Hytera PD502, Руководство по обслуживанию, Страница: 40 / 136

VHF (136-174 MHz) Tuning Description
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5. Click the “Save” button to save your settings.
Transmit-to-Deviation
1. Connect the antenna connector of the radio with HP8921, and set
HP8921 to TX test mode.
2. Set the HP8921 parameters as follows:
IF Filter: 230 kHz
Filter1: <20 Hz HPF
Filter2: <15 kHz LPF
De-Emphasis: OFF
3. Open the Tuner software, go to “TUNE_DATA -> TX” and double click
“Transmit-to-Deviation” from the navigation tree on the left. Then click the
“Transmit On” button.
4. Observe the frequency deviation displayed on HP8921, and adjust the
vernier on Tuner until the frequency deviation is 5 k±50 Hz.
5.
Click the “Transmit Off” button.
6. Click the “Save” button to save your settings.
Modulation Balance
1. Connect the antenna connector of the radio with HP8921, and set
HP8921 to TX test mode.
2. Set the HP8921 parameters as follows:
IF Filter: 230 kHz
Filter1: <20 Hz HPF
Filter2: <15 kHz LPF
De-Emphasis: OFF
3. Open the Tuner software, go to “TUNER_DATA -> TX” and double click
“Modulation Balance” from the navigation tree on the left. Then select an
appropriate channel.
4. Click the “Transmit On” button.
5. Adjust the value in the dialog box until the frequency deviation displayed
on HP8921 is 4.93 k±50 Hz.
6. 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.