MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
Chapter 5: Codan Radio System Testing
Page 56
There are no specifi c measurements to make on this test, just verify that the system is operating
correctly.
NAC:
Check to make sure your receiver unsquelches on the proper NAC. If the NAC is set for $F7F in the
receiver, ensure that the system transmits the NAC it receives.
TGID:
Check to make sure your receiver unsquelches on the proper TGID code (if used). Ensure that the
system transmits the TGID code it receives.
Unit ID (SID):
Ensure that the system transmits the Unit ID code it receives.
*After changing the TGID or Unit ID the SEND button in the DOWNLINK DATA window must be clicked
to send the information.
*The TGID and Unit ID programmed into the transmitter via the RSS are only transmitted when keying
the transmitter in a non-repeater mode (see the Transmitter Digital Testing). In repeater mode the
system transmits the TGID and Unit ID it receives.
Emergency Bit (EMG):
Ensure that the system transmits the Emergency Bit it receives.
Algorithm ID:
The Algorithm ID is typically set for 80 for CLEAR operation.
To ensure encrypted signals will pass through the repeater:
1. Click on the DOWNLINK DATA window to open the full window.
2. Set the ALGID to 81 or select the DES option in the box to the right (this will change the ALGID to
81).
3. Ensure the KEY ID is set to 0000.
4. Click on the UPLINK window to open the full window. In the ES DATA portion of the window the
KID will read 0000, the ALGID will read 81, and the MI data will be constantly changing.
5. Check the P25 Digital Repeat Capability Checked box on the MT-4E Test Sheet.
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