Galaxy DX 979, Service Manual

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20
MOD
S
3
1
SWR
PWR 0
DX 979
+20
12
80
dB +40
100%
+60
3
6
7
5
40
9
60
2
1
1.5
3
1
18
MA
X
OFF
TALKBACK
DIM PWR MIC RF
OFF
VOL SQ
USB
AM
LSB
CLARIFIER
NB/ANL
PA
CB MOD
SWR
PWR
RX/TX
SWR
8
12
9
10 11 14 13 18 15
1 2 3 5 4 7 6
16 17
DX 979 CHAPTER 2
OPERATION
Figure 2-1 Front Panel
2.0 INTRODUCTION
This section explains the basic operating procedures for the DX 979 mobile CB radio.
2.1 CONTROLS AND CONNECTIONS
2.1.1 FRONT PANEL
Refer to the above Figure 2-1 for the location of the following controls.
1. MICROPHONE JACK: Used to connect microphone for voice source.
2. SQUELCH CONTROL: This knob is used to eliminate background noise being heard through the
receiver, which can be disturbing when no transmissions are being heard through the receiver. To
use this feature, turn the knob fully counterclockwise and then turn clockwise slowly until the
background noise is just eliminated. Further clockwise rotation will increase the threshold level
which a signal must overcome in order to be heard. Only strong signals will be heard at a maximum
clockwise setting.
3. ON/OFF VOLUME CONTROL: This knob controls the volume and power to the radio. To turn
radio on, rotate the knob clockwise. Turning the knob further will increase the volume of the
receiver.
4. RF GAIN CONTROL: This control is used to reduce the gain of the RF (receive) amplifier under
strong signal conditions.