FRONT PANEL CONTROLS
1. MICROPHONE
INPUT
A 4 pin, screw ring microphone connector is used.
Microphone wiring is as follows:
Pin 1: Ground (Gnd)
Pin 2: Microphone Audio (AF)
Pin 3: Transmit (TX)
Pin 4: Receive (RX)
2.
(OFF)
VOL SQL
(OFF)
: Turns the radio on and off. Rotate the control
counterclockwise until it clicks.
VOL
: Volume. Adjusts the AF gain, or volume of the
receive audio. Turn clockwise to increase and
counterclockwise to decrease.
SQ
: Squelch. Used to eliminate background or
“white” noise when monitoring strong signals. To
properly adjust the squelch circuit, start rotating the
control slowly clockwise until the received white
noise disappears.
3. MIC-G RF-G
MIC-G
: Microphone Gain. Increases or decreases
the microphone audio output, or “talk power”. The
gain increases as the control is rotated clockwise.
RF-G
: RF Gain. Adjusts the receiver sensitivity to
both signals and background noise. This affects the
distance at which a signal can be detected. Turning
the control counterclockwise reduces the receiver
sensitivity. This is particularly useful in areas where
large volumes of signals are present. The S/RF
display (“SIG” bar) indicates the received signal’s
strength.
4. BAND
Use to select the following band segments
(frequency groups).
Band
Frequency Range
A
28.015 - 28.455 MHz
B
28.145 - 28.585 MHz
C
28.115 - 28.555 MHz
D
28.085 - 28.525 MHz
E
28.055 - 28.495 MHz
F
28.025 - 28.465 MHz
5. TURBO
TM
ECHO VOL DEL
TURBO
TM
Digital Echo is a Magnum radio exclusive
feature. The
TURBO
TM
Digital Echo is louder, has a
wider range, and a more natural sound than any
other echo processor available.
VOL
: Echo Volume. Varies the volume or number of
echo repetitions. To increase the echo volume,
rotate the control clockwise.
DEL
: Echo Delay. Varies the amount of delay, or
duration of the echo repetition. Rotate clockwise to
increase the amount of delay and counterclockwise
to decrease.
6. PWR AMT
PWR
: Variable RF Output Power. The transmitted
power of the Magnum S-3 may be varied from 1 to
50 watts peak. Rotate clockwise to increase RF
output power. Rotate counterclockwise to decrease
RF output power.
Variable RF output power allows low power
transmitting for QRP operation in compliance with
the FCC request for reduced signal strength during
periods when propagation levels are high.
