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Applications
Masthead amplifiers are designed to boost and distribute the signal from an outdoor aerial and
are fitted as close to the aerial as possible to minimise signal loss and interference.
Aerials that are fitted indoors may have compromised performance with both lower signal levels
and a higher pick-up of noise.
LMA amps are fitted with a Class 3 4G filter however if you wish to receive TV on Channel 60 you
should use a Labgear LDL DigiLink Class 0 indoor amplifier, you may also need a Channel 60 4G
filter (currently available from at800 free of charge).
LMA amps do not have an IR return path to enable channel changing from remote locations.
LMA113R – Pre-amp
Ideal to overcome longer cable runs or lift signals with intermittent problems
LMA125VR - Amp with variable gain
By incorporating variable gain this amp can be used in a range of situations, setting the gain at
the optimum level to raise a weak signal or boost to overcome long cable runs.
LMA209R – 2-way distribution amp
Boosts the signal to overcome splitting and longer cable runs
LMA415VR – 2-in, 4-out VHF/UHF variable gain distribution amp
Every popular option built into one product to ensure you have the right tools for a wider range
of applications. TV and Radio signals can be distributed to 4 points. Weak TV signals can be
boosted.
Fixing Methods
Mount the amplifier on a vertical section of the mast
below the antenna using the built-in mast clamp
shown opposite. The amplifier will not be affected
by proximity to the antenna, but reasonable
clearance - a minimum of 300mm - should be
maintained to avoid disturbing the antennas
performance. Otherwise for minimum signal loss
mount as close to the antenna as possible.
Labgear masthead amps can also be screwed
onto a vertical surface in a loft using the screw
points in the housing with the bracket folded down.
Signal connections
Input and output connections to the amp are made
using F-type (IEC 60169-24) connectors.
Connections can be made using a tool for crimp or
compression connectors or by hand with twist-on
connectors (see Fig.2). Ensure that the correct size
connector is used to match the size of the coax cable.
Make sure that the external connections are adequately
weatherproofed to prevent water ingress which could
damage your amplifier.
The module in the housing can be tilted out to make
connection easier. Tighten the connector using the spanner
provided but do not over tighten. After making the connections
make sure that all cables are aligned with the slots in the housing before closing.
Make sure the locking catch clicks home and the housing is closed securely.
Applications, and Installation
Bracket folds down
for mounting on a
flat vertical surface
Fig. 2
cut or tear
away foil
fold braid back
over sheath
6mm
screw connector
body onto cable
COMPLIANT
Mast
Clamp
8mm
inner wire
end of
insulation
should be
flush with
this face
2mm approx.
3
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