Hytera MD652, Service Manual

Page: 152 / 207

Tuning Description
VHF1 (136
‐
174 MHz)
44
Items Method
Mandown Calibration
14. Keep the radio in a vertical position.
15. Open the Tuner software, go to “TUNE_DATA -> RX -> Mandown
Calibration” in the navigation tree on the left.
16. Click the “Read” button to read the calibration data.
17. Click the “Save” button to save the calibration data.
8.2.2
Testing a radio
After tuning all the items of the radio, you need to test the digital RF signal.
Transmitting
Step 1 Open the Tuner software and go to “TEST -> TX -> Transmit BER (0.153)”.
Step 2 Select the frequency to be tested.
Step 3 Click the “Transmit On” button.
Step 4 Set the Aeroflex 3920 parameters as follows:

Freq: Be consistent with the frequency to be tested.

STD IB 511(.153)
Step 5 View all the tested items on the Aeroflex 3920 and make sure they satisfy the following
requirements.

Frequency Error ≤ 100 Hz

Transmit Power: 4.4 to 5W

FSK Error ≤ 5%

Magnitude Error ≤ 1%
Receiving
Step 1 Open the Tuner software and go to “TEST -> RX -> Receiver BER (0.153)”.
Step 2 Select the frequency to be tested.
Step 3 Set the Aeroflex 3920 parameters as follows:

Freq: Be consistent with the frequency to be tested.

STD IB 511(.153)