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1. PA Switch - Select the Public Address
mode when an external PA speaker is
connected. When the PA mode is
selected, the CB radio will be disabled.
Adjust the PA output level by rotating
the volume control.
2. ANL Switch - You can select the
Automatic Noise Limiter to help reduce
harsh background noise caused by a
variety of interference sources.
3. Instant CH 9 Switch - Use this switch
to override the main channel selector
and instantly tune to the emergency
channel 9. Switch back to return to
normal 40 channel operation.
4. TX LED - An LED lights to indicate
when the radio is transmitting.
5. S/RF Meter - This LED meter shows the
relative strength of the received signal
or the RF output.
6. Channel Indicator - Displays the
channel currently in use.
7. Channel Selector - This switch selects
the desired channel for transmission and
reception. All channels, except channel
9, may be used for communications
between stations operating under
different license. Channel 9 has been
reserved by the FCC for emergency
communications involving the
immediate safety of individuals or the
immediate protection of property.
Channel 9 also may be used to
render assistance to a motorist. This
is a FCC rule and applies to all
operators of CB radios.
8. RF Gain - This control is used to adjust
the signal reception in areas where
strong signals are present. Turn the
control clockwise for maximum
reception.
9. Squelch - The squelch control is
used to eliminate background noise
during the absence of a transmission.
Turn the control fully counterclockwise,
then slowly rotate it back clockwise until
the noise disappears. At this setting any
transmission must be slightly stronger
than the background noise to “Break
Squelch” or to be heard. Further
clockwise rotation will increase the
threshold at which a signal will be
heard.You can select any level to
“Break Squelch.”
10. Volume Control - Rotate clockwise to
turn the radio on and to increase
the volume.
11. Microphone Jack- The operational
mode of the CB is controlled by the
push-to-talk switch on the microphone.
Press the switch to activate the
transmitter and disable the receiver.
Release the switch to enable the
receiver and disable the transmitter.
When transmitting, hold the microphone
about 2 inches from your mouth and
speak clearly in a normal voice. The
microphone included with the
PRO 520
XL is detachable electret type.
Antenna Connector - This female
connector permits connection of the trans-
mission line cable male connector (PL-259)
to the transceiver.
Public Address - An external 8 ohm 7-watt
speaker must be connected to the “PA SP”
jack located on the back of the unit. The
speaker must be directed away from the
mic to prevent feedback.
External Speaker - The external speaker
jack is used for remote receiver monitoring.
The external speaker should have an 8
ohm impedance and be rated at least 7
watts. When an external speaker is
connected, the internal speaker is disabled.
CONTROLS AN
PRO520 om.qxd 11/11/99 12:52 PM Page 4