Hytera MD78X, Руководство по обслуживанию

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Tuning Description
VHF (136MHz
–
174MHz)
48
Items Method
select an appropriate channel.
3. Click the “Transmit On” button on Tuner.
4. Adjust the power to the required level as follows:
Low power: 1 W for version C, and 5 W for version D and the later
Medium power: 25 W
High power: 50 W for radio with power of 50 W, and 25 W for
radio with power of 25 W
5. Click the “Save” button on Tuner to save the existing value to the
radio.
Transmit-to-Deviation
1. Connect the radio to HP8921 via the antenna connector, and set
HP8921 to TX test mode.
2. Set HP8921 as follows:
IF Filter: 230 kHz
Filter1: <20 Hz HPF
Filter2: <15 kHz LPF
De-Emphasis: off
3. Open the Tuner software and go to “TUNE_DATA -> TX ->
Transmit-to-Deviation” in the left navigation tree. Then click the
“Transmit On” button. Then set the modulation signal of HP8921
to “100 Hz”.
4. Adjust the vernier on Tuner until the frequency deviation
displayed on HP8921 is “5 kHz”.
5. Click the “Save” button on Tuner to save the existing value to the
radio.
6. Click the “Transmit Off” button on Tuner.
Modulation Balance
Here takes the low frequency
deviation
for example.
1. Connect the radio to HP8921 via the antenna connector, and set
HP8921 to TX test mode.
2. Set the HP8921 parameters as follows:
IF Filter: 230 kHz