there is really DTT coverage, try with a DAT HD Boss antenna and with a DTT zAS HD receiver according to the figure!.If in these conditions you can not receive DTT, then there is really no coverage in the area.

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Most common types of connectors:
Below you will nd a short despription of the most commonly used connectors; they will be classied according to two basic characteristics:
  According to its physical structure: ST, SC, FC, LC connectors
  According to the bre polishing type: PC, UPC, APC connectors ST (straight tip)
This type of connector is an AT&T trademark. It features a bayonet mount with a long ferrule (ceramic, metal or plastic) that holds the ber. They are spring loaded so they must t perfectly.
When they cause much losses, it has to be separated and bound again.
SC (Straight Connection)
It is a snap-in type connector, very popular due to its excellent performances.
It latches by means of a push-pull action. It also exists in double version.

To avoid these problems the ber is cut in angle thus reducing the reflection.
PC (Physical Contact) type
When this angle was "handmade" having approximately 30º and featuring 30 dB ORL (optical return loss).
  UPC (Ultra Physical Contact)
When the cut was polished with a machine obtaining a super/ultra nishing featuring 40/50 dB ORL respectively.



  APC (Angled Physical Contact)
When more rejection is required this polishing features a 8º angle which guarantees more than 60 dB ORL.

 

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