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CONTROLS
DFUNCTIONS
,. ANL Switch - You can select the
Automatic Noise limiter to help re-
duce harsh background noise caused
by a variety of interference sources.
2. 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.
3. TX LED - An LED lights to indicate
when the radio is transmitting.
4. Microphone
- The operational
mode of the CB is controlled by the
push-to-talk switch on the mic. Press
the switch to activate the transmitter
and disable the receiver. Release the
switch to enable the receiver and dis-
able the transmitter. Wh~n transmit-
ting, hold the mic about 2 inches from
your mouth and speak clearly in a
normal voice. The mic included with
the PRO 520e is a detachable
ele-
ctret type.
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 trans-
mission 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
D.OC. for emergency communications
involving the immediate safety of in-
dividuals or the immediate protection
of property. Channel 9 also may be
used to render assistance to a motor-
ist. This is aD. O.C.rule and applies to
all operators of CB radios.
8. RF Gain - This control is used to ad-
just signal reception in areas where
strong signals are present. Turn the
control fully 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 counter clock-
wise, then slowly rotate it back, clock-
wise until all 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 sig-
nal will be heard. You can select any
level to "Break Squelch".
'0. Volume Control - Rotate clockwise
to turn radio on and to increase
volume.
, ,. PA Switch - Select the PublicAd-
dress 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.
Antenna
Connector
- This female con-
nector 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
I
have an 8 ohm impedance and be rated at
least 7 watts. When.;tn external speaker is
connected,
the inre,[nal
speaker
is
disabled.
OPERATION
,""
Operating Procedure to Receive
I
,. Be sure that the power source, antenna
and
microphone
are
properly
I
connected.
I 2. Turn the unit on by rotating the volume
control clockwise.
3. Set the channel selector switch to the
desired channel.
I
4. Set the volume control to a comfortable
listening level.
5. listen to the background noise from
the speaker. Turn the squelch control
clockwise until the noise disappears (no
signal should be present). Leave the
control at this setting. The squelch is
now properly set. The receiver will re-
main quiet until a signal is actually
received. Do not advance the control
too far, or some weaker signals will not
be heard.
: Operating
Procedure
to D'ansmit
1. Be sure the operator has read and un-
derstands
D. O. C. rules and regulations
prior to operating the transmitter.
2. Select
the
desired
channel
for
transmission.
3. Ifthe channel is clear, depress the push-
to-talk svlitch on the side of the micro-
phone and speak in a normal voice.
CAUTION:
The transceiver
Voltage
Standing Wave Ratio (VS.W.R.)measure-
ment must be performed prior to the use
of the transmitter. A "VS.WR." ratio in ex-
cess of 2:' may damage the transmitter.
Please check your SWRreading frequently
by using an SWR meter.
Preventative
Maintenance
At six to twelve month intervals, the fol-
lowing system checks should be made:
,. Check the Voltage Standing Wave
Ratio (VS.WR.)
2. Inspect all electrical connections.
3. Inspect antenna coaxial cable for wear.
4. Inspect all screws and other mounting
hardware.
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