HQT DH-9100 User manual

1. Tuning Description
1.1 Required Test Instruments
Radio communication test set (Aeroflex 3920 and HP8921)
18V/3A regulated DC power supply
Multimeter
Tuner software
1.2 Tuning Procedures
1.2.1 Tuning a Radio
After the radio is reassembled, it is required to use the Tuner software to tune it.
The specific operations are described in the table below:
Item Method
TX Section
Reference Oscillator
Warp
1. Connect the antenna connector of with the HP8921, and set the
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 until
the frequency offset is less than or equals to 40Hz.
4. Click the “Transmit Off” button.
5. Click the “Save” button to save your settings.
Transmit Power
Calibration
1. Connect the antenna connector of with the HP8921, and set the
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.
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Item Method
4. Adjust the power to the required level as described below:
L: (29.5-30)dBm
H :(35.50~36.02)dBm
5. Click the “Save” button to save your settings.
Transmit-to-Deviation
1. Connect the antenna connector of with the HP8921, and set the
HP8921 to TX test mode.
2. Set the HP8921 as follows:
IF Filter: 230kHz
Filter1: <20Hz HPF
Filter2: <15kHz 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 until it is 5k±50Hz.
5. Click the “Transmit Off” button.
6. Click
the “Save” button to save your settings.
Modulation Balance
1. Connect the antenna connector of with the HP8921, and set the
HP8921 to TX test mode.
2. Set the HP8921 as follows:
IF Filter: 230kHz
Filter1: <20Hz HPF
Filter2: <15kHz LPF
De-Emphasis: OFF
3. Open the Tuner software, go to “TUNE_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.
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Item Method
5. Adjust the value in the dialog box until the frequency deviation displayed
on HP8921 is 5k±50Hz.
6. Press the Enter key on the keyboard to confirm your settings.
7. Click the “Transmit Off” button.
8. Click the “Save” button to save your settings.
Transmit Oscillator
Voltage
1. Connect the antenna connector of with the HP8921, and set the
HP8921 to TX test mode.
2. Open the Tuner software, go to “TUNE_DATA -> TX” and double click
“Transmit Oscillator Voltage” from the navigation tree on the left.
3. Click the “Save” button to save the existing value to .
RX Section
Front-end Filter
1. Connect the antenna connecto with the HP8921.
2. Connect the Audio Out port of with the Audio In port of the
HP8921, and set the HP8921 to RX test mode.
3. Set HP8921 as follows:
Output RF signal: -118dBm/Frequency (current channel frequency)
Modulation frequency: 1kHz
Modulation deviation: 3kHz
De-Emphasis: 750 us
4. Observe the value displayed on the HP8921 and adjust the vernier until
the SINAD value is more than 14dB.
5. Set the HP8921 as follows:
Output RF signal:
VHF: -25Bm/(current channel frequency: -29.025MHz)
6. Observe the SINAD value displayed on the HP8921 and adjust the
vernier until it is less than 14 dB.
7. Press
the Enter key on the keyboard to confirm your settings.
8. Click the “Save” button to save your settings.
RX Front-End Gain 1.Connect the antenna connector of with the HP8921, and set the
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Item Method
HP8921 to RX test mode.
2. Set the HP8921 to output -70dBm / Frequency (current channel
frequency) unmodulated RF signal.
3. Press the Enter key on the keyboard to confirm your settings.
4. Click the “Save” button to save your settings.
Receive Oscillator
Voltage
1. Connect the antenna connector of with the HP8921, and set the
HP8921 to RX test mode.
2. Open the Tuner software, go to “TUNE_DATA -> RX” and double click
“Receive Oscillator Voltage” from the navigation tree on the left.
3. Click “Save” to save the existing value to .
Mandown Calibration
1. Keep in a vertical position.
2. Open the Tuner software, go to “TUNE_DATA -> RX” and double click
“Mandown Calibration” from the navigation tree on the left.
3. Click Read button to read the calibration data.
4. Click the “Save” button to save the calibration data.
1.2.2 Testing a Radio
After tuning , it is required to test the digital RF signal.
Transmitting
Step 1 Open the Tuner software and go to “TEST -> TX”, and double click “Transmit
BER (0.153)” from the navigation tree on the left.
Step 2 Select the frequency to be tested.
Step 3 Click the “Transmit On” button.
Step 4 Set the Aeroflex 3920.
Frequency: be consistent with the frequency to be tested.
STD IB 511(.153)
Step 5 View all items on the Aeroflex 3920.
Frequency Error≤100Hz
Transmit Power: 0.8~1.2W
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FSK
Error ≤5%
Magnitude Error ≤1%
Receiving
Step 1 Open the Tuner software and go to “TEST -> RX”, and double click “Receiver
BER (0.153)” from the navigation tree on the left.
Step 2 Select the frequency to be tested.
Step 3 Set the Aeroflex 3920.
Frequency: be consistent with the frequency to be tested.
STD IB 511(.153)
Lvl: -116.0dBm
Step 4 Click the “Start” button.
Step 5 The average error rate is less than or equal to 5%.