Labgear CM 7283 Installation Instructions

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Labgear
Kingfisher Wharf
London road
Bedford MK42 0NX
Tel: 01234 263737

Installation Instructions

CM 7283 VHF-UHF single input
MATV Distribution Amplifiers
Introduction and Applications
These fully screened amplifiers are ideal for handling TV and FM DAB radio signals in
small and medium sized MATV distribution systems. These amplifiers have a single
output and are used in conjunction with a passive distribution network built using
splitters and taps (also available from Labgear). Advice on required.
CM 7283
This is single input wideband amplifier covering Bands to 40-862MHz, VHF and UHF with
its own gain control should be used where the signals from VHF and UHF antennas have
been combined before reaching the amplifier.
Digital applications
Both units are suitable for handling digital terrestrial TV(DTT) signals in addition to the
analogue services.Distribution of DTT signals requires careful attention to system design
and to signal levels for satisfactory results.
Using a UHF pre-amplifier
In weak UHF signal areas, or where a long downlead cable run is required, it may be
desirable to use a masthead preamplifier mounted close to the UHF antenna. These MATV
amplifiers feature built-in12V input line-powering; there is no need to use a separate
power unit for the masthead amplifier.
The built-in line-power is rated at 40mA (fully short-circuit proof) and is compatible with the
majority of Labgear masthead preamplifiers.
The preamplifier gain used should be kept to a minimum and generally only needs to
exceed the down lead cable loss by about 6dB. A single-stage15dB gain masthead
(PUM111) will be suitable for the great majority of applications. Use of excessive amounts
of gain will lead to severe cross-modulation and intermodulation problems.
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