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Hotel TV systems - headends and amplifiers
One of the criteria for classification of TV systems in hotels is the programming to be distributed. The simplest systems may provide only free-to-air terrestrial TV broadcasts, whereas more advanced solutions will include satellite channels, also some premium ones (pay-TV). The content required by the owner/investor will depend on the categories of prospective hotel guests (foreign and thematic channels etc).
Transmisia semnalelor HDMI
HDMI este acum cea mai comună metodă de conectare în surse a diferite tipuri de conținut multimedia. În situațiile în care este necesară transmisia semnalului HDMI pe o distanță mai mare de 30 metrii (distanța maxima a unui cablu HDMI), sau într-un loc unde un astfel de cablu nu poate fi instalat, este indicat să folosiți un media convertor ce vă permite transmisia semnalului de la sursa HDMI cu ajutorul altor tipuri de cablu, mai pretabil pentru sistemul respectiv.
Modulatoarele DVB-T - modele şi utilizări practice
Procesul prin care semnalele audio-video (A/V) în banda de bază (de frecvenţă joasă) sunt transformate în semnale de radio frecvenţă (RF) se numeşte modulare. Astfel este posibilă transmisia de informaţie provenită de la o gamă largă de surse de semnal, cum ar fi calculatoarele personale, DVD playere, camere de supraveghere video, etc. prin intermediul unui sistem de antenă. Dispozitivul folosit în acest scop (modulatorul) este echipat cu un set de intrări A/V (SCART, RCA, HDMI) şi o ieşire RF. Semnalul obţinut la ieşirea RF a modulatorului este introdus în sistemul de ...
TERRA multiswitches - new quality of SMATV systems
TERRA products dedicated for shared antenna systems are first-class equipment with a four-year warranty. SMATV distribution networks based on these devices ensure reliable operation for a long time.
Professional multiswitch systems
Article on small, medium and large multiswitch installations. How to choose proper multiswitches and cabling. Use of multiswitch systems for distributing terrestrial TV signals.
Multiswitch installations allow to distribute satellite and terrestrial programs to many users, being one of the forms of satellite master antenna TV systems (SMATV). Community systems are generally more reliable and ensure better quality, due to better, professional equipment. It starts from the satellite dish - at least 110cm, ensuring high gain and insensitivity to weather conditions. Community installation ...
Choosing a multiswitch...
The choice of a multiswitch depends on the number of users, received satellites and bands, and employed converters (LNBs). We have worked out table and diagrams, which are useful for those who want to crystallize their plans of building SMATV system. As example multiswitches we mainly present Terra devices, although the instances given can be considered as a general concept.
Satellite converters - LNBs
Satellite converter (often called LNB - Low Noise Block) is the device used for amplification and transition of signals from the ranges 10.7-11.7 and 11.7-12.75 GHz into the band of first intermediate satellite frequency (IF - 950-2150 MHz).
TV Amplifiers - Classification
Antenna amplifiers, channel amplifiers, building amplifiers, multi-input amplifiers, band amplifiers, RF amplifiers, preamplifiers.
Theory and use of channel amplifiers
A common problem that is encountered in terrestrial TV antenna installations is unbalance of the level of received channels, often about 10-20 dB. In case of small installations (5-20 outlets) such a difference (not recommended) usually doesn't make any trouble yet. It is the real problem for bigger installations, where the difference of levels at the input is increased by inconstant (being a function of frequency) attenuation of cables and may easily exceed (in an outlet) the accepted limit (12 dB) all over the band.
Audio - Video modulators
Modulators are used for distribution of audio/video signals from different sources (cameras, SAT receivers, DVD players etc.) via the existing antenna installations. The signal coming from a modulator can be received by any TV receiver.
SIGNAL - splittere, tapuri şi prize TV
Ghid PDF pentru a alege componentele pasive ale unui sistem de distribuţie TV.
Splitters and taps
To ensure proper S/N ratio, the isolation between any two receivers should be at least 50 dB.When the receivers are connected to the same tap, the isolation depends on the Ao, A, and As attenuation, and the lengths of the cable between tap outputs and subscriber outlets.
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