• Connect the MA25200A to the S412E RF In port and USB port.
• Connect the base station RF output to the MA25200A Tx/Rx port.
• Connect the base station signal input port to the S412E Signal Generator Out port.
• Terminate the MA25200A Sig Gen input with a 50 Ω termination or calibration component.
Base Station Transceiver connected to LMR Master with a MA25200A High Power Tx/Rx Input Protection Module
2. Set the base station to the desired simplex mode frequency (transmit and receive frequencies set to the same values) to receive a P25 1011 Hz test pattern.
3. From the S412E Frequency menu, set the following:
• Rx Freq: test frequency
• Tx Freq: test frequency
• Rx/Tx Coupling: On
• Coupling Offset: 0 Hz
• Span: 25 kHz
4. From the S412E Amplitude menu, set the following:
• Ref Level: –20 dBm
• Scale: 10 dB/div
• Rx Power Offset: 40 dB External Loss
• Auto Rx Range: On
• Tx Power Offset to 40 dB External Loss
• Tx Output Level: –120 dBm (initial setting)
From this point, the S412E signal generator and analyzer measurements are both referenced from the MA25200A Tx/Rx port.
5. Turn the S412E Signal Generator On and use the Setup menu to set the default 1011 Hz Rx Pattern and p25_1011 Tx Pattern.
6. Return to the Amplitude menu and adjust the Tx Output Level until the signal can no longer be distinguished from the measurement noise by the receiver.
7. Note the Tx Output Level is the receiver sensitivity value.
Measuring Transmitter Modulation
8. Turn off the S412E signal generator.
9. Transmit the base station RF output test signal into the MA25200A Tx/Rx input and note the receiver summary data table on the S412E display.
