Chapter 2 Radio Overview; Chapter 3 Circuit Introduction - Kirisun PT8000 Service Manual

At last, ring the remained conductor and fix it.
Note: Please maintain the sufficient relaxation of the power cable to
make it convenient to dismantle the radio in the state of power
connection.
4.4 Radio Installing
Warning: For passengers' safety, please fix the radio firmly on the fixed
bracket so that the radio will not be loosened in case of collision.
The fixed bracket is taken as an example. Draw the position and drill a
hole on the instrument panel first, and then install the fixed bracket with
4 M5*16 self-tapping screws. (Note: please fix the radio at the position
convenient for operation and control, and leave an enough space for fixation
and connection of the cable.)
Slide the radio into the fixed bracket and fix it with 4 M4*10 combination
screws (plus plain washer and spring washer). (Different combinations of
fixing holes are selectable to adjust the radio to the proper height and visual
angle.)
Connect the antenna and the power cable to the radio.
Install the microphone hanger at the position easy to use, with 2 M4*16
self-tapping screws. (The microphone and its cable should be fixed at the
position not affecting safe driving.)
Connect the microphone to the microphone jack on the front panel of the
radio and put it on the hanger.
Note: When replacing the protective tube for the power cable, please
use the one of the same specification without fail. It is not allowed to
change it into the tube of higher capacity.
4.5 If you do not intend to use the external speaker, fit the supplied
speaker-jack cap to stop dust and sand getting in.

Chapter 2 Radio Overview

2.1 Description of External View
power button
Press this button for a
long time (more than
1.5 seconds) to switch
the radio on/off.
LED indicator
The red indicator will light
while transmitting; the green
indicator will light when it receives the carrier.
/ button (programmable button)
Display screen
For details, see Display .
Volume Control knob
To be used to adjust volume.
Microphone/Programming Interface
P1button (programmable button)
P2 button (programmable button)
P3button (programmable button)
PTT button (on the hand microphone)
Press the PTT button first, and then speak to the
microphone to transmit the voice to the other. Loosen to receive.
2.2 Display Screen
8
A
P1 P2 P3
B
C
D
8
PT8000 SERVICE MANUAL
Display Description
SCAN indicator Scan indication: on when scan is enabled.
LOW indicator Power level indication: on when in low power.
8. Indicates the current channel in normal use, ranging
from 1~8.
Indicates the current squelch level when squelch
selection is enabled
Displays b
Displays -
Displays u
Displays h
Displays P
Programming Mode.
Displays t
Mode.
Displays C when the radio enters the Wired Clone
Mode
2.3 Rear Panel
Antenna Interface
Power Interface
External Speaker Interface
1
Chapter 3 Circuit Principles
3.1 Frequency Structure
ANT
ANT SW RF AMP
RX
TX
PA AMP TX AMP
Figure 3.1 Frequency Chart
The receiver adopts quadric mixing mode. The first IF is 49.95MHz, and
the second IF is 450kHz.
The first local oscillation signal of the receiver is produced by frequency
synthesizer and the second local oscillation signal is produced by X1 THG.
The signal of transmitter is produced by frequency synthesizer.
The reference frequency of frequency synthesizer is produced by TCXO.
3.2 Principles of Receiver RX
1
Figure 3.2 Schematic Diagram for Receiver
ranging from 0.~9.
when Public Address is enabled.
when the radio has no channel.
when the radio is in the remote stun status.
when the radio is in the remote kill status.
when the radio enters the PC
when the radio enters the PC Adjustment
2
CF2
450KHz F
CF1
450KHz H
MCF
49.95MHz AF AMP
IF S YS TE M
TCXO
X3 mul t i pl y
16.8MHz
PLL VCO MIC AMP
2
3
Title
S i z e Number
A4
Date: 2008-9-1
Fi l e: X:\PT8000\ ..\ Frequenc
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