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7 W
IRING UP
The wiring diagram is shown in Figure 10. Use light duty hookup wire of different colours for
each connection and twist the wires together. It was found that shielded cables were not
required.
Most PCB connections utilize 2.54mm pitch polarized headers and mating plugs. These are
inexpensive, give a professional looking appearance and allow easy disconnection and removal
of the PCB if required. The plugs are comprised of a plastic housing and crimp contacts which
slide and click in place. If you don't have a suitable crimper it is best to squeeze the contact
wings around the wire with long nose pliers to hold in place and then solder. Be careful not to
use too much heat and solder as it will make it difficult to insert the contact into the housing.
Not that the microphone socket PTT wires go directly to the PCB but the audio wires connect to
the mic gain pot before going to the PCB.
The power supply connection uses a screw terminal block because of the higher currents
employed.
The antenna connection uses short wires soldered between the antenna socket and PCB pins to
give a low resistance connection. You will also need to install a solder tag under one of the
screws holding the antenna socket for the earth wire.
The loudspeaker is mounted on the underside of the enclosure lid and held in place with 3mm
countersunk screws and nuts. A series of holes needs to be drilled in the lid to act as a speaker
grill.
MST Construction Manual – Issue 1
Page 27
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