MT-4E Analog and P25 Digital Radio Systems - Daniels Electronics

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13 15 11 9 3 7 15 11 9 3 5 7 PULL DOWN TO REMOVE ELECTRONICS LTD. MADE IN CANADA ELECTRONICS LTD. MADE IN CANADA ELECTRONICS LTD. AutoHOLD SETUP dB dB ac+dc ac+dc DIGITAL MULTIMETER FAST MN MX CANCEL LOGGING SAVE CLEAR MEM ac+dc YES NO ac+dc TEMPERATURE 22 Chapter 5: Daniels Radio System Testing SYSTEM REGULATOR TESTING System Voltage Testing The fi rst stage of testing a Daniels MT-4E radio system is to perform a basic system check on the supply and regulated voltages. The System Regulator module is designed with a convenient and easy test point built into the front panel. This test point allows a technician access to the DC supply and regulated voltages. Simply connect a standard Digital Volt Meter (DVM) to the METER jacks on the front panel of the System Regulator as shown in Figure 5-2. REPEATER CONTROL TRANSMITTER FREQUENCY (MHz) RECEIVER FREQUENCY (MHz) SYSTEM REGULATOR FUNCTION 12 1 DC SWITCH A SWITCH B TX A REF IN MICMODE USB A D NORM OFF KEY TX ANALOG DIGITAL A D SQ. DISABLE NORM OFF REF IN 11 10 9 8 VOL 7 2 3 4 5 6 + METER POWER ON HOLD MIN MAX Hz % ms nS REL RANGE RX A TX B RX B CNTL BUS MIC RF OUT USB CNTL BUS RF IN ON OFF SPKR INT EXT EXT - OFF mV V V OFF mV F C A mA A VIEW A mA A SPKR CI-RC-4L DANIELS MODEL # CODE DANIELS MODEL # CODE DANIELS MADE IN CANADA A mA A COM V Figure 5-2: System Regulator Voltage Testing The FUNCTION rotary switch on the front panel of the System Regulator will allow you to test various points in the radio system. Following is a list of System Regulator rotary switch positions, the functions they measure and the parameters measured: 1 Supply Voltage +10 Vdc to +17 Vdc (+13.8 Vdc nominal) 2 +9.5 Volts Regulated +9.5 Vdc (± 0.1 Vdc) 3 Rx A Audio Receiver A Audio (NOT Rx Balanced Output) 4 Rx A Carrier Strength 0 Vdc to +5.0 Vdc based on received signal strength (0 Vdc is a low RF signal level, +5.0 Vdc is high) 5 Rx B Audio Receiver B Audio (NOT Rx Balanced Output) 6 Rx B Carrier Strength 0 Vdc to +5.0 Vdc based on received signal strength (0 Vdc is a low RF signal level, +5.0 Vdc is high) Enter the Supply Voltage and +9.5 Volts Regulated values on the MT-4E Test Sheet and inject a -100 dBm carrier signal into the Receiver and record the RSSI Voltage on the MT-4E Test Sheet. Enter the Date, Firmware Versions and Serial numbers of the Receivers and Transmitters on the MT-4E Test Sheet. The Firmware Version and Serial Number can be found by connecting the RSS and clicking on Rx ID or Tx ID. The Serial Numbers can also be found on the side of the modules. The standby current draw of the radio system should be measured for battery / solar powered systems. Connect an ammeter to the power input line and measure the standby current draw and transmit current draw of the system. Enter the Standby Current Draw and Transmit Current Draw readings on the MT- 4E Test Sheet. The maximum standby and transmit current draw is dependent on the radio system (number and class of receivers, transmitter output power, amplifi ers, auxiliary equipment, etc.). Maintenance Guide MG-001 Daniels MT-4E Radio Systems www.danelec.com
TEST PORT SCOPE 100V MAX 100V MAX 100V MAX CH1 CH2 DVM MIC HELP RETURN AUDIO I/O MODE TAB SHIFT BKSP HOLD GHI 4 PQRS 7 * JKL 5 TUV 8 0 MNO 6 WXYZ 9 ESC ENTER POWER # 125 W MAX VOLUME SQUELCH AUDIO IN AUDIO OUT 1 AUDIO OUT 2 USB CNTL BUS A D FREQUENCY (MHz) SQ. DISABLE NORM OFF REF IN MADE IN CANADA MODEL # CODE RF IN FUNCTION 12 1 11 2 10 3 9 4 8 5 7 6 + VOL METER - EXT SPKR MADE IN CANADA OFF Chapter 5: Daniels Radio System Testing 23 RECEIVER TESTING Receiver Analog Testing Connect the IFR 2975 and Daniels Radio as shown in Figure 5-3: Rx Balanced Audio Output (from pins B26 and Z26) Computer running RSS ABC 1 2 3 DEF + - . Audio In RECEIVER SYSTEM REGULATOR POWER ON GEN T/R ANT ON OFF SPKR INT EXT DANIELS ELECTRONICS LTD. DANIELS ELECTRONICS LTD. USB from Computer to Rx T/R port from IFR 2975 to RF IN on Rx Figure 5-3: Receiver Analog Testing On the IFR 2975, recall Daniels setup 1 (Rx_Ana) from your internal drive. Enter the correct RF frequency and ensure that the deviation level of the 1.0 KHz tone is set correctly for your receiver (wide / narrow). Enter the correct CTCSS tone (if used) and deviation level for the tone. On the Daniels Radio system, ensure the receiver is turned on and turn the System Regulator Speaker switch to ON and INT. Set the FUNCTION rotary switch to position 3 for Rx A or position 5 for Rx B (depending on the receiver being tested), then turn the volume up until the 1 KHz tone is audible. In the Jumper Settings area of the Service section on the RSS, ensure that the “Subtones on audio path” selection is set to “Don’t pass” as shown in Figure 5-4. The IFR 2975 will conduct all tests with CTCSS tones on the audio, giving erroneous measurements, if the Subtones are set to “Pass”. Figure 5-4: RSS Subtone Settings MG-001 Daniels MT-4E Radio Systems www.danelec.com Maintenance Guide
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