PT3600 Service Manual
12
Chapter 6 Adjustment
Before test/adjustment, make sure all equipment has been well
connected to the ground!
Before test/adjustment, make sure the antenna output terminal
has been correctly connected to corresponding equipment or load!
The transmitter output terminal must be terminated with an RF
power attenuator and connected to a standard signal generator
(SSG)/frequency counter/deviation meter/spectrum analyzer
！
Make sure no transmission operation is being conducted while
measuring the receiver!
During the adjustment/test/maintenance, make sure reliable
anti-static measures are taken for human body and equipment.
6.1 Equipment and Software Required for Service
Equipment and software listed in Table 6.1 are required for
test and service of PT3600.
Table 6.1 Equipment and Software Required for Test and Service
No.
Item
Specifications
1 Computer
P2 or above, IBM compatible PC, WINDOWS
98/ME/2000/XP Operating System
2
Programming
software
KSP3600
3
Programming
cable
KSPL-02
4 Clone
cable
KCL-01
5
DC regulated
power supply
Output voltage: 7.5V
Output current:
≥
5A
6 RF power meter
Measurement range: 0.5-10W
Frequency range: 100MHz-500MHz
Impedance: 50
Ω
SWR
≤
1.2
7 Frequency
counter
Frequency range: 0.1 - 600MHz
Frequency accuracy: better than ±1×10
-6
Sensitivity: better than 100mV
8 Deviation
meter
Frequency range: DC - 600MHz
Measurement range: 0 - ±5kHz
9 DMM
Input impedance: above 10M
Ω
/V DC, capable of
measuring voltage, current and resistance.
10
Audio signal
generator
Frequency range:2-3000Hz
Output level: 1-500mV
11
RF power
attenuator
Attenuation: 40dB or 50dB
Supporting power : higher than 10W
12
Standard signal
generator
Frequency range: 10MHz-1000MHz
Output level:
0.1uV-32mV (-127dBm~-17dBm)
13 Oscilloscope
Frequency range: DC~20MHz
Measurement range: 10mV-20V
14
Audio frequency
voltmeter
Measurement range: 10mV-10V
Recommendation: Item 6, 7, 8, 10, 11, and 12 listed in the
table can be replaced by HP8920 general test set.
6.2 Adjustment Items
During the course of maintenance, it is necessary to test the
radio and adjust its technical parameters after changing
components. The following part is going to introduce the
adjustment items.
Some parameters can be adjusted by use of KSP3600
programming software (in the Test Mode). The adjustable
parameters are as follows:
1) Middle frequency
2) Tx power
3) Battery
Steps for adjustment:
a. Enter PC Test Mode. Refer to Section 4.3.
b. Click “Tools” in the main menu of KSP3600 programming
software, and then click “Test Mode” in the pull-down menu to
enter.
c. Then the test screen will pop up. Double click the item you
want to adjust, and then you can adjust the parameters.
d. Exit the PC Test Mode after adjustment.
6.3 Adjustment
6.3.1 PLL frequency
In the Test Mode, double click “Middle Frequency” to enter.
Adjust the parameter among 0-255 to make the Tx frequency at
the rated value (error within 200Hz).
6.3.2 Tx power
In the Test Mode, double click “High Power (Low)” to enter.
Adjust the parameter among 0-255 to make the Tx power at 4W.
Meanwhile, observe the operating current, and make sure that the
current
≤
1.8A.
Use this method to adjust “High Power (Lower)”, “High
Power (Mid)”, “High power (Higher)”, “High Power (High)”, and
make the Tx power at 4W.
6.3.3 Tx low battery voltage warning
Set the voltage of the power supply at 6.8V.
In the Test Mode, double click “Battery” to enter. Adjust the
parameter among 0-255 to make the red LED flash.
6.4 Adjustment Description
See Table 6.2.
Table 6.2 Transmitter Section
Item
Test condition
Test equipment
Measuring
terminal
Adjustment
parts
Requirement
Remark
