1. Press the Menu key then select the P25 2 Signal Analyzer icon or press Shift and then the Mode (9) button to open the Mode Selector dialog box. Highlight P25p2 Analyzer and press Enter.
Caution
The maximum input power without damage is 2 watts (+33 dBm) to the RF In 50 Ohm connector. To prevent damage, use a coupler or attenuator to reduce the input power to below this level when measuring high output power devices.
2. Connect the transmitter to the RF In50 Ohm connector on the LMR Master using a coupler or attenuator.
3. Press the Frequency main menu key to set the receiver center frequency (Rx Freq) of the measurement. Use the arrow key, rotary knob or the numeric keypad. When using the keypad, select the appropriate terminator submenu key to set the center frequency.
4. Press the Setup main menu key to select the modulation type. Select Base Station or Mobile Station using the Mod Type key.Press the Rx pattern key to choose the pattern against which to measure error rates. 1031 Hz will measure BER directly against the selected pattern. Voice uses a proprietary method to estimate BER from regular voice traffic. Ctrl Channel will produce a Message Err Rate (MER) based on the CRC checksums contained in Control Channel messages and estimated BER using a proprietary algorithm.
5. Select the TDMA slot (0 or 1) using the Rx Slot submenu key.
6. Press the Amplitude main menu key, then the Rx Power Offset submenu key to set the receiver attenuation (or gain). Use the arrow keys, rotary knob or the numeric keypad to enter the adjustment value, up to 100 dB and select either the Loss or Gain submenu key. The offset will be applied to the Carrier Power value in the Demodulation Summary graph. For instance, if the transmitter under test is emitting 50 watts (+47 dBm) of power, and the External Attenuation value is 40 dB (such as from a 40 dB directional coupler) the Carrier Power displayed will be +7 dBm.
7. Press the Measurement key, then the P25p2 Analyzer submenu key. Select the Graph types to view with the Graph Type submenu key. The Symbol Span submenu is used to adjust the number of “eyes” displayed across the screen in the Eye Diagram graph. Refer to P25p2 Analyzer Graphs on the available graph types.
Over the Air (OTA) Analysis Setup
1. Press the Menu key then select the P25 2 Signal Analyzer icon or press Shift and then the Mode (9) button to open the Mode Selector dialog box. Highlight P25p2 Analyzer and press Enter.
Caution
The maximum input power without damage is 2 watts (+33 dBm) to the RF In 50 Ohm connector. To prevent damage, use a coupler or attenuator to reduce the input power to below this level when measuring high output power devices.
2. Connect an antenna with the appropriate frequency range to the RF In50 Ohm connector on the LMR Master.
3. Press the Frequency main menu key to set the center frequency of the measurement using the Rx Freq key. Use the arrow key, rotary knob or the numeric keypad. When using the keypad, select the appropriate terminator submenu key to set the center frequency.
4. Press the Setup main menu key to select the modulation type. Select Base Station or Mobile Station using the Mod Type key.Press the Rx pattern key to choose the pattern against which to measure error rates. 1031 Hz will measure BER directly against the selected pattern. Voice uses a proprietary method to estimate BER from regular voice traffic. Ctrl Channel will produce a Message Err Rate (MER) based on the CRC checksums contained in Control Channel messages and estimated BER using a proprietary algorithm. Refer to P25p2 Analyzer Graphs on the available graph types.
5. Select the TDMA slot (0 or 1) using the Rx Slot submenu key.
Using the Signal Generator for Receiver or OTA Analysis
1. Press the Menu key then select the P25 2 Signal Analyzer icon or press Shift and then the Mode (9) button to open the Mode Selector dialog box. Highlight P25p2 Analyzer and press Enter.
Caution
The maximum output power from the Signal Generator Out connector is 1 mW (0 dBm) and the frequency range is 500 kHz to 1.6 GHz.
2. Direct connect the LMR Master Signal Generator Out50 Ohm connector to the repeater/receiver or connect an antenna with the appropriate frequency range to the connector.
3. Press the Frequency main menu key to set the transmit frequency using the Tx Freq key. Use the arrow key, rotary knob or the numeric keypad. When using the keypad, select the appropriate terminator submenu key to set the center frequency.
If testing a P25p2 repeater, you can bind the transmit frequency to the receive frequency by setting Rx/Tx Coupling to On and entering the Coupling Offset.
Note
When Rx/Tx Coupling is on, the Tx Freq submenu key is disabled.
4. Press the Amplitude main menu key, then the Tx Output Lvl submenu key to set the output power. Enter any output attenuation or gain using the Tx Power Offset key.
5. Set the transmit pattern by pressing the Setup main menu key then the Tx Pattern submenu key. Available patterns are listed on the display and additional patterns can be downloaded via the System > Application Options menu.
6. Select the TDMA slot (0 or 1) using the Tx Slot submenu key.
7. Press the Turn Sig‑Gen ON main menu key to start the signal generator. Press the key again to turn off the signal generator.