_______________________________________________________________________________________________ Section 4 - Diagram Contents: - Cable diagram - MTF0077AR0 Amplifier module - Component list - SCH0192AR0 (200W UHF LDMOS Amplifier module) - SCH0223AR1 (Control board and display) - SCH0259AR0 (RF Amplifier interface) - SCH0265AR0 (Mains distribution board) - SCH0288AR1 (Interface board) - E0012 (SP500-27-DE2 Switching power supply) 31
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Component list MTF0077AR0 Amplifier module Part Name Code Description Qty 00441 01400 02402 SCH0192AR0 00424 03207 00028A 01041D 08527 08502 CAV092 DET0732 DET0959 02520 02512 DET0868 PN1083A PN1091A DET0839 DET0810 00029D 00221B 01408 DET0811 DET0812 00001 PN1077A PN1120A PN1118A PN1066A PN1080A DET0960 DET0961 00383 00395 00399 00403 DET0901 DET0902 DET0903 DET0803 DET0905 DET0906 DET0907 DET0908 TERMINAZIONE 50W 500W 32-1123-50-5 C. PAS. 2499-003-X5U0-102M 7/16 FEMMINA ANIM. FILET. cod.
Part Name Code Description Qty 08503A 08521 DET0904 CABLE RG302 75W CAVO RG179 BU 75W DET0904R0 SPONDINA LAT. DX 1kW UHF 6 MOD.
Component list APT148B - AUTV/1000LD Part Name Code Description Qty APT148A 06659 RO156F Z0500 DET0462 PAN0082 PAN0080 PAN0081 CSS5011 CON0093 CMS6006 02502 08504 02009 07595 07595A Z0114 DET0434 DET0564 DET0565 02450 02458 08515A 02410 07959B 07596 DET0609 R0031 D0101 D0100 DET0671 AMPLIFICATORE UHF 1000W LDMOS MEANWELL BANDPASS FILTER CL3N60C-AEE IV/VBd RACK 20U 565x1000 CON COPER. FORATO TAV. 1081RF GUIDA RACK 3000W P. 2328 ZN DET0462R0 BARRA x RACK SOSTEGNO PCAV ZN PAN0082R0 PANN. FRONT.
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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 50W W 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 41
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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 100KW PTH NTC 100KW PTH DG419DY DG419DY 15V SMD ZENER DIODE 15V SMD ZENER DIODE 6.8V SMD ZENER DIODE 6.
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 ...
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COMPONENT LIST SCH0223AR1 Part Name/Number Description Qty. Comps.
Part Name/Number Description Qty. Comps. IND MS85 10uH-S IND T100uH-1.
RF AMPLIFIER INTERFACE SCH0259AR0 Component layout SCH0259AR0 COMPONENT LIST SCH0259AR0 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 220R-S 00033A R 22K-S 00057A R 270R-S 00034A R 4K7-S 00049A TR BC856 03455 01065A CERAMIC COND 01795B ELETT. COND.
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MAINS DISTRIBUTION BOARD SCH0265AR0 Component layout SCH0265AR0 COMPONENT LIST SCH0265AR0 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.
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INTERFACE BOARD SCH0288AR1 Component layout SCH0288AR1 COMPONENT LIST SCH0288AR1 Part Name/Number Description Qty. Comps.
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SP500-27-DI SWITCHING POWER SUPPLY E0012 SPECIFICATION MODEL SP-500-27 (E0012 Code) SP-500-48 (E0013 Code) DC Output Voltage Output Rated Current Output Current Range Ripple & Noise (p-p) DC Output Power Efficiency DC Voltage Adj. Over V. Protection Input Voltage Range Input Frequency Power Factor Overload Protection 27Vdc 18A 0-18A 200mVp-p 486W 87% 24-30V 31V-36.5V 88-264Vac 47-63Hz 0.95/100-240Vac 105%-135% Type: Foldback current limiting Recovery: Auto > =70°C Output Shutdown Temp.
UHF BANDPASS FILTER CL3N60C 1kW, 3 Sections + 2 Notches Code 06659 FEATURES - UHF 1kW analog TV output filter - 3 bandpass resonators and 2 notches - Foreshorten in-line combline structure - Iris couplings with fine bandwidth regulation - Phase regulation between bandpass and notches - 3D Electromagnetic CAD - Low loss (Typ. 0.35dB @ V.C. Ch.
TECHNICAL DESCRIPTION The output filter mod. CL3NL15 is made up by a band-pass section with 3 resonators and two notch resonators. It may be adjusted on all channels of the YHF TV band (470 - 860MHz) and for any world standard (intercarrier 4.5 - 6.5MHz). The band-pass section is made up by the group of the three resonators, while the two separated resonators are the notches. The filter is symmetrical, as such any notch, upper or lower, can be chosen without any difference.
3. Tune the band-pass section on the desired channel and load input and output correctly until an optimal response is obtained. At this stage the tuning of the two notches must be kept distant from each other. Adjust the band width to -27dB at the edges of the screen (es. std. B/G: BW (-27dB) = 27,5MHz). The input and output couplings may affect the tuning of the resonators, as such it takes adjusting them at the same time in little steps. 4. Tune the two notches bringing them to the frequencies P.V.
SAMPLE FREQUENCY RESPONSE DIAGRAM 73
