User's Manual

P25net Channel Controller Operations Manual
3-12
3.9.3.5 Start an IMBE test tone using PCCT.
3.9.3.6 Tune the test set to P25 mode and listen for a 1200Hz sine wave in the
monitor speaker set to demodulated audio. A P25 Handset may also be
used for this step if tuned to the proper frequency in conventional P25
mode.
3.9.3.7 If the test tone is not heard, it may be necessary to invert the Tx audio. This
is done by putting a minus (-) sign in front of the Tx Vco Gain number (see
Figure 3-13). If the tone is heard then Tx calibration is complete. PCCT
writes the Tx calibration settings to the Channel Card when the PCCT
application is closed.
Figure 3-13 Configure Tx Window: Minus Sign for Tx Vco Gain
3.10 Rx Calibration
Receive calibration adjusts the P25net CC audio input level to match the radio line audio output
level and calibrates the P25net CC for the RSSI signal from the receiver.
3.10.1 Equipment Setup
Connect the equipment as shown in Figure 3-14.