13
Chapter 6 Radio Debugging
Before test/debugging, make sure all the equipments have been
well connected to the ground.
Before test/debugging, make sure the antenna output terminal has
been connected properly to the corresponding devices and load.
The transmitter output must pass RF power attenuator before being
connected to the standard signal source/ frequency deviator/
frequency spectrum.
When testing the receiver, make sure not to conduct transmitting
operation.
When in debugging/testing/service, make sure static free measures
for human body and equipments.
6.1 Service Equipment and Software.
The following equipments and software in Table 6.1 are necessary
for the service and test of the radio.
Table 6.1 For Test and Service
：
Equipment and Software
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Item
Computer
Programming
Software
Programming Line
Cloning Line
DC Regulated
Power
RF power meter
Frequency Meter
Frequency
Deviator
Digital Multimeter
Audio Signal
Generator
RF power
Attenuator
Standard signal
source
Oscillograph
Audio voltmeter
Specifications
Higher than P2, compatible with IBM PC
，
WINDOWS 98/ME/2000/XP
KSP-5200
KSPL02
KCL01
Output voltage
：
7.5V, Output current
：≥
5A
Test range
：
0.5---10W
Frequency range
：
100MHz500MHz
Impedance
：
50
Ω
SWR
≤
1.2
Frequency range
：
0.1600MHz
-6
Frequency precision: Higher than
±
1
×
10
Sensitivity
：
Higher than 100mV
Frequency range
：
DC600MHz
Test range
：
0--
±
5kHz
Input impedance
：
Higher than 10M
Ω
/V DC
，
with
the ability of testing voltage, current, impedance.
Frequency range
：
2---3000Hz
Output level
：
1---500mV
Attenuation
：
40dB or 50dB
Supporting power
：
Bigger than 10W
Frequency range
：
10MHz---1000MHz
Output level
：
0.1uV~32mV (-127dBm~-17dBm)
Frequency range
：
DC~20MHz
Test range
：
10mV~20V
Test range
：
10mV~10V
The equipments in item 6, 7, 8, 10, 11, and 12 can be replaced by a
comprehensive test instrument.
MIC JACK
SPEAKER JACK
PTT/RXD
MIC
5MS
GND
TXD
SP
Figure 6.1 External Speaker/Mic Connector Definition
6.2 Debugging Items
During the course of maintenance, the radio needs to be tested and
debugged after replacing components. Some certain radio
parameters can be modified (computer mode) with our KSP 5200
programming software. The modifiable parameters are as follows:
1)
Frequency difference
2)
TX power
3)
Low battery power warning threshold
4)
Squelch level
5)
CTCSS (QT) frequency deviation
6)
DCS (DQT) frequency deviation
7)
TX frequency deviation
8)
DTMF frequency deviation
9)
TONE frequency deviation
10)
RX sensitivity
11)
RX AF power
Debugging Procedures
a.
Enter the computer test mode. Access method refers to the
instruction in 4.2.1 parameter setting.
b.
Select the
“
Test Mode
”
option is KSP5200 program to
enter the computer test mode.
c.
Select the options that you want to adjust and adjust the
parameters on the computer.
d.
After adjustment, exit the computer test mode.
6.3 Debugging
6.3.1 TX Low Power Warning
Adjust the voltage to 6.6V.
In
“
Test Mode
”
press
“↓”
to select
“
TX lower power
”
and
press Enter key.
6.3.2 VCO Modification
Turn off the power saving mode. Set the RX frequency at the low
frequency (see Table 6.2). In receiving status, test the PD power
with the digital multimeter. Adjust the trimming capacitor TC302 to
make the PD power at 1V
±
0.1V. Set the RX frequency at the high
frequency, and PD power is 3.5V
±
0.1V.
Set the TX frequency at low frequency (see Table 6.2), press the
PTT button, test the PD power with the digital multimeter. Adjust the
trimming capacitor TC301 to make the PD power at 1V
±
0.1V. Set
the TX frequency at the high frequency, and PD power is 3.5V
±
0.1V.
Table 6.2 Radio H/I/L Frequency
Low Frequency
Medium Frequency
High Frequency
TX
420.165MHz
445.165MHz
469.965MHz
RX
420.165MHz
445.165MHz
469.965MHz
6.3.3 PLL Frequency Adjustment
Under the computer test mode, press
“ ”
on the keyboard to
enter
“
Low Power (Low)
”
and press Enter. Adjust VR1 to make
the TX frequency error at +/-200HZ.
6.3.4 TX Frequency Adjustment
Under the computer test mode, press
“↓”
on the keyboard to
enter
“
Low Power (Low)
”
and press Enter. Press
“←
/
→”
key to
make the TX power at 0.5+/-0.1w and then press Enter to store the
setting. Use the same way to adjust
“
Low Power (Medium), Low
Power (Medium High), Low Power (High)
”
at 0.5+/-0.1w.
↓
PT5200 SERVICE MANUAL
