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LBI-38861C
ON/OFF/VOLUME
Located on the control panel,
used to turn the radio on or off
and to adjust the listening
level.
CHANNEL SELECTOR
Rotary switch, used to select
SWITCH
one of up to 10 prepro-
grammed channels
HI-LO POWER BUTTON
Selects either 1 or 5 watts RF
power output.
MONITOR BUTTON
When pressed, it unsquelches
the receiver to allow the user
to monitor the selected chan-
nel.
PTT BAR
Pressing the PTT bar keys the
transmitter and activates the
radio Channel Guard en-
coder.
BATTERY
Slide on battery pack. A 600
mAh or a 1200 mAh battery
is used to power the radio.
SPEAKER
Located behind the grille
MICROPHONE
Note the location of the mi-
crophone. To transmit clear
messages, hold the micro-
phone about two inches away
from your mouth and speak in
a normal voice.
BATTERY CHARGE
Charging contacts provided
CONTACTS
for pedestal slow charger or
desktop quick charger.
INDICATORS
BUSY/TX/BT:
TX/BT: Red LED- ON when
the transmitter is keyed (Nor-
mal transmission). NOTE:
This LED dims or goes out
when the battery voltage is
low.
BUSY: Amber LED- ON
when the selected channel is
busy.
Green LED- ON when a prop-
erly encoded signal is re-
ceiv ed on the selected
channel.
4
ALERT TONES
A series of audible alert tones are sounded to indicate the
operating status of the radio.
Upon initial power-up, a quick four tone alert indicates
the self test of the microprocessor functions has been suc-
cessfully completed. Single tones are sounded when any of
the following conditions exist:
•
An attempt to transmit on a channel set for "receive
only".
•
An attempt to transmit on a channel that is already
busy (if the "Busy Channel Lockout option has been
programmed for operation).
•
Transmitting time exceeds the preprogrammed time
allowed by the "Time-Out-Timer (Dealer pro-
grammed).
NOTE
In some radios, a VCO out-of-lock indication is given
while switching between channels. The out-of-lock
indication is indicated by the top panel LED flashing
and two short beeps sounded from the speaker. This
in no way inhibits or restricts the operation of the radio
and lasts for only a very short time.
A solution to this problem is to program all unused
channels with a receive frequency. (Although the ra-
dio is only 10 channels, it is possible to program up to
16 channels into the radio. All 16 should be pro-
grammed. The programmer is capable of doing this).
OPERATION
RADIO ON/OFF
Each time the radio is powered up, an automatic self-
check is executed and, upon satisfactory completion, a quick
four tone alert is sounded.
Turn the radio ON by rotating the VOLume control fully
clockwise (to the right) until you hear a click and the "Self-
Test" alert tone.
Turn the radio OFF by rotating the VOLume control fully
counterclockwise until you hear a click and feel the switch
enter the detente position.
TO RECEIVE MESSAGES
1.
Turn the radio ON and set the Channel Selector switch
to the desired channel.
2.
Adjust the VOLume control to the desired listening
level with the ON/OFF VOLume control. Unsquelch
the radio by pressing the monitor switch on the side of
the radio. When the radio is unsquelched, adjust the
VOLume control to the desired level.
NOTE
When Channel Guard is programmed, only calls with
the radio's specified code will be heard. In normal
operation the speaker will remain quiet until the correct
Channel guard code is received. The status indicator
will glow green, the loudspeaker will open and the call
will be heard.
TO TRANSMIT A MESSAGE
WARNING
Operation of the transmitter without a proper antenna
installed may result in permanent damage to the radio.
1.
Before making a call always monitor the channel. The
status indicator glows yellow when the channel is busy.
If the status indicator glows yellow and you cannot hear
who is transmitting because they are using a different
DCS or CTCSS tone you may listen to the channel by
pressing the Monitor Button.
2.
If a message is being received, transmit only after the
incoming message has been received.
3.
Press and hold the PTT switch, the status indicator
glows red to indicate the transmitter is operating.
4.
Place the microphone 2.5 cm to 10 cm from the mouth
and speak clearly in a normal tone of voice.
5.
Release the PTT switch to listen.
6.
Turn the radio off by rotating the on/off/VOLume con-
trol fully counterclockwise.
NOTE
•
When making a call on channels programmed
for Channel Guard, only calls with that chan-
nels specific tone or code will be heard. In
normal operation the speaker will remain quiet
until the correct tone or code is received. The
status indicator will glow green, the loud-
speaker will open and the call will be heard.
•
A red transmit indicator (TX/BT BUSY) will
be on continuously while the PTT bar is
pressed, indicating the radio is transmitting.
•
If the TX/BT/BUSY indicator is dimly lit or
fades rapidly, it is an indication that the battery
should be replaced or recharged.
•
When CTCSS and DCS is programmed, only
calls with the radio's specified code will be
heard. In normal operation the speaker will
remain quiet until the correct CTCSS or DCS
code is received. The status indicator will glow
green, the loudspeaker will open and the call
will be heard.
•
When the Transmit Time Out Timer is pro-
grammed, transmission is disabled after a pre-
set period of time. An audible alert will be
heard at the end of the period.
•
When the Busy Channel lock-out function is
programmed and the system is busy, the trans-
mitter is disabled. If the PTT button is pressed,
an audible alert will sound and the yellow
status indicator will blink off and then on.
CIRCUIT ANALYSIS
The radio consists of two main printed circuit boards: an
RF board and a control board. The RF board contains the
transmitter and receiver circuits, the synthesizer, and automatic
power control. The control board contains the microcontroller
and associated digital circuits and microphone audio circuits.
TRANSMITTER
The transmitter consists of the following:
•
microphone audio circuit
•
transmitter and harmonic filter
•
automatic power control
•
frequency synthesizer.
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