User's Manual

P25net Channel Controller Operations Manual
3-1
3 Radio Calibration
3.1 Calibration Overview
The channel card in the P25net CC must be calibrated to the connected radio. This process
adjusts the internal audio circuits within the P25net CC to adapt to the radio’s audio levels and
sets the transmit deviation for P25 narrowband requirements. In addition, the RSSI signal from
the receiver is characterized by the P25 processor to enable proper synchronization to the P25
packet data streams.
Each transceiver radio has different physical components from other types of transceivers and
even from other transceivers of the same make and model. Because of this, each transceiver
channel in the P25net CC has to be tuned to ensure an optimal receiver and transmit signal are
produced. This is a critical step and if not performed will render the channel partially or
completely incapable of P25 operation.
PC Tools (PCCT) is an application that runs on a pc and provides the necessary controls to
perform the calibration. PCCT also allows setting various operational parameters (such as
Fallback Mode) and performing testing. See Chapter 4 for PCCT advanced features.
3.2 Equipment Required
• PCCT Running on a PC (preferably a Laptop)
• CAT 5 LAN cable
• RF Test Set (preferably with APCO 25 test capability) such as the Aeroflex
3920 as used in the following example
• A pair of conventional P25 portable radios (handsets) with programming
software and cable to allow programming to the base radio channel.
3.3 Installing PCCT
The PCCT application is installed by running the Windows installer package PCCTSetup.msi.
If this file does not run automatically from a supplied CD, find this file and execute it. The
initial splash screen as shown below will then be presented to the user. As with most of these
dialog boxes presented during the installation process the “Next” button moves to the next
stage of the installation and the “Back” button returns to the previous dialog box.