Freedom R8000 Series User manual

Application Note:
Testing Motorola P25 Phase 2 Radios Using
the Freedom Communications System Analyzers
FCT-1009A

Application Note
Testing Motorola P25 Phase 2 Radios Using the Freedom Communications System Analyzers
2
Scope
This application note is focused on testing the P25 Phase 2 digital capabilities of the radio. For additional information on
analog and Phase 1 conventional mode testing, please refer to the appropriate app note. For information on our AutoTune
option for the R8000, please reference the Operator’s Manual and radio-specific User’s Guide available on our website
(www.freedomcte.com).
This procedure is to be performed after the radio has been aligned and tested in analog mode according the procedures in
the radio’s service manual.
Motorola CPS and Tuner Software
Motorola provides a CD containing software programming facilities for the radio’s channels and functions (CPS). The Tuner
software is intended to provide adjustment and realignment of several of the radio’s parameters, such as RX front end and
RF Power.
Radio Configuration
No custom channels are required to test the Phase 2 capabilities of the radio.
Note: All tests MUST BE conducted in test mode using Motorola’s Tuner software.
Conducting P25 Phase 2 Tests with the R8000
It is important to note that Phase 2 makes use of two separate digital modulation schemes for uplink/downlink. For inbound
transmissions, the portable/mobile radios transmit using H-CPM. For outbound transmissions, the base station transmits
using H-DQPSK.
Conducting P25 Phase 2 Tests with the R8000
It is important to note that Phase 2 makes use of two separate digital modulation schemes for uplink/downlink. For inbound
transmissions, the portable/mobile radios transmit using H-CPM. For outbound transmissions, the base station transmits
using H-DQPSK.
P25 Phase 2 voice channels are 12.5 kHz wide and contain two time slots. Each slot carries a separate channel of traffic.
This means the portable/mobile radio is only transmitting 50% of the time.
Transmitter Tests
The following tests are performed to verify the Phase 2 functionality of the transmitter:

Application Note
Testing Motorola P25 Phase 2 Radios Using the Freedom Communications System Analyzers
3
• Modulation Fidelity
• Symbol Deviation
• Bit Error Rate Calculation
Radio Setup
• Connect radio’s Programming cable to USB on PC
• Setup Tuner Software
oOpen APX Tuner software on PC
o“Read Device” > wait… > Record radio serial number
o“Performance Testing” > “Transmitter Test Pattern”
o“Test Pattern Type” > “Phase 2 Digital – 1031 Hz Test Pattern”
o“TX Power” > “Low”
oRecord displayed Test Frequency
R8000 Setup
• Connect Radio RF antenna connector to R8000 RF In/Out port
• Return Analyzer to factory default settings
o“Test”
o“Presets”
o“Load Factory Configuration”
• Set Test Mode to P25 Phase 2
o“Test” (if presets are shown, press ESC)
o“Test Mode” > “More (1 of 2)” > “P25 II”
o“ESC” to main screen
• Configure Display to Eye Diagram
o“Display Zone” or “4” shortcut key
o“Select Display” > “Eye Diagram” on horizontal soft key
o“ESC”
oMETER Zone or “7” shortcut key
oSelect Meter” > “Constellation
o“ESC”
• Configure Modulation Type and Test Pattern
o“P25 II” Zone or “2” shortcut key
o“Modulation Type”
oIf testing portable/mobile: “H-CPM”; if testing base station: “H-DQPSK”
o“Test Pattern” > “1031 Hz Tone”
• Configure R8000 monitor frequency
o“RF zone” or “1” shortcut key
o“Monitor Frequency” > Enter Tuner test frequency > “Enter”
Begin Test
• Verify RF cable present from Radio to R8000
• In Tuner, select “PTT Toggle” to key the radio
• If R8000 and Radio configured properly, Eye Diagram and Constellation Meter will update.
• In “P25 II” Zone, record readings:
o“Mod Fidelity” (standard limit < 5%)
o“Symbol Deviation” (standard limits 2995 Hz to 3310 Hz)
• Perform Bit Error Rate (BER) test
o“P25 II” zone
o“BER Test” > “Start”
oRecord BER (standard limit < 0.01%)
o“BER Test” > “Stop”

Application Note
Testing Motorola P25 Phase 2 Radios Using the Freedom Communications System Analyzers
4
Receiver Test
The following tests are performed to verify the Phase 2 functionality of the receiver:
• Digital Sensitivity (BER)
Radio Setup
• Setup Tuner Software
o“Performance Testing” > “Bit Error Rate”
o“Test Pattern” > “Phase 2 Digital – 1031 Hz Test Pattern”
oRecord displayed Test Frequency
R8000 Setup
• Configure Generate Mode
o“Generate”
• Configure Modulation Type and Test Pattern
o“P25 II” Zone or “2” shortcut key
o“Modulation Type”
oIf testing portable/mobile: “H-DQPSK”; if testing base station: “H-CPM”
o“Test Pattern” > “1031 Hz Tone”
o“Modulation Mode” > “Continuous”
• Configure R8000 generate frequency
o“RF zone” or “1” shortcut key
o“Generate Frequency” > Enter Tuner test frequency > “Enter”
• Configure R8000 output level
o“Output Level” > “-100 dBm”
Begin Test
• Verify RF cable present from Radio to R8000
• In Tuner, select “Start/Stop” to start reporting BER
• At -100 dBm, the BER should read “0.0000%”
• Decrease R8000 output power in 1dB increments until BER reads above 5%
• Increase R8000 output power in 0.1dB increments until the BER is below 5%
• Record output power as Digital Sensitivity of the radio. (should be < -116 dBm)