Hytera PD502, Руководство по обслуживанию, Страница: 39 / 136

VHF (136-174 MHz) Tuning Description
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8. Tuning Description
8.1
Required Test Instruments

Radio test sets: Aeroflex 3920 and HP8921

3A/10V power supply

Multimeter

Tuner software
8.2
Tuning Procedures
8.2.1
Tuning a Radio
After the radio is reassembled, it must be tuned via the Tuner software.
The specific operations are described in the table below.
Items Method
TX Section
Reference Oscillator
Warp
1. Connect the antenna connector of the radio with HP8921, and set
HP8921 to TX test mode.
2. Open the Tuner software, go to “TUNE_DATA -> TX” and double click
“Reference Oscillator Warp” from the navigation tree on the left. Then
click the “Transmit On” button.
3. Observe the frequency displayed on HP8921, and adjust the vernier on
Tuner until the frequency offset is less than or equals to 40 Hz.
4. Click the “Transmit Off” button.
5. Click the “Save” button to save your settings.
Transmit Power
Calibration
1. Connect the antenna connector of the radio with HP8921, and set
HP8921 to TX test mode.
2. Open the Tuner software, go to “TUNE_DATA -> TX” and double click
“Transmit Power Calibration” from the navigation tree on the left. Then
select an appropriate channel.
3. Click the “Transmit On” button.
4. Adjust the power to the required level as described below:
L
：
1.2
±
0.1 W
H
：
4.7
±
0.1 W