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INSTALLATION
1. Contents
Unpack and inspect your Magnum S-9 for missing or
damaged components. Your Magnum S-9 includes the
following items:
Quantity
Description
1 Magnum S-9 Transceiver
1 Dynamic Microphone
1 DC Power Cord with Inline Fuse
1 Mounting Bracket with Hardware
1 Microphone Hanger with Hardware Set
1 Operating Manual with Schematic
1 Warranty Registration Form
2. Microphone Hanger
The microphone hanger may be attached to the side of
the transceiver, or any other convenient location. Lo-
cate the mounting holes on the side of the transceiver.
Use the provided screws to attach the microphone hanger
either vertically or horizontally to the side of the trans-
ceiver.
3. Mounting
When attaching the Magnum S-9 mounting bracket to
the vehicle, choose a location that will provide easy ac-
cess to all front panel controls and air circulation to the
rear panel. When selecting a mounting location, make
sure that there is ample space behind the unit for the
cables. Do not pinch, or bend sharply, the power or
antenna cables. Do not install the Magnum S-9 in any
compartment that restricts airflow and do not install in a
location that interferes with the safe operation of the
vehicle.
Attach the mounting bracket to the vehicle first then
mount the Magnum S-9 to the bracket. If the rear panel
is not accessible you may want to attach the power
and antenna cable prior to mounting.
4. Electrical Connections
The Magnum S-9 is designed to work on any 12 - 14.1
volt DC, negative ground, source. The condition of a
vehicle’s electrical system can affect operation. A low
battery, worn generator/alternator, or poor voltage regu-
lator will seriously impair the performance of the trans-
ceiver. Any of the above conditions could result in a high
level of receiver noise generation or a substantial loss of
the transmitter’s RF output. Make sure that all of these
components of your vehicle’s electrical system are in
good condition prior to installing the transceiver.
CAUTION!
VOLTAGE EXCEEDING 15 VDC WILL DAMAGE
THE RADIO. MEASURE VOLTAGE AT BATTERY
TERMINALS, WITH VEHICLE RUNNING, PRIOR
TO INSTALLATION!
Before making any electrical connections make sure
the volume (VOL) control is in the “OFF" position. Con-
nect the positive (+) red wire of the DC power cord to a
positive 13.8 volt source at the vehicle fuse block. If
connecting to the fuse block, it is recommended that a
switched power source is used so that the power to the
transceiver is disconnected when the vehicle is off. This
will eliminate the possibility of the transceiver draining
the vehicle’s battery.
Connect the negative (-) black wire to a metal part of the
vehicle’s frame, or chassis ground. Make sure that this
is a good ground connection.
The Magnum S-9 power cord may also be connected
directly to the battery. Connecting directly to the bat-
tery has several benefits, the first of which is to maxi-
mize RF output. Secondly, the battery is a very large
capacitor and will help eliminate certain types of ambi-
ent and vehicle noise. If connecting directly to the
vehicle’s battery, additional power cable may be required.
On runs of 8 feet or less use 14-gauge stranded wire.
Use 12-gauge wire on longer runs.
5. Antenna Connection
The transceiver will operate using any standard 50-ohm
ground-plane, vertical, mobile whip, long wire or similar
antenna. The antenna should be rated at 50 watts PEP
minimum. A standard SO-239 type antenna connector
is located on the rear panel of the Magnum S-9. Con-
nection is made using a PL-259 and high-grade coaxial
cable (RG213, RG58A/U or Mini RG-8 is recommended).
A ground-plane antenna provides greater coverage and
is recommended for fixed station-to-mobile operation.
For point-to-point fixed station operation, a directional
beam antenna operates at greater distances even un-
der adverse conditions. A non-directional antenna should
be used in a mobile installation; a vertical whip is best
suited for this purpose. The base loaded whip antenna
normally provides effective communications. For greater
range and more reliable operation, a full quarter wave
whip may be used. Either of these antennas uses the
metal vehicle body as a ground plane.
Once the antenna is mounted on the vehicle, route the
coaxial cable so that it is not next to any power cables
or vehicle cables. Connect the PL-259 to the antenna
connector on the rear panel of the Magnum S-9. Make
sure that the cable does not interfere with the safe op-
eration of the vehicle.
