Viavi CX100 ComXpert Operation Manual page 197

Chapter 6 Performing Tests and Measurements
AM Transmitter Testing
3. Select RF Test.
4. Select either Duplex or Tx Test tab.
NOTE
If operating in Duplex Mode, verify RF Generator is turned OFF.
5. Open the RF Receiver panel.
6. RF Receiver Port: select DUPLEX.
7. RF Receiver Frequency: set to 116.5 MHz.
8. RF Receiver Reference Level: set to 37 dBm.
NOTE - Use of External Attenuator
The expected transmit power of the UUT is 50 Watts (47 dBm) which is the maximum
input power of the CX100, so an external attenuator is required for this test.
The UUT transmits at 47 dBm through the 10 dB external attenuator, reducing the
amplitude received by the CX100 to 37 dBm (5 W), therefore the Reference Level of
the CX100 is set to 37 dBm so that the power measurements factor in external
attenuation to reflect the actual power generated by the UUT.
9. RF Receiver Demodulation Type: select AM.
10. RF Receiver IF Bandwidth: select 6.25 kHz.
NOTE - IF Bandwidth Selection
For this test, the UUT will generate AM using a 1 kHz tone, which is a narrow-band
signal, so the IF Bandwidth is set to the narrowest setting of 6.25 kHz.
NOTE - AF Filter Selection
The UUT distortion is specified as being measured with a 300 Hz to 3 kHz band pass
filter, so the AF Filter field is set to Band Pass to filter.
Rev 002
6 - 12
CX100 ComXpert Operation Manual 22144015
August 2023