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AM/FM/PA 10 METER MOBILE AMATEUR TRANSCEIVER
OWNER'S MANUAL
INTRODUCTION
Congratulations on your purchase of a Magnum S-3 FM/AM 10 meter transceiver. Your Magnum S-3 is designed to
provide years of enjoyment and trouble-free service. There are many features and functions designed into this
transceiver. To ensure that your investment is enjoyed to its fullest extent please take a few moments and thoroughly read
this manual.
Your Magnum S-3 is a combination microprocessor and phase-lock loop (PLL) controlled radio combining both high RF
performance with a user-friendly front panel. The Magnum S-3 is built rugged to withstand years of use in harsh mobile
environments. Although engineered with mobile use in mind the Magnum S-3, with the addition of a high quality 10 amp
regulated power supply, may be easily adapted to fixed station operation.
IMPORTANT: The Magnum S-3 is designed for entry level amateur use. If the transmitter is operated in the United
States or within it's territories a licensed amateur radio operator must be present at the station. The minimum license
class to operate 10-meter phone is Novice/Technician. If you are studying for your license and want to familiarize yourself
with the operation of the radio, the receiver may be operated with or without a licensed operator present. For more
information regarding FCC licensing, contact your nearest amateur radio dealer, or for complete details contact the
American Radio Relay League.
American Radio Relay League (ARRL)
225 Main Street
Newington, CT 06111
Telephone 860-594-0200
Facsimile 860-594-0259
http://www.arrl.org
LIMITED WARRANTY
Magnum International warrants this product to be free of defects for a period of one (1) year from the original date of
purchase. This warranty is non-transferable. This limited warranty is subject to repair or replacement of defective
components only. This warranty is void if the radio has been tampered with or misused.
IMPORTANT: RETAIN YOUR SALES RECEIPT
The enclosed warranty registration form must be filled out and mailed along with a photocopy of your sales receipt within
15 days from the purchase date. If the warranty registration form and copy of your sales receipt are not received the radio
is not covered under warranty. Please fill out the enclosed warranty registration form and send it along with a copy of your
sales receipt to:
Magnum International
PO Box 445
Issaquah, WA 98027
Registering your S-3 with Magnum provides several benefits:
1) Validates your warranty.
2) Entitles you to free updates and information regarding your radio and new accessories for your radio.
3) Provides possible recovery of lost or stolen radios through our serial number tracking database.
INSTALLATION
1. Contents Before making any electrical connections make sure
Unpack and inspect your Magnum S-3 for missing or the volume (VOL) control is in the "OFF" position.
damaged components. Your Magnum S-3 includes Connect the positive (+) red wire of the DC power
the following items: cord to a positive 13.8-volt source at the vehicle fuse
block. If connecting to the fuse block, it is
Quantity Description recommended that a switched power source be
1 Magnum S-3 Transceiver used so that the power to the transceiver is
1 Microphone disconnected when the vehicle is off. This will
1 DC Power Cord with Inline Fuse eliminate the possibility of the transceiver draining
1 Mounting Bracket with Hardware the vehicle's battery.
1 Microphone Hanger with Hardware Set
1 Operating Manual with Schematic/PLO Connect the negative (-) black wire to a metal part of
1 Warranty Registration Form the vehicle's frame, or chassis ground. Make sure
that this is a good ground connection.
2. Microphone Hanger
The microphone hanger may be attached to the side The Magnum S-3 power cord may also be
of the transceiver, or any other convenient location. connected directly to the battery. Connecting directly
Locate the mounting holes on either side of the to the battery has several benefits, the first of which
transceiver. Use the provided screws to attach the is to maximize RF output. Secondly, the battery is a
microphone hanger either vertically or horizontally to very large capacitor and will help eliminate certain
the side of the transceiver. types of ambient and vehicle noise. If connecting
directly to the vehicle's battery, additional power
3. Mounting cable may be required. On runs of 8 feet or less use
When attaching the Magnum S-3 mounting bracket 14-gauge stranded wire. Use 12-gauge wire on
to the vehicle, choose a location that will provide longer runs.
easy access to all front panel controls and air
circulation to the rear panel. When selecting a 5. Antenna Connection
mounting location, make sure that there is ample The transceiver will operate using any standard 50-
space behind the control deck for the cables. Do not ohm ground-plane, vertical, mobile whip, long wire
pinch, or bend sharply, the power or antenna cables. or similar antenna. The antenna should be rated at
Do not install the Magnum S-3 in any compartment 100 watts PEP minimum. A standard SO-239 type
that restricts airflow and do not install in a location antenna connector is located on the rear panel of
that interferes with the safe operation of the vehicle. the Magnum S-3. Connection is made using a PL-
259 and high-grade coaxial cable (RG213, RG58A/U
Attach the mounting bracket to the vehicle first then or Mini RG-8 is recommended).
mount the Magnum S-3 to the bracket. If the rear
panel is not accessible you may want to attach the A ground-plane antenna provides greater coverage
power and antenna cable prior to mounting. and is recommended for fixed station-to-mobile
operation. For point-to-point fixed station operation,
4. Electrical Connections a directional beam antenna operates at greater
The Magnum S-3 is designed to work on any 13.8 distances even under adverse conditions. A non-
volt DC, negative ground, source. The condition of a directional antenna should be used in a mobile
vehicle's electrical system can affect operation. A installation; a vertical whip is best suited for this
low battery, worn generator/alternator, or poor purpose. The base loaded whip antenna normally
voltage regulator will seriously impair the provides effective communications. For greater
performance of the transceiver. Any of the above range and more reliable operation, a full quarter
conditions could result in a high level of receiver wave whip may be used. Either of these antennas
noise generation or a substantial loss of the uses the metal vehicle body as a ground plane.
transmitter's RF output. Make sure that all of these
components of your vehicle's electrical system are in Once the antenna is mounted on the vehicle, route
good condition prior to installing the transceiver. the coaxial cable so that it is not next to any power
cables or vehicle cables. Connect the PL-259 to the
CAUTION! antenna connector on the rear panel of the Magnum
VOLTAGE EXCEEDING 15 VDC WILL S-3. Make sure that the cable does not interfere with
DAMAGE THE RADIO. MEASURE VOLTAGE the safe operation of the vehicle.
AT BATTERY TERMINALS, WITH VEHICLE
RUNNING, PRIOR TO INSTALLATION!
6. VSWR
Before use, it is important to determine the antenna
system's VSWR (voltage standing wave ratio). You
will need a high quality SWR bridge (meter) to
accurately tune your antenna system. First, make
sure the SWR bridge is in good working order and is
calibrated. To ensure your radio is performing
properly the VSWR should never exceed 1.5 to 1.
Never transmit on any antenna system where the
VSWR exceeds 1.8 to 1. This will stress the output
stage and could destroy the RF transistors; this type
of misuse and failure is not covered under warranty.
Measure the VSWR at the center of the operating
band. Tune the antenna (according to the antenna
manufacturer's tuning instructions) so that the
VSWR is as close to 1 to 1 at the center of the
operating band.
Next, measure the VSWR at the lowest and highest
frequency of the transceiver. If the antenna has a
wide enough frequency range and band-pass, the
VSWR readings should be below 1.5 to 1 across the
entire operating band. If at the lower or upper end of
the transceiver operating frequency, the VSWR
measures more than 1.5 to 1, it is recommended
that the antenna be re-tuned before operating on
those frequencies.
If you are experiencing unusual VSWR readings
check for the following possible problems:
1) Make sure that the antenna is installed properly
and grounded.
2) Check all coaxial cable and connectors for
defects and poor routing.
3) If testing a vehicle installation, make sure that all
vehicle doors are closed when testing.
4) Do not test near or around large metal objects or
buildings.
7. Ignition Noise
In certain vehicle installations, electrical noise or
interference may be present in the receive audio of
the transceiver. Typically the vehicle's ignition
system or more specifically the alternator generates
this noise. The Magnum S-3 is equipped with both
ANL and noise blanker circuits that are designed to
improve, and in many instances eliminate, electrical
noises.
In extreme cases, the noise blanker may not
eliminate all electrical noises. In such cases, an
inline DC noise filter can be used. The PLF-10C
FilterCord by Magnum International is designed for
use with the Magnum S-3 and is an effective way to
eliminate all noise emanating from the 12VDC line.
The filter will not have any effect on airborne noise
entering the radio through the antenna system. This
includes the `popping' sound associated with ignition
systems.
FRONT PANEL CONTROLS
1. MICROPHONE INPUT 4. BAND
A 4 pin, screw ring microphone connector is used. Use to select the following band segments
Microphone wiring is as follows: (frequency groups).
Pin 1: Ground (Gnd)
Pin 2: Microphone Audio (AF) Band Frequency Range
Pin 3: Transmit (TX) A 28.015 - 28.455 MHz
Pin 4: Receive (RX) B 28.145 - 28.585 MHz
C 28.115 - 28.555 MHz
2. (OFF) VOL SQL D 28.085 - 28.525 MHz
E 28.055 - 28.495 MHz
(OFF): Turns the radio on and off. Rotate the control F 28.025 - 28.465 MHz
counterclockwise until it clicks.
5. TURBOTM ECHO VOL DEL
VOL: Volume. Adjusts the AF gain, or volume of the TURBOTM Digital Echo is a Magnum radio exclusive
receive audio. Turn clockwise to increase and feature. The TURBOTM Digital Echo is louder, has a
counterclockwise to decrease. wider range, and a more natural sound than any
other echo processor available.
SQ: Squelch. Used to eliminate background or
"white" noise when monitoring strong signals. To VOL: Echo Volume. Varies the volume or number of
properly adjust the squelch circuit, start rotating the echo repetitions. To increase the echo volume,
control slowly clockwise until the received white rotate the control clockwise.
noise disappears.
DEL: Echo Delay. Varies the amount of delay, or
3. MIC-G RF-G duration of the echo repetition. Rotate clockwise to
increase the amount of delay and counterclockwise
MIC-G: Microphone Gain. Increases or decreases to decrease.
the microphone audio output, or "talk power". The
gain increases as the control is rotated clockwise. 6. PWR AMT
RF-G: RF Gain. Adjusts the receiver sensitivity to PWR: Variable RF Output Power. The transmitted
both signals and background noise. This affects the power of the Magnum S-3 may be varied from 1 to
distance at which a signal can be detected. Turning 50 watts peak. Rotate clockwise to increase RF
the control counterclockwise reduces the receiver output power. Rotate counterclockwise to decrease
sensitivity. This is particularly useful in areas where RF output power.
large volumes of signals are present. The S/RF
display ("SIG" bar) indicates the received signal's Variable RF output power allows low power
strength. transmitting for QRP operation in compliance with
the FCC request for reduced signal strength during
periods when propagation levels are high.
AMT: All Mode Talk Back. AMT, a Magnum NOTE: The noise blanker is effective in eliminating
exclusive, is an independent talk back monitor. The pulse type interference usually associated with
AMT functions in all modes and allows the operator automotive ignition systems.
to monitor the transmitted audio of the Magnum S-3.
To increase the volume of the talk back rotate the 12. +10kHz - OFF: In the +10kHz position, the
control clockwise. To decrease rotate frequency is shifted up 10 kHz.
counterclockwise. To turn off the talk back rotate the
control completely counterclockwise. 13. RX/TX/SWR: Receive, Transmit and High SWR
Warning Indicator LED. A two color LED that is
7. FREQUENCY: Rotate clockwise or counterclockwise green while the receiver is active and red while the
to select the desired frequency. transmitter is active.
8. S/RF METER: Indicates receive signal strength and SWR warning light illuminates when the antenna's
RF output power. The top bar on the meter indicates standing wave ratio is over the recommended ratio -
RF output power. The bottom bar indicates receive 2 to 1.
signal strength.
14. Channel Display: Two digit "channelized" frequency
9. AM - FM - PA: Selects the mode of operation - AM, display. See frequency chart for cross-reference of
FM or PA (public address). channel.
PA: Public Address. The PA feature allows the radio 15. Microphone Push-To-Talk Switch: Press and hold
operator to use the Magnum S-3 as a public address the switch to transmit. While transmitting, speak into
amplifier. The PA feature requires the use of an 8- the front grill of the microphone.
ohm, 4 watt public address speaker or horn. PA
horns may be purchased from most electronic or The RX / TX LED indicator will turn from green to
automotive shops. The horn is connected to the PA red. Release the switch to receive.
jack on the rear panel of the Magnum S-3.
To operate the PA feature, switch the Magnum S-3 REAR PANEL
to the PA mode, depress the PTT and speak in a 1. EXT. SP.: External Speaker Jack
normal voice into the microphone - just as though An external speaker jack is located on the rear panel
you are transmitting. Your audio will be sent to the of the transceiver. The Magnum S-3 is designed to
PA horn and not transmitted over the air. accept any standard 8-ohm external speaker for use
with two-way transceivers.
10. TOP GUN MODULATOR - OFF: Modulator on/off
switch. To activate the Top Gun modulator circuit 2. PA: Public Address Speaker Jack
move the switch to the up position. To bypass the A public address horn (speaker) jack is located on
modulator circuit move the switch to the OFF the rear panel of the transceiver. Plug the PA horn
position. into the back panel and follow the instructions
included with the product.
The modulator circuit, created by TOP GUN
TECHNOLOGIES (www.TopGunTec.com), is a 3. DC Power Connection
Magnum radio exclusive. Activating the modulator The Magnum S-3 uses the standard 3-pin DC power
allows the radio operator to set the AM power output connector.
level to as little as 1 watt carrier and still modulate
(swing) to 50 watts