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Silva S15 Manual

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Operation Manual S15
Page
46
On the back of the case of S15 there is a antenna socket, a power cable
socket and a jack socket for an external speaker / the GPS input and
NAVTEX input (Fig D).
Fig D
The S15 requires a 12v DC supply to operate, this lead should be connected
to the vessel’s power supply (the red wire is positive, black is negative),
keeping the cable runs as short as possible. Although the radio draws very
little current when receiving, a heavier current is drawn when transmitting
which may result in a voltage drop if very long cable runs are used of
inadequate core diameter. If the supplied power lead is not long enough, an
extension of up to 3m(10 ft) can be made using at least 2.5mm (13AWG)
wire.
The chassis of the S15 is not connected to either supply rail. This allows a
direct connection to the ship’s earth connection for voltage and RF interface
protection. The red wire is positive and black is negative. If polarity is
accidentally reversed, the set will not operate.
The antenna is connected to the S15 using a standard PL259 type connector
as fitted to most marine antennae. If fitting to an existing antenna, check that
the contacts are not corroded before connecting, as this will affect the quality
of the signal, Ensure that the retaining collar of the antenna plug is securely
tightened to prevent accidental disconnection.
14.2 Antenna Installation Recommendations
The most important factor in the performance of the S15 will be the quality
and positioning of the antenna. Most recorded problems with VHF radios are
related to poor antenna siting, faulty cabling, poor quality cable joints and low
voltage supply. Even the best performing radio cannot compensate for these
factors. If replacing an existing
installation using the same antenna, it is
important that these factors are checked when installing the radio.
… 46 …


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