LDMOS TV SOLID STATE AMPLIFIER AUTV/1500LD User’s manual 1
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Section 1 - Information Contents: 1.1 Description 1.
AUTV/1500LD TV AMPLIFIER 1.1 DESCRIPTION The AUTV/1500LD is an amplifier operating into Band IV-V for common amplification process of the Vision and Sound carriers. The amplifier has been designed to offer to the customer high performances, high reliability and greater simplicity in his operation and maintenance procedures. The amplifiers modules employ all solid state LDMOS technology in order to obtain high gain, wideband performances, very good linearity, reliability and high efficiency.
1.2 TECHNICAL CHARACTERISTICS RF SECTION Frequency range Output power Video/Sound power ratio Out stage technology Vision-Sound amplification I.M.D. (-8, -10, -16dB) Standards Spurious and harmonics level RF Output impedance RF Output connector 470 - 860MHz 1300W PEP 10/1 Solid State LDMOS Common Better than -54dB G, K, N In compliance with CCIR rec.
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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 and AGC socket connections 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.
When the apparatus is put within a combined system it is directly connected to the input splitting and output combining systems. Before fully powering 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.
PIN N° SIGNAL TYPE IN / OUT FUNCTION 1 GND - - 2 Digital Output 0V = Normal 5V = AGC Alarm 3 Digital Output 0V = Normal 5V = AGC Alarm 8 Analog Output FWD Power 9 Analog Output FWD Power AGC - DB9 Socket 2.5 PREVENTIVE MAINTENANCE To ensure maximum performance and minimum repair trouble, we strongly recommend you to follow the below stated headlines for preventive maintenance: 1. check antenna installation and ground connection at regular intervals; 2.
Front panel 5 1 LCD Display 2 Function keys 3 Status LEDs 4 RF Monitor connector 5 Main switch 6 RS232 Socket 2 1 6 3 4 DESCRIPTION 11
Rear panel 3 1 2 4 9 8 5 6 7 DESCRIPTION 12 1 Breaker 2 Power supply socket 3 Auxiliary socket 4 Fuse 5 RS485 Socket 6 AGC Socket 7 Telemeasure socket 8 RF Input connector 9 RF Output connector
Section 3 - Operation Contents: 3.1 Operation 3.2 Display 3.
3.1 OPERATION At startup, after initial image, the display shows the main screen with the RF powers as in Figure 1: Figure 1: Main screen 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, see Figure 2, 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.
Figure 4: Main menu 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 in Figure 5. To go back from a submenu to the previous menu, press the ESC key. If the ESC key is pressed in the main menu, the RF powers screen is accessed.
- RF Powers This is the main screen showing the RF powers of the amplifier: forward power, reflected power, unbalances, if any. For forward power a level bar is displayed. See an example in Figure 1. - Power Supply This screen shows all the signals coming from two power supply. To check the next (previous) power supply press the UP (DOWN) key. For each power supply, the voltage, the absorbed current and the status (ON or OFF) are shown.
In case of alarm, the value of the measure which caused the alarm is saved into the log. In case of alarm still existing after five turning-on attempts, the parameter is marked as FAILED. Table 2 is the list of all the events which can be logged.
- RMS/Peak The control board can monitor both the RMS and peak powers, the first used in digital systems. The menu entry Settings RMS/Peak allows to choose the power to be displayed and monitored. This menu is present only in certain amplifiers. - Date/Time This screen allows to set the current date and time. The setting is changed by pressing the arrow keys, then pressing the RET key to move to the following value and eventually save the changes.
- Frequency (only for some Amplifiers) The forward and reflected RF powers is measured by means of a directional coupler. In order to compensate for the effect due to the sampling made by the coupler, it is possible to set the frequency by menu entry Settings Frequency. The setting can be changed by pressing the arrow keys. The changes made are saved by pressing the RET key or discarded pressing the ESC key. Set the video carrier frequency.
menu item Settings Interlock. When it is enabled, the status bar shows the lock symbol (see Figure 3), which is close if the interlock chain is closed (no alarm) or open if it is open (alarm). - Firmware Release The menu entry Settings Firmware Release allows to display the firmware version number and the hardware release of the amplifier. - Serial Number The menu entry Settings Serial Number allows to display the serial number of the apparatus.
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Section 4 - Diagram Contents: - Cable diagram - MTF0070CR0 RF Amplifier module Cable Diagram - MTF0070CR0 RF Amplifier module Connections Diagram - MTF0070CR0 Amplifier module Component list - SCH0192AR0 (200W UHF LDMOS Amplifier Module) - SCH0221AR1 (Amplifier Interface) - SCH0223AR1 (Control Board and Display) - SCH0265AR0 (Mains Distribution Board) - SCH0288AR1 (Interface Board) - E0012 (SP500-27 Switching power supply) 23
Component list MTF0070CR0 Amplifier module Part Name Code Description Qty 00001 01041D 00221B 03207 SCH0192AR0 SCH0221AR0 SCH0248AR0 SCH0249AR0 SCH0250AR0 SCH0251AR0 SCH0252AR0 PN1091A 02402 02512 01400 01408 DET0726 DET0727 DET0728 DET0729 DET0730 DET0732 DET0734 DET0736 DET0807 DET0810 DET0811 DET0812 DET0819 DET0828 DET0839 08502 08527 03017 PN0998A 0Ω 1206 SMD RESISTOR 1nF 1206 2% SMD CAPACITOR 75Ω 1206 1% SMD RESISTOR HSMS-2802*L31 DIODE 200W UHF LDMOS AMPLIFIER MODULE AMPLIFIER INTERFACE 8 WAY W
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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.
SCH0192AR0 Component layout 33
SCH0192AR0 COMPONENT LIST 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.
AMPLIFIER INTERFACE BOARD SCH0221AR0 SCH0221AR0 Component layout SCH0221AR0 COMPONENT LIST Part Name/Number Description Qty. Comps. 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 10K-S 00053A R 220R-S 00033A R 270R-S 00034A R 4K7-S 00049A TR BC856 03455 01065A CERAMIC CAPACITOR 01795B ELETT.
CONTROL BOARD AND DISPLAY SCH0223AR1 DESCRIPTION The Control Board SCH0223AR1 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. Figure 1 shows the block diagram.
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).
RF AMPLIFICATION The J3 connector interfaces the control board with the RF amplification section. Through this connector the 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
FIRMWARE UPDATE 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 “...
SCH0223AR1 Top layer Component layout 45
SCH0223AR1 Bottom layer Component layout 46
SCH0223AR1 COMPONENT LIST Part Name/Number Description Qty. Comps.
Part Name/Number Description Qty. Comps. IND MS85 10uH-S 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 02739-40-41 J PAN8 02716 JU JUMP2 02739-02742 JU JUMP3 02707-02742 R 100K-1%-S 00065B R 100R-1%-S 00029D 04948 INDUCTOR 2.
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.
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 POL 02706 PCB FEMALE CONNECTOR POL 00001 RES 1/4W 5% SMD 1206 16 8 4 4 16 R 10K-S 00053A 00053A RES 1/4W 5% SMD 1206 16 R 1206 N. M. N. M. RES 1/4W 5% SMD 12 16 RV 3266W N. M. N. M.
SP500-27 SWITCHING POWER SUPPLY E0012 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 ASSIGNMENT AC/L 7 R.C. AC/N 8 +S 3 FG 9 ~ 11 DC OUTPUT +V 4, 5 NC 12 ~ 14 DC OUTPUT -V 6 R.C.G. 15 -S 2-M3 L=16mm max.
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 53
