AUTV/250LD LDMOS - UHF TV Solid State Amplifier CODE APT134A TITLE AUTV/250LD REV 0 DATE 06/11/03
Registration number: IT-17686 Registration number: IT-24436 SS 96 Km 113 70027 Palo del Colle (Ba) ITALY Tel. +39 (0)80 626755 Fax +39 (0)80 629262 E-mail: elettronika@elettronika.it Web site: http://www.elettronika.
WARNING The apparatus described in this manual has been designed and manufactured with devices to safeguard the users. In any case it is recommended that during any operation of installation, maintenance, miscellaneous interventions and calibrations requiring the apparatus to be switched on, THE USER TAKES ALL THE PRECAUTIONS AGAINST INCIDENTS It is required to use the proper clothes and protection gloves in order to prevent damages from incidental contacts with high-voltage parts.
Warranty Summary of warranty We, ELETTRONIKA S.r.l., SS096 Km 113 Z.I. PALO DEL COLLE (BA) ITALY, warrant to the ORIGINAL PURCHASER of a NEW product, for a period of one (1) year from the date of purchase by the original purchaser (the “warranty period”) that the new ELETTRONIKA product is free of defects in materials and workmanship and will meet or exceed all advertised specifications for such a product.
INTRODUCTION The apparatus described in this manual is the latest of this series, offering high performances, remarkable reliability and a wide range of characteristics, it all at a competitive cost. Its is easy to install and use. It only takes to follow the installation procedure as shown in this manual: after having removed all from the package, you only have to follow step by step the description in the various sections.
WARNING! The currents and voltages in this equipment are dangerous! Personnel must at all times observe safety regulation! This manual is intended as a general guide for trained and qualified personnel who are aware of the dangers inherent in handling potentially hazaedous electrical and electronic circuits. It is not intended to contain a complete statement of all safety precautions which should be observed by personnel in using this or other electronic equipment.
Treatment of electrical shock 1) If victim is not responsive follow the A, B, C’s of basic life support. PLACE VICTIM FLAT ON HIS BACK ON A HARD SURFACE A - AIRWAY B - BREATHING If unconscious, open airway lift up neck, push forehead back, clear out mouth if necessary, observe for breathing. If not breathing, begin artificial breathing. Tilt head, pinch nostrils, make airttght seal, 4 quick full breaths. Remember mouth to mouth resuscitation must be commenced as soon as possible.
2) If victim is responsive: - keep them warm; - keep them as quiet as possible; - loosen their clothing (a reclining position is recommended). FIRST-AID Personnel engaged in the installation, operation, maintenance or servicing of this equipment are urged to become familiar with first-aid theory and practices. The following information is not intended to be a complete first-aid procedure, it is brief and is only to be used as a reference.
Communication N°1 -2002/95/CE - RoHS Directive Further to the directives issued by the European Community, 2002/95/CE, 2002/95/CE and 2003/108/ CE, and to the Italian Decree of Law n° 151 dated 25 July 2005, this is to inform the customers of Elettronika S.r.l.
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LDMOS - UHF TV AMPLIFIER AUTV/250LD User’s manual 11
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Section 1 - Information Contents: 1.1 Description 1.
AUTV/250LD LDMOS - UHF TV AMPLIFIER 1.1 DESCRIPTION The amplifier AUTV/250LD is an apparatus designed to be used as final power stage or driver for higherpower amplifiers in the UHF TV band. It is able to supply a power of 250W (peak sync.) in class AB and is completely realized with LDMOS technology. The power supply of the apparatus is given by a switching power supply for the RF power module and a traditional transformer for the control board.
1.2 TECHNICAL CHARACTERISTICS RF SECTION Frequency range Output power Gain RF Input impedance RF Output impedance I.M.D.
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Section 2 - Installation Contents: 2.1 Operating environment 2.2 Preliminary operations 2.3 Telemeasuring socket connections 2.4 RS232 / RS485 Socket connections 2.5 Control system 2.
2.1 OPERATING ENVIRONMENT You can install the apparatus in a standard component rack or on a suitable surface such as a bench or desk. In any case, the area should be as clean and well-ventilated as possible. Always allow for at least 2 cm of clearance under the unit for ventilation. If you set the apparatus on a flat surface, install spacers on the bottom cover plate. If you install the apparatus in a rack, provide adequate clearance above and below.
Before powering fully the apparatus, check that the output connections of the coaxial cable to the antenna system are working. In order to this it is possible to check the indication of the reflected power at low power levels. Only if the SWR indication on the display is 0, the output power can be slowly increased. At maximum output power, some watt might be shown as reflected power 2.
2.5 CONTROL SYSTEM The control system allows the user to monitor the most important measures of the transmitter, voltage and current of the power supply, temperature of the RF board, forward and reflected power, by using the two keys placed on the frontal panel. The turn-on key allows to turn on and off the transmitter. In case one of the monitored measures is in alarm, the transmitter will show this. If the value of the measure goes back to normal, the control system will turn on the transmitter again.
Front panel 1 LCD Display 2 RF Monitor connector 3 Function keys 4 Status LEDs 5 Main switch 1 3 4 5 2 DESCRIPTION 21
Rear panel DESCRIPTION Power supply socket 2 Auxiliary socket 3 Breaker 4 RS232 Socket 5 Telemeasuring socket 6 RF Output connector 7 RF Input connector 3 1 4 GND 2 5 6 7 1 22
_______________________________________________________________________________________________ Section 3 - Diagram Contents: - Cable diagram - AUTV/250LD Component layout - RF Section Block Diagram - SCH0192AR0 (250W UHF LDMOS Amplifier module) - SCH0122BR1 (Control board and display) - SCH0128AR1 (Amplifier interface) - E0012 (SP500/27-48 Switching power supply) - 06604A (UHF TV Output Filter IMD Suppressor) 23
200W UHF LDMOS AMPLIFIER MODULE SCH0192AR0 DESCRIPTION The RF module is an integrated TV linear amplifier designed for UHF band, this module employs push-pull LDMOS technology in order to achieve very good efficiency, high linearity and reliability. LDMOS transistors operate in AB class. It is a wideband amplifier over the full frequency, no adjustment is required for the channel change. The board includes RF section amplifier, bias circuit, protection circuit and matching networks.
- Curve response graphic Middle frequency 660MHz, span 500MHz, 2dB/div., reference to the arrow CALIBRATION PROCEDURE - Technical characteristics Power supply voltage Polarisation current Gain for low signal 32V (± 2%) 1.0 cold for each device (2A total), ± 0.
- Calibration steps STEP 1. Close the input and the output of the module by connecting them to a 50Ω Ω dummy load and connect the spectrum analyser through a directive sample, in order to look for self-oscillation of the module, if any (anyway the module has been designed so that it would not self-oscillate even if totally decoupled, without any input or output load). STEP 2.
capacitive trimmers, between the two pair of gates, as shown by the mounting plan. STEP 5. Connect serially a c.c. amperometer to the power supply, with scale starting from more than 5A (i.e. 10A). STEP 6. Power the module and check the MOSFET is not absorbing current; this means that the device is integral and working correctly. STEP 7.
Component layout SCH0192AR0 31
COMPONENT LIST SCH0192AR0 REF.
REF.
REF. DESCRIPTION ELETTRONIKA CODE B2 B3 B4 L1 L2 L3 L4 H1 H2 NTC1 NTC2 IC1 IC2 DZ1 DZ2 DZ3 DZ4 DL1 DL2 PN964AR3 COAX 2:1 BALUN COAX 4:1 BALUN COAX 4:1 BALUN 4 TURNS SILV. COP. WIRE 1.2mm WOUND ON OD 5mm 4 TURNS SILV. COP. WIRE 1.2mm WOUND ON OD 5mm ½ TURN COIL ½ TURN COIL HYBRID COUPLER 3dB 90° ANAREN HYBRID COUPLER 3dB 90° SAGE NTC 100KΩ PTH NTC 100KΩ PTH DG419DY DG419DY 15V SMD ZENER DIODE 15V SMD ZENER DIODE 6.8V SMD ZENER DIODE 6.
CONTROL BOARD AND DISPLAY SCH0122BR1 DESCRIPTION The control board performs all the logic and control fucntions of the amplifier. Both the RF and power supply parameters are continuously monitored in order to guarantee optimal performance in every working environment: - amplifier supply voltages - amplifier supply currents - power module working temperature - amplifier forward RF power - amplifier reflected RF power Vdc; Idc; Temperature; FWD Power. REF Power.
Note: When changing the voltage of the device from 230 to 110VAC, it also takes acting on the SW3 switch on the display board. Failure to do this may result in damages to the device.
COMPONENT LIST SCH0122BR1 Part Name/Number Description Qty. Comps.
Part Name/Number Description Qty. Comps. Page 2/2 R 1K0-1%-S 00041B 00041B RES 1/4W 1% SMD 1206 7 R 1K2-1%-S 00042A R 22K-1%-S 00057B R 2R2-S R 3K9-1%-S 00048B R 470K-S 00073A R 470R-1%-S 00037B R 47K-1%-S 00061B R 4K7-1%-S 00049B R 68K-1%-S 00063B R 8K2-1%-S 00052B RL 40.31.12 07567 RV 10K-3266X 00807 SW SWITCH-8DIP SW VSS 0033.
AMPLIFIER INTERFACE SCH0128AR1 DESCRIPTION The interface board (SCH0128AR1) is used to connect the amplifier stages to the control board (SCH0122BR0) to allow to the microcontroller the reading of the RF and analogical parameters. It is simply composed of one temperature sensor, a voltage regulator, some passive componentes and a 10 pin connector J2. This connector has to be connected to the corresponding one of the SCH0122BR0 board.
COMPONENT LIST SCH0128AR1 Part Name/Number Description Qty. Comps.
SP500-48 SWITCHING POWER SUPPLY E0013 MAIN FEATURES - Universal AC input / Full range - Built-in active PFC function, PF>0.95 - Protections: Short circuit / Over load / Over voltage / Over temp. - Forced air cooling by built-in DC fan - Built-in cooling Fan ON-OFF control - Built-in remote sense function - Fixed switching frequency at 110kHz MECHANICAL SPECIFICATION 170 120 150 8 2 3 4 5 6 7 2-M3 L=16mm max. 50 2-M3 L=4mm max. L N (AC ) FG NC NC R.C.G. R.C.
TECHNICAL CHARACTERISTICS MODEL OUTPUT INPUT SP500-27 SP500-48 DC VOLTAGE 27V 48V RATED CURRENT 18A 10A CURRENT RANGE 0 ~ 18A 0 ~ 10A RATED POWER 486W 480W RIPPLE & NOISE (max.) Note 2 200mVp-p 300mVp-p VOLTAGE ADJ. RANGE 24 ~ 30V 41 ~ 56V VOLTAGE TOLERANCE Note 3 ± 1.0% ± 1.0% LINE REGULATION ± 0.5% ± 0.5% LOAD REGULATION ± 0.5% ± 0.5% SETUP, RISE, HOLD TIME 1500ms, 50ms, 20ms at full load VOLTAGE RANGE 88 ~ 264VAC FREQUENCY RANGE 47 ~ 63Hz POWER FACTOR PF>0.
DERATING CURVE 100 80 60 LOAD (%) 40 20 -10 0 10 20 30 AMBIENT TEMPERATURE ( 40 45 50 (HORIZONTAL) ) OUTPUT DERATING VS INPUT VOLTAGE 100 90 80 70 LOAD(%) 60 50 40 88 115 135 155 230 264 INPUT VOLTAGE (V) 60Hz 47
UHF TV OUTPUT FILTER IMD SUPPRESSOR 06604A 3 SECTION BANDPASS FILTER WITH 2 NOTCH ELEMENTS - COMB-LINE STRUCTURE, INDUCTIVE COUPLING IRISES; CONSTANT BANDWIDTH, VERY EASY TO TUNE - EXACT GENERALIZED CHEBISHEV DESIGN GIVING MAXIMUM SELECTIVITY AND MINIMUM GROUP DELAY VARIATION. SPECIFICATIONS Frequency Connectors Insertion loss Return loss Operating temperature Bandwidth Selectivity @V.C.-5.5/+11 Selectivity @V.C.-11/+16.5 Weight 48 470 - 860MHz N 0.55dB Typ. @ V.C.
TECHNICAL DESCRIPTION The output UHF filter is made up of a resonators bandpass filter and two notches. It can be regulated on all the channels of UHF TV band (470 - 8690MHz) and according to all world-wide standards (intercarrier 4.5 - 6.5MHz). The bandpass section is composed by the three middle resonators, while the two resonators apart are the notches. The filter is symmetrical, therefore the choice of lowest and highest notch is indifferent.
notches if it has to be moved and then the bandpass tunings. Execute the sequence in small steps aiming to improve the matching. SPECIFICATION OVER THE UHF BAND MEASURE Insertion loss @ V.C. < 0.65dB (Typ. 0.56) Return Loss (from V.C.-0.75 to S.C.+0.25) > 26dB Attenuation @ V.C.-INTERCARRIER > 25 Attenuation @ V.C.+INTERCARRIER > 20 Date D.T.
