LDMOS UHF SERIES MEDIUM POWER TV AMPLIFIER User’s manual 83
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Section 1 - Information Contents: 1.1 Description 1.2 Main features 1.3 Technical characteristics 1.4 Front panel 1.
MEDIUM POWER TV AMPLIFIER SERIES 1.1 DESCRIPTION The amplifier belongs to the Medium Power Amplifier products family of Television Amplifiers fully in solid state LDMOS technology. These TV Amplifiers operate in the UHF Band with Common amplification process (separate amplification available) of the Video and Audio carriers. This Amplifier family has been designed to offer to the customer high performances, high reliability and greater simplicity in its operation and maintenance procedures.
1.3 TECHNICAL CHARACTERISTICS RF SECTION Analog Operation Frequency Range ........................................................................................................................................................... UHF Output Power (±0.5dB) ............................................................................................................................................... 1300W Amplification Class ......................................................................................
PROTECTIONS Output Forward Power Output Reflected Power Unbalance Power RF Modules Current Power Supply Voltage PROTECTIONS Forward Power (Analogue) ......................................................................................................................................... 1500W Reflected Power (Analogue) ......................................................................................................................................... 150W Forward Power (DVB-T) ...........................
1.4 FRONT PANEL 1 1. Function keys 2. LCD Graphic Display 3. Status LEDs 4. RS232 Socket 5. RF Monitor Connector 6.
1.6 REAR PANEL 1 2 3 41 42 43 5 6 7 8 9 FUSE FUSE FUSE 1. Breaker 2. AC 220V OUT Socket 3. AC 400V IN Socket 41. FAN 3.15A Fuse 42. CONTROL BOARD 1A Fuse 43. EXCITER 4/8A Fuse 5. RF IN Connector 6. RS485 Socket 7. EXCITER Socket 8. TELEMEASURES Socket 9.
Section 2 - Installation Contents: 2.1 Operating environment 2.2 First installation 2.3 Connection with VEGA Transmitter 2.4 Stand-alone Amplifier configuration in Dual Drive version 2.5 Slave multi-Amplifier configuration with Amplifier Control 2.6 Stand-alone Amplifier configuration with Elettronika RCU 2.
2.1 OPERATING ENVIRONMENT You can install the equipment 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. Do not locate the equipment directly above a hot piece of device. The upper lid can be dismounted to allow an easy internal access. The equipment is designed with a modular design, that is each circuit is realized inside different modules or boards.
When the equipment is put within a combined system it is directly connected to the input splitting and output combining systems. Before fully powering the equipment, 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.
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2.6 STAND-ALONE AMPLIFIER CONFIGURATION WITH ELETTRONIKA RCU AC 400V IN RF IN RS485 AGC TELEMEASURES BREAKER AC 200V OUT RF OUT 2.
Section 3 - Operation Contents: 3.1 Operation 3.2 Display 3.3 Menus 3.
3.1 OPERATION At startup, after initial image, the display shows the main screen with the RF powers as below: The user may turn on and off the amplifier by means of the switch on the front panel. The control board turns on all the power supplies, the exciter (if any), and internal cooling fans.
3.2 DISPLAY The Control Board is provided with a modern pixels graphic display with blue background. Normally it always shows a title bar (on the top line) and a status bar (on the bottom line). The ‘Title bar’, shows the name of the amplifier (TV Amplifier) and the current time. If the amplifier is a single unit coupled externally with other units in a high power transmitter, the title bar shows the amplifier number (slave address) too.
The display only shows three items at a time: all the items can be scrolled by the UP and DOWN arrow keys. Any item can be chosen by selecting it and pressing the RET key. Menu entries with an arrow on the right open sub-menus when chosen. Thus there is a hierarchical structure as below. To go back from a sub-menu to the previous menu, press the ESC key. If the ESC key is pressed in the main menu, the RF powers screen is accessed.
Log/Alarms The control board is provided with an external EEPROM and a clock. Any alarm or switching event with the time at which it occurred is saved in the EEPROM. The Log/ Alarms sub-menu allows to manage this log. It is possible to see the events stored in the log by selecting Log/Alarms J View Log/ Alarms. All events can be scrolled by pressing the UP and DOWN keys. For example, the event shown in Figure 7 is the turning on of the amplifier by means of the local switch.
working (i. e. there is at least one power supply working). The menu entry Working Timer J View Timer allows to check the hours for which the timer has been enabled. Working Timer J Timer Reset resets the timer. Thresholds This is a screen showing the alarm threshold of each signals monitored by the control board. The list can be scrolled by means of the UP and DOWN keys. RMS/Peak The control board can monitor both the RMS and peak powers, the first used in digital systems.
alone mode or set a slave address by means of the UP and DOWN arrow keys. The changes made are saved by pressing the RET key or discarded pressing the ESC key. Remote The amplifier may be controlled either locally, by means of the keys and display, or remotely. There are three possibilities for remote control: - using a direct serial connection between amplifier RS232 connector and a PC RS232; - using the remote control device manufactured by Elettronika S.r.l.
3.4 FIRMWARE UPGRADE The microcontroller is provided with a built-in Flash memory containing the firmware. The firmware can be updated with a later version without removing the apparatus from the rack and/or replacing the chip. To upgrade it, connect a PC to the RS232 socket on the front panel of the apparatus by means of a cable DB9 male - DB9 female (pin-to-pin). Launch on the PC the EKAFlash application, select the serial port in use on the PC, choose the update file by pressing the “...
Section 4 - Diagram Contents: - APT144 AUTV/1500LD Cable diagrams - APT144CM AUTV/1500LD Component list - Modules description 105
Vm COM 8 V+ V- N T1 T2 T3 S1 S2 S3 R1 R2 R3 8 L N J7 COM Im V+ V- 7 L N SP500-27/48 SWITCHING POWER SUPPLY COM Im V+ V- 6 L N SP500-27/48 SWITCHING POWER SUPPLY J6 COM Im V+ V- 5 L N SP500-27/48 SWITCHING POWER SUPPLY COM Im V+ V- 4 L N SP500-27/48 SWITCHING POWER SUPPLY J2 9 10 2 J3 Im 2 J3 9 10 1 V+ V- 3 L N SP500-27/48 SWITCHING POWER SUPPLY COM J4 SCH0288A INTERFACE BOARD J1 1 J6 U2 TP10 L (EQUIPOTENTIAL) Vm J5 2 J6 9 10 1 V+ V- 2 L N SP500-
TP5 TP4 400VAC 1 = NC TP9 5=T 4=S 3=R 2=N TP10 T1 T2 T3 S1 S2 S3 R1 R2 R3 N Im 8 V+ V- L N COM Im V+ V- 7 L N SP500-27/48 SWITCHING POWER SUPPLY COM Im V+ V- 6 L N SP500-27/48 SWITCHING POWER SUPPLY J6 COM Im V+ V- 5 L N SP500-27/48 SWITCHING POWER SUPPLY COM Im V+ V- 4 L N SP500-27/48 SWITCHING POWER SUPPLY J3 2 J3 9 10 1 V+ V- 3 L N SP500-27/48 SWITCHING POWER SUPPLY Im J4 J5 2 J6 9 10 1 V+ V- 2 L N SP500-27/48 SWITCHING POWER SUPPLY J8 POWER SUPP
Component list APT144CM Elettronika Code Description Qty 00221 00664 01041 01077A 02228 02502 02695 02699 02700 02830 02876 02877 02893 02894 05064 07524A 07527 07541 07605C 07605D 07605F 07925 08503 09419 C0205 CON0245 CON0249 CON0276 CON0277 CON0280 DET0314 DET0575 DET0772 DET0798 DET0996 DET1022 DET1054I DET1185 E0012 FUS1A FUS3A FUS5A MTF0070CR0 PAN0074 PN1114A 75Ω 1/4W RESISTOR LM35DT THERMAL SENSOR 1nF 50V CERAMIC CAPACITOR 1uF 100V POL.
Elettronika Code Description Qty R0012 SCH0223AR1 SCH0265AR0 SCH0288AR1 V0760 V0962 Z0021 Z0081 Z0673 18mm DIAMETER WHEEL CONTROL BOARD AND DISPLAY MAINS DISTRIBUTION BOARD POWER SUPPLY INTERFACE BOARD BLACK PLASTIC TAP TERMINAL BLOCK MECHANICAL DETAIL MECHANICAL DETAIL COVER 8 1 1 1 1 3 2 1 1 Page 2/2 109
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CONTROL BOARD SCH0223AR1 DESCRIPTION The Control Board SCH0223A manages the operational logic of the amplifier: switching on and off, power supply and fans, alarms and protections, remote control, human-machine interface. All of that is performed by a modern and powerful 16 bit micro-controller, which is the main part of the board.
It can be seen that the micro-controller is the heart of the control system, to which the various peripherals (power supply, serial ports, telemeasure socket, AGC port, RF amplifier module, ROM, clock, display and keys) are interfaced. - Power Supply The board is powered with a continuous +24V voltage applied on the J14 connector. From that the +5V voltage, powering the most of the chips (micro-controller, operational amplifiers, display, etc.) is derived by means of a switching converter (see IC19).
micro-controller acquires the forward and reflected powers, unbalancing (if any), and temperature of the critic amplification area. It also allows to inhibit the transistors in case of reflected power alarm, by means of a totally hardware, thus extremely fast protection. Depending on the apparatus, this connector may also allow to enable or disable the cooling fans of the critic area.
TELEMEASURES The J9 telemeasure connector (10 pins socket) is directly wired on a DB9 female connector placed on the rear panel. There are input and output digital lines (TTL level) and analog output lines on this connector, which are used to monitor and control the amplifier by means of a general-purpose remote control system.
level of the interlock signal becomes high (this line has a pull-up towards the +5V power supply voltage as well) and the interlock protection activates switching off the amplifier. Note that in case the interlock protection is not used, the pin 4 of the DB9 telemeasure connector and the earth pin (pin 5) must be short circuited. Otherwise it is possible to disable the monitoring of the interlock chain from menu (see user manual).
PIN N° ON DB9 PIN N° ON J10 TYPE DIRECTION 1 1 - - 2 3 Digital Output AGC Alarm 0V = Alarm 5V = Normal 3 5 Digital Output AGC Alarm 0V = Alarm 5V = Normal 4 7 - - Not used 5 9 - - Not used 6 2 - - Not used 7 4 - - Nout used 8 6 Analog Output Forward power 9 8 Analog Output Forward power DESCRIPTION Ground Table 4: Description of the AGC connector RS232 The DB9 female connector on the front panel is an external communication RS232 serial port, through which a
SCH0223AR1 Top layer Component layout 117
SCH0223AR1 Bottom layer Component layout 118
SCH0223AR1 COMPONENT LIST Part Name/Number Description Qty. Comps.
Part Name/Number Description IND T100uH-1.8A 4958 J CON HD515V/05-4PVE J DB9_F-0° LT J FC-10P 02697-02699 J FC-16P 02701-02700 J PAN2 02739 J PAN2 02739-40-41 J PAN8 02716 JU JUMP2 02739-02742 JU JUMP3 02707-02742 R 100K-1%-S 00065B R 100R-1%-S 00029D 04958 TOROIDAL-STORAGE 1 02881+02882 PANDUIT PCB CON. 1 02794 PCB CONNECTOR DB9 1 02697+02699 PCB CONNECTOR 8 02701+02700 PCB CONNECTOR 1 02739 PCB CONNECTOR 2 02739+02740+02741 PCB CONNEC.
MAINS DISTRIBUTION BOARD SCH0265AR0 SCH0265AR0 Component layout SCH0265AR0 COMPONENT LIST Part Name/Number Description Qty. Comps. CC 2nF2 2kV 01045A CNV AC-DC ATC-12S D 1N4148 03001 DL LEDG3 03053 J CON HD515V/05-4PVE J CON HD515V/05-5PVE R 2K7 0046 RL 40.31.24 01045A CERAMIC CAPACITOR E0037 AC DC CONVERTER 03001 DIODE 03053 GREEN LED DIODE 3mm 02881+02882 PANDUIT PCB CON. 02895+02896 PANDUIT PCB CON.
POWER SUPPLY INTERFACE BOARD SCH0288AR1 SCH0288AR1 Component layout SCH0288AR1 COMPONENT LIST Part Name/Number Description Qty. Comps. CC 1nF-S 01096 DZ 5V1-S 03128 J FC-10P 02697-02699 J FC-10P PCB FEMALE R 0R0-S 00001 01096 SMD 1206 CAPACITOR 03128 SMD ZENER DIODE 02697+02699 PCB CONNECTOR 02706 PCB FEM. CONNECTOR 00001 RES 1/4W 5% SMD 1206 16 8 4 4 16 R 100K-1%-S 00065B R 1206 N. M. 00065B RES 1/4W 1% SMD 1206 N. M. RES 1/4W 5% SMD 1206 8 16 R 8K2-1%-S 00052B RV 3266W N. M.
LDMOS UHF AMPLIFIER MODULE MTF0070CR0 DESCRIPTION The MTF0070C is the RF Amplifier module of the AUTV/1500LD based on LDMOS technology. The RF Amplifier module is composed by eight broadband amplifier boards (SCH0192A) coupled together by means of Wilkinson combiners, driven by means another amplifier board.
RF INPUT MONITOR FWD RF IN GATE DRIVER (SCH0192A) RF OUT 4 WAY WILKINSON DIVIDER 4 WAY WILKINSON DIVIDER 124 GATE GATE RF OUT 8 SCH0192A RF IN 8 REF FWD SCH0223A CONTROL BOARD TEMP SCH0221A INTERFACE BOARD RF OUT 7 SCH0192A RF OUT 5 SCH0192A RF IN 5 RF IN 7 RF OUT 4 SCH0192A RF IN 4 RF OUT 6 RF OUT 3 SCH0192A RF IN 3 SCH0192A RF OUT 2 SCH0192A RF IN 2 RF IN 6 RF OUT 1 SCH0192A RF IN 1 FWD REF TEMP LCD DISPLAY TEMPERATURE SENSOR 8 WAY WILKINSON COMBINER 2 WAY WILKI
PN1091A DIRECTIONAL COUPLER T13 RF T6 SCH0192A RF AMPLIFIER BOARD #6 T7 SCH0192A RF AMPLIFIER BOARD #7 T8 SCH0192A RF AMPLIFIER BOARD #8 RF 32-1037 FLORIDA RF 32-1037 FLORIDA PN1010A HSMS2802 T15 1nF PN1089A SCH0192A RF AMPLIFIER BOARD #5 FLORIDA RF 32-1037 T5 FLORIDA T4 RF SCH0192A RF AMPLIFIER BOARD #4 32-1037 T3 RF SCH0192A RF AMPLIFIER BOARD #3 32-1037 T2 FLORIDA SCH0192A RF AMPLIFIER BOARD #2 32-1037 T1 FLORIDA SCH0192A RF AMPLIFIER BOARD #1 T12 82Ω FLORIDA RF
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.
CALIBRATION PROCEDURE - Technical characteristics Power supply voltage 32V (± 2%) Polarisation current 1.0 cold for each device (2A total), ± 0.1A Gain for low signal Not less than 13dB in the 470-860MHz band (± 1dB) Compare to the typical curve eclosed - Adjustment procedure Polarisation current calibration 32V stabilised power supply 10A amperometer Gain curve Network analyser - Adjustment points description R7-R8 (Trimmers) Adjust the current absorbed in stand-by (1.
Solder a wire STEP 4: Fastening of the LDMOS transistors: after properly cleaning the plate surface, smear a thin layer of silicone fat on the lower side of the flange of the MOSFETs, fasten them to the heat sink and solder the gate first, then the drain. Solder the two 13pF (ATC) chip capacitors and above them the two 1-5pF capacitive trimmers, between the two pair of gates, as shown by the mounting plan. STEP 5: Connect serially a c.c.
SCH0192AR0 Component layout 129
SCH0192AR0 COMPONENT LIST Elettronika Code Description Manufacturer, Mfr. Code 00045A 00042A 00800 00056B 00075A 00001 00432 00049A 00012A 00396 01807B 01795 01145 01065H 01135 01065G 01613A 2K2 1206 5% 1/4W RESISTOR 1K2 1206 1% 1/4W RESISTOR 50K 3.8" SQUARE TRIMMER 18K 1206 5% 1/4W RESISTOR 680K 1206 5% 1/4W RESISTOR 0R 1206 RESISTOR 50 OHM 60W TERMINATION 4K7 1206 1% 1/4W RESISTOR 3R9 1206 5% 1/4W RESISTOR 1K0 2512 5% 1W RESISTOR 470uF 50V ELECTROLITIC CAPACITOR 100uF PTH 50V ELET. VERT. CAPACIT.
AMPLIFIER INTERFACE BOARD SCH0221AR0 SCH0221AR0 Component layout SCH0221AR0 COMPONENT LIST Part Name/Number Description Qty. CC 100nFAVX 01065A CE 100uF100V CE 100uF50V 01795 CE 10uF35V-S 01778A D 1N4007 03009 D 6CWQ10FN IC LM317HV J FC-16P 02701-02700 J SCREWCONN2 02853 J SCREWCONN3 02860 J TESTP1.3mm 07913 JU JUMP2 02739-02742 JU JUMP3 02707-02742 R 0R33-1W-S R 100K-S 00065A R 220R-S 00033A R 22K-S 00057A R 270R-S 00034A R 4K7-S 00049A TR BC856 03455 01065A CERAMIC CAPACITOR 4 01795B ELET.
SP500-27/48 DE2 SWITCHING POWER SUPPLY E0012 - 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.
