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Headend Overview The Headend is the heart and soul of any larger commercial CATV system. The job of a good headend is to process signals from an "off air" Master Antenna signals and / or Satellite (SMATV) and modulation to which then goes through the distribution to end user cable television subscribers.
The broadcast signals routed to the
headend are filtered to reject any unwanted signals from adjacent
off-air channels and adjusted for proper aural and visual carrier
levels in. They can be fed to a signal processor or a demodulator /
modulator approach can also be used.
The CATV headend uses frequency
division multiplexing to combine signals from broadcast TV
processors, satellite fed modulators and locally originated system
specific channels onto a single feed. The combining process is
passive since the signals already occupy discrete frequencies and
have been adjusted to the same RF carrier level by their respective
processing equipment. Passive combiners simply provide multiple
signal ports where different signals are connected and are combined
onto a single output containing all of the input signals. A post
amplifier, sometimes called a launch or distribution amplifier, then
amplifies the signals and provides slope control so that the entire
range of carriers can be at the correct RF level for launching to
the distribution system.
We carry a wide range of Headend systems from various manufacturers as well as from European manufactures including Germany and Italy. Please contact us for the specifics of what kind of head end system you are looking for! We also carry and can custom build MATV filters that will allow only for selected signals and reject all other signals to allow for an equal level of signals from all channels before passing into the distribution amplification system! |
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