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Linear Industries, Inc.

AT71-250
Owner’s Manual

February 2013

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Summary of Contents for AT71-250

Page 1: ...Linear Industries Inc AT71 250 Owner s Manual February 2013...

Page 2: ...of an RF Wattmeter and a calibrated dummy load Notice 4 Should accident or injury occur to the personnel engaged in the installation operation or service of the equipment they should seek proper medi...

Page 3: ...E EQUIPMENT LINEAR INC SHALL NOT BE RESPONSIBLE FOR INJURY OR DAMAGE THAT IS THE RESULT OF IMPROPER PROCEDURES OR USE BY INDIVIDUALS IMPROPERLY TRAINED OR LACKING THE KNOWLEDGE TO PERFORM ASSOCIATED T...

Page 4: ...tocking fee may be charged All returns must be sent freight prepaid and properly insured by customer When communicating with Linear please refer to your Order or Invoice Number Unpacking Use care when...

Page 5: ...microcontrollers which allows for remote supervision in real time of all transmitter functionality All operations of the AT71 250 is carried out through a keypad and digital display located on the fro...

Page 6: ...AT71 250 Transmitter Owner s Manual Linear Industries Inc All Rights Reserved 6 38 Figure 2 AT72 250 Rear View Figure 3 AT71 250 Block Diagram...

Page 7: ...ier was implemented with LDMOS transistors operating highly linearly at higher gain under high efficiency and absolute controlled thermal conditions Automatic control over the quiescent operational el...

Page 8: ...oscillator is a synthesized time based PLL via an internal OCXO Oven Controlled Crystal Oscillator at 10MHz reference or an equivalent one external reference e g a GPS signal The on channel modulated...

Page 9: ...y one RF transistor current readings and detailed descriptions about current and past alarms 4 4 3 3 R RF F P Po ow we er r S Se en ns so or r R RF F s sa am mp pl le e RF samples associated with the...

Page 10: ...ion FPC Included Signal Input Transport Stream Input ATSC MPEG2 compliant to SMPTE310M or ASI Input Data Rate 19 39 Mbps SMPTE 310M 270Mbps ASI External Reference Signal 10MHz 0 to 10 dBm Input Connec...

Page 11: ...on about the operational software configuration and operation system installed in the AT71 250 located within the AT8001 exciter Figure 4 AT8001 AT8001 Exciter Front Panel 2 Digital Exciter The Master...

Page 12: ...s represents the screen position on the command menu 2 3 Signaling Besides the LCD screen and the command keypad the front panel of AT8001 also shows a set of 4 LED s These LED s when ON indicate POWE...

Page 13: ...input Data Rate 0 19 39Mbps Null Packets Rate Measure Nulls packages 0 19 39Mbps FIFO Occupation 0 100 RF AMPLIFIERS DRAWER POWER 50V Power Supply for the RF power drawer RF Forward Power per each dra...

Page 14: ...hit ENTER Hit key 3 to view the other screens that are part of this menu Hit ESC key to return to the prior screen Main Menu 0000 Setup Menu System Alarms Log Measurements Remote Access Power Transpor...

Page 15: ...ns below starting on the main menu screen Access Measurements Select Transport Stream and hit ENTER Hit ESC key to return to the prior screen Main Menu 0000 Setup Menu System Alarms Log Measurements R...

Page 16: ...R To select a specific drawer press the keys 2 or 4 Select Current and press ENTER Power Transport Stream Drawer Measurements 2000 Exciter Power Supply Communication Status Power Supply Drawer Measure...

Page 17: ...ess ENTER Use the Up and Down keys 1 and 3 to check the voltage status on the DTV exciter To return to the Main Menu press ESC key Drawer Measurements 2300 Power Current Temperature Drawer Temperature...

Page 18: ...ion Status and press ENTER Press the ESC key to return to the Main Menu 4 5 Voltages from the Power Supplies To check the status of the value and presence of the power supplies start from the Main Men...

Page 19: ...RENT ALARM The third LED indicates a past alarm see PAST ALARM This situation that past alarm is no longer present On normal operation just a green LED is ON which confirms that the AC input power is...

Page 20: ...longer present LED ON for past alarm LED OFF for current alarms and the date and time mark when it ceased to occur The alarm log keeps up to 100 registers The Clear Alarm Log if selected erases the al...

Page 21: ...rm LED ON Fifo Overflow Overflow on FIFO at the modulator Alarm LED ON 15V Fail Lack of 15V Alarm LED ON 8V Fail Lack of 8V Alarm LED ON 3V Fail Lack of 3V Alarm LED ON 27V Fail Lack of 27V Alarm LED...

Page 22: ...al parameters See below all possible operations under the SETUP menu Items on the SETUP menu Description Power Setup Program the RF output power level Frequency Setup Program the RF UHF Channel of the...

Page 23: ...ase the power or 4 to decrease the power Once the desirable power level is adjusted press ENTER for software acknowledgement otherwise the change will not become effective Setup Menu 250 Power Setup I...

Page 24: ...ess ESC to return to Frequency Setup Select Offset and press ENTER The offset can be configured within 1Hz steps in a 65536 Hz scale Setup Menu 250 Power Setup Image Frequency Suppression Frequency Se...

Page 25: ...e frequency suppression on the superior side band spectrum region An RF sample for monitoring purposes must be taken before the output mask filter The amplitude values are shown in dB and the phase re...

Page 26: ...s Using the keys it s possible to activate or deactivate the linear and non linear pre correction ON Activate Pre correction OFF Deactivate Pre correction 7 5 Pre correction adjustment Press ESC to re...

Page 27: ...On this screen option is possible to turn on and off the modulation process It is also possible adjust the pilot level rating from 2048 to 511 Press ESC up to the SETUP MENU screen Pre Correction Set...

Page 28: ...s 1 e 3 set the arrow heard underwriting on each one of the 4 password position The 1 and 3 keys increase or decrease the numerical value of the chosen position Once you reach this screen it is just p...

Page 29: ...Level Power Supply voltage readings Alarms and Other functional parameters Can be monitored on two possible ways Via Front Panel Local access via LCD screen and keypad as shown on this section it is p...

Page 30: ...nfigure the IP using the keys 1 or 3 and 2 or 4 8 2 Mask Configuration Press ESC up to the Remote Access screen Select Subnetwork Mask and press ENTER Configure the Mask using the keys 1 or 3 and 2 or...

Page 31: ...Rights Reserved 31 38 8 3 Gateway Configuration Press ESC up to the Remote Access screen Access Gateway and press ENTER Configure the gateway address using 1 or 3 and 2 or 4 Remote Access 3000 IP Addr...

Page 32: ...al Linear Industries Inc All Rights Reserved 32 38 300W UHF ATSC Power Amplifier Drawer Model GV4790 Functional Description The drawer GV 4790 is a UHF broadband power amplifier unit air cooled design...

Page 33: ...the transistors are welded on the same aluminum base plate This arrangement insures the excellent heat transfer performance and RF grounding at the same time The set of assembled components constitut...

Page 34: ...MRF6VP3450H This module has the final stage of solid stage RF amplifier is set under the push pull circuit topology At its RF output it is able to delivery up to 170Wrms ATSC It is a single stage and...

Page 35: ...on system MOD 4812 DC DC 2kW Power Supply The 4812 module is a DC DC converter with 370 Vdc input and 50Vdc output Its function is to lower the voltage delivered by the AC DC converter with PFC Phase...

Page 36: ...ominal Output Voltage 370 Vdc Nominal Power 2kW Max Current 5 5A MOD CIM 3747 and MOD CIM 3779 Control Board and Inter connections Board The main digital control unit board is named CIP 8609 This boar...

Page 37: ...d CIM 3886 MOD 24V Power Supply and V I readings The module 3886 is a circuit CIM which has functions of performing readings of current voltage It converts the voltage of 50 V to 24 VDC and also filte...

Page 38: ...the transistor and chooses the best rotation of the fan at that temperature MOD VENP 4893 Front side bank of fans This module is the bank of fans locates on the front side of the drawer It is compris...

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