DB Elettronica Telecomunicazioni MOZART Series Calibration Manual Download

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Mozart series calibrating procedure

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Go to “[07] Alarms” menu on the display and set the REFL Warning to 100%.

Fig. 21 – Set REFL warning

Press RF ON/OFF button on the front panel to enable the RF.

Disconnect the 50ohm load from the rear of the amplifier.

On the 001-000166-02 board adjust the RT5 trimmer to set the reflected power at the

same value of the forward power (ex: FWD power: 250W = RFL power: 250W).

Fig. 22 – Control board RT5 adjust

Summary of Contents for MOZART Series

Page 1: ...rating procedure 1 19 PROCEDURE TO CALIBRATE A MOZART Release 1 0 DB ELETTRONICA TELECOMUNICAZIONI S p A Riviera Maestri del Lavoro 20 1 35127 Z I SUD PADOVA ITALY Ph 049 870 0588 Fax 049 870 0747 http www dbbroadcast com ...

Page 2: ...update Document History Rev Date Name Details 1 0 June 2014 AB Issued June 2014 Version 1 0 2014 Copyright by DB Elettronica Telecomunicazioni SpA Riviera Maestri del Lavoro 20 1 35127 Z I SUD PADOVA ITALY All rights reserved All specifications characteristics and circuit descriptions indicated in this manual are subject to change without notice ...

Page 4: ...er please follow the next steps STEP 1 FILTER CHECK Before starting to calibrate the Mozart the output filter must be calibrated using a Network Analyzer Below the best results of a calibrated filter are shown Fig 1 Output filter result nr 1 Fig 2 Output filter result nr 2 ...

Page 6: ... 01 POWER SUPPLY BOARD On the 001 000185 01 power supply board check if a the 44VDC input power is present b 15VDC 15VDC 12VDC 12VDC and 5VDC output power are present Fig 4 001 000185 01 DC DC converter 44VDC GND GND 5VDC 12VDC GND 12VDC 15VDC GND 15VDC ...

Page 8: ...Mozart series calibrating procedure 8 19 h After the process is complete switch off the Mozart amplifier and connect to it a 50ohm load to output Fig 7 50ohm load connection ...

Page 9: ...4 RF POWER CHECK a On the 001 000181 01 board PLL VCO board disconnect the RF output coax cable SMB connector from the board b On the rear of the amplifier make a short circuit on the ENABLE connector INTERLOCK Fig 8 ENABLE short circuit INTERLOCK ...

Page 10: ...ER MODULE This step is only for Mozart 50 150 300 500 and 1000 c Disconnect the power cables from the RF amplifier module pallet which go to 48V main power supply and connect an amper meter in series Fig 9 Amper meter diagram Fig 10 Amper meter in series ...

Page 12: ... Fig 13 500W RF amplifier module Fig 14 1KW RF amplifier module 30W RF DRIVER MODULE The steps below are only for Mozart 500 and 1000 with the indicated values for the other models please see the table below with the right values of components ...

Page 13: ... have the maximum voltage on the drain of the Q3 mosfet The approximate voltage is 18 5V Fig 15 30W RF module RT4 adjust b Adjust the RT2 trimmer to have a voltage drop of 20mV on the R22 resistor Fig 16 30W RF module RT2 adjust c Adjust the RT1 trimmer to have a voltage drop of 10mV on the R36 resistor ...

Page 14: ... 5V Mozart 50 80mV 18 5V Mozart 150 5mV 2 5mV 18 5V Mozart 300 10mV 5mV 18 5V Mozart 500 20mV 10mV 18 5V Mozart 1000 20mV 10mV 18 5V d Press RF ON OFF button on the front panel to disable the RF and switch off the amplifier e Disconnect the amper meter and reconnect the power cables to the RF amplifier module At this point the RF Power modules were calibrated successfully ...

Page 15: ... b Switch on the amplifier and check if the Set Pout is set to maximum on the 02 Power Fwd menu on the display If not set the output power to maximum c Press RF ON OFF button on the front panel to enable the RF d On the 001 000166 02 board adjust the RT7 trimmer to set the maximum power of the amplifier Fig 18 Control board RT7 adjust ...

Page 17: ... Set REFL warning d Press RF ON OFF button on the front panel to enable the RF e Disconnect the 50ohm load from the rear of the amplifier f On the 001 000166 02 board adjust the RT5 trimmer to set the reflected power at the same value of the forward power ex FWD power 250W RFL power 250W Fig 22 Control board RT5 adjust ...

Page 19: ... 10 Fig 25 FOLD BACK REFL and REFL WARNING are set to 10 j Press RF ON OFF button on the front panel to enable the RF k Disconnect the 50ohm load from the output of the amplifier The led WARNING will be turned on Check if the FWD power is 10 of SET Pout ex The FWD power must be 25W with WARNING turned on because before this we have set the FWD power to 250W ...