Hytera PD362, Service Manual

Page: 109 / 141

Tuning Description
Uc (430
‐
470 MHz)
34
Items Method
is input via the keyboard. If the value is adjusted via the vernier, skip this
step.
7. Click the “Transmit Off” button.
8. Click the dialog box below LOW_PORT.
9. Set AFGen1 Freq to 1.4 kHz on HP8921.
10. Click the “Transmit On” button.
11. Adjust the value in the dialog box until the frequency deviation displayed
on HP8921 is 5k±50 Hz .
12. Press the Enter key on the keyboard to confirm your settings if the value
is input via the keyboard. If the value is adjusted via the vernier, skip this
step.
13. Click the “Transmit Off” button.
14. Select another channel and repeat Step 3 to Step 13.
RX Section
Front-end Filter
1. Connect the antenna connector of the radio to HP8921.
2. Connect the Audio Out port of the radio to the Audio In port of HP8921,
and set HP8921 to RX test mode.
3. Set the HP8921 parameters as follows:
Output RF signal: -118 dBm/Frequency
Modulation frequency: 1 kHz
Modulation deviation: 3 kHz
De-Emphasis: 750 us
4. Observe the value displayed on the HP8921 and adjust the vernier until
the SINAD value is more than 18 dB .
5. Set the HP8921 parameters as follows:
Output RF signal: -35 Bm/Frequency
6. Observe the value displayed on the HP8921 and adjust the vernier until
the SINAD value is less than 10 dB .
7. Press the Enter key on the keyboard to confirm your settings if the value
is input via the keyboard. If the value is adjusted via the vernier, skip this