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Use with a UHF preamplifier
In weak UHF signal areas, or where a long cale downlead cable is
required, it may be desirable to use a masthead preamplifier mounted
close to the UHF antenna. These multi-way amplifiers feature a built-in
12V line powering on the UHF input; ther is no need to use a separate
power unit for the masthead amplifier.
The built-in line power is rated at 25mA (fully short curcuit-proof) and is
compatible with the majority of Labgear masthead preamplifiers. The
masthead gain should be keep to a minimum and genarally only needs
to exceed the downlead cable loss by about 6dB. A single stage
12...15dB gain masthead will be suitable for the great majority of
applications. Use of excessive amounts of gain will lead to severe cross-
modulation and intermodution problems.
Important note: attention is drawn to the General Safety Precautions Panel on page 4 which contains
advise refering to safe installation and operation of these products.
Location
Choose a location for the amplifier from which it is convenient to run cables from the antennas and to the
system outlets. Typical examples of suitable locations are a loft space or a cupboard. In weak signal areas it
is helpful to keep the antenna cables as short as practicable.
Select a cool, dry location to install the amplifier. This meansa location where the ambient temperature will
remain between -10°C and +40°C, and which is free from risk of dripping or splashing water.etc.
The fixing location should allow adequate access to the equipment for wiring and maintenance. Clearence
of at least 25mm should be allowed around the top and left hand side of the unit for ventilation.More
clearance will be needed under and the right of the amplifier to allow access for cables.
Fixing
The amplifier should be be fixed to a wall or other suitablehard surface, using suitable screws and masonary
plugs(not supplied). The amplifier should not be left supported by its own wiring, nor should it be left
resting on a carpet or other insulating and/or inflammable surfaces.
Electricity Supply
Fixed wiring and connection of the electrical supply to these products should be carried out in accordance
with BS7671 (IEE Wiring Regulations) .
Each amplifier is supplied with afitted 13A mains plug. If this is not suitable, see General Safety Precautions
Panel on page 4.
As an alternative to the use of plug and socket connection, the amplifier may be connected to the supply
using a switched fused connection unit BS 1363-4. A 3 Amp fuse to BS 1362 should be fitted in the fused
connection unit.
If the power unit is connected to the supply other than by means of its fitted fused plug or a fused
connection unit, It must be protected by a non-time delayed fuse or a type B MCB at the distribution board
of rating not exceeding 6A. An isolating switch should be provided near to the unit to allow it to be
disconnected from the supply when necessary.
Signal Connections
Input and output signal connections are made using 'IEC' (IEC 60169-2) connectors. Good quality plugs
should be used, preferably of the crimp on type. Attention is drawn to the need to maintain DC continuity
throughout the system for correct operation of infra-red remote control functions (MSA d range only).
The "FULL" output must always be terminated in a well matched 75Ω load. A 75Ω terminator is supplied.
Model Number
MSA242
Number of Outputs
4
Gain to numbered outputs
8dB
Gain to full output
Noise figure
4dB
Output capability from
96dBμV
numbered outputs
Output capability from
75Ω
FULL output
FM DAB
88-230 MHZ
VHF EIR version
40-270 MHz
Line power
25mA
Power requirements
230V AC 50Hz@ at <7VA
Installation
MSA262
MSA282
6+1
8+1
+1 indicates "FULL" output
8dB
8dB
18dB
18dB
4dB
4dB
85dBμV
85dBμV
99dBμV
99dBμV
Must be terminated in
with auto shut down
Supplied and fitted Mains Plug to BS 1363
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