3

TK-480/481
OPERATING FEATURES

1.Operation Features

The TK-480/481 is an 800/900MHz band EFJ LTR™-com-
patible trunked radio designed to operate in both trunked
and conventional modes. The programmable features are
summarized.
Model Trunking mode
Conventional mode
This model can handle up to 32 systems with up to 250
groups in each system. The transceiver can be used in both
trunked mode and conventional mode. Systems, groups,
and their functions are programmed.

2. Transceiver Controls and Indicators

2-1. Physical Layout

5
4
1 2 3
Microphone Speaker
6
10
11
12
9
7
8
Note : The transceiver is also available without the DTMF
keypad ( ).

2-2. Panel controls

The key on the top and front panel is momentary-type
push buttons. The functions of these keys and knob are ex-
plained below.

Antenna connector

Connect the supplied antenna here.

System or Group selector knob (Programmable)

Turning the system (or group) selector knob clockwise
increases the system (or group) number by one. Turning
the knob in the counterclockwise direction decreases the
system (or group) number by one.
After the system number (or group number) reaches the
highest system number (or group number), it goes back
to lowest system number (or group number).
System numbers (or group numbers) not set are skipped.
Caution : The FPU (KPG-49D) allows selecting between
system selector and group selector.

Volume/Power switch

Transceiver Power and Volume switch. Turn clockwise to
switch On the transceiver. Turn counterclockwise fully to
switch OFF the transceiver. Also adjusts the volume
level. When the power is switched off, all the param-
eters, such as the system and group, are stored in
memory. When the power is switched on again, the sys-
tem returns to the previous conditions.

Auxiliary (orange) key (Programmable)

Battery pack release catch

Push down to release the battery pack. See Installing the
Ni-Cd Battery Pack.

MONITOR key* (Programmable)

PTT (Push-To-Talk) key

Press this key, then speak into the microphone to call a
station.

LAMP key* (Programmable)

TX/BATT indicator

This red LED lights during transmission (it does not light
during busy or when transmit is prohibited). If the battery
voltage falls below the programmed voltage during trans-
mission, the brightness of this indicator decreases at in-
tervals of about one second, so it can be used as the bat-
tery voltage alert function.

S, A, B, and C key (Programmable)

DTMF keypad (keypad model only)

Press the keys on the telephone keypad to send DTMF
tones.

Universal connector

Connect the external KMC-25 speaker/ microphone (op-
tional) here. Otherwise, keep the supplied cover in place.
* : MONITOR and LAMP are arbitrary names chosen for
these buttons. They can be used for any of the auxiliary
functions.

2-3. Programmable keys

The FPU (KPG-49D) enables programmable keys to se-
lect the following functions.
Auto Tel, AUX(only when Voice Scrambler is not se-
lected), DTMF ID (BOT), DTMF ID (EOT), Display Character,
Emergency (only AUX key), Function, Group Down, Group
Up, Home Group, Key Lock, Lamp, Memory (RCL/STO),
Memory (RCL), Memory (STO), Monitor A, Monitor B, Moni-
tor C, Monitor D, Redial, RF Power Lo, Scan, Scan Del/Add,
Scan Temporary Delete, Scrambler (Only when Voice
Scrambler is selected), SP Attenuation (Only MIC switch),
System Down, System Up, TEL Disconnect and none.
These functions the FPU programs to the function keys
are described in the following sections.