1.2.3.7 Modulation
1. Select
Tx Power/Mod
page.
2. Select Channel 0.
3. Select the 0.5W power level.
4. Set the microphone input signal from the Audio Generator to 1000Hz at 100mV RMS.
5.
Adjust the VCO Modulation Limit slider for a maximum peak deviation of ±2.3kHz
6. Reduce the microphone input level to 10mV RMS and check that the deviation is within the range
±1.25 kHz to ±1.75 kHz.
7.
Repeat steps 2 to 7 inclusive for the remaining 3 Channels (1, 2, & 3).
8.
Remove the microphone audio input signal.
9. Select the Generate Square Wave function.
10. Select PTT and, while viewing the de-modulated signal on the transceiver test set oscilloscope, adjust
the
Modulation Balance
slider for the best square wave symmetry.
Note. DC coupling is required on the scope for optimum setting accuracy.
11. Repeat steps 8 to 11 inclusive for the remaining 3 Channels (1, 2 & 3).
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