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8. Tuning Description
8.1 Required Test Instruments
Radio communication test sets: HP8921 and Aeroflex 3920
Power supply: 15 A/30 V
Multimeter
Tuner software
8.2 Tuning Procedures
8.2.1
Tuning the Radio
After re-assembling the radio, you need to tune it with the Tuner software and HP8921.
The specific operations are described in the table below. After tuning the items of the current channel,
you must switch the radio to the next channel; otherwise, the adjustments will not be saved to the radio
properly.
Items Method
TX Section
Warp
1.
Connect the radio to HP8921 via the antenna connector, and set HP8921
to TX test mode.
2. Open the Tuner software and go to “TUNE_DATA -> TX -> Reference
Oscillator Warp” in the left navigation tree. Then click the “Transmit On”
button.
3.
Adjust the vernier on the Tuner until the frequency offset between the
frequency displayed on HP8921 and the frequency (Tx) displayed on
Tuner is less than or equals to ±40 Hz.
4. Click the “Save” button on Tuner to save the existing value to the radio.
5. Click the “Transmit Off” button on Tuner.
Calibration
Here takes the tuning of low TX power for example.
1.
Connect the radio to HP8921 via the antenna connector, and set HP8921
to TX test mode.
2. Open the Tuner software and go to “TUNE_DATA -> TX -
> Transmit
Power Calibration” in the left navigation tree. Then select an appropriate
channel.
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