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Electronika LDMOS UHF SERIES User Manual Download Page 29

119

Figure 1: Simplified block diagram of the control and display board

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.

Summary of Contents for LDMOS UHF SERIES

Page 1: ...91 LDMOS UHF SERIES MEDIUM POWER TV AMPLIFIER User s manual ...

Page 2: ...92 This page is intentionally blank ...

Page 3: ...93 Section 1 Information Contents 1 1 Description 1 2 Main Features 1 3 Technical characteristics 1 4 Front panel 1 5 Rear panel Rear connections ...

Page 4: ...dard DVB T DVB H DMB T ATSC It is only necessary to replace the modulator and the RF output band pass filter alltheothercomponentsareusedwithoutanychange Thecoolingsystemisfullycontainedintotheamplifier anditisbasedonforcedairflow Apowerfulandvery low acoustic noise blower is used Afront panel air dust filter is available sized in order to enable easy replacement The user interface is based on a g...

Page 5: ...ntETSIEN300744 ATSC Symbol Rate 10 76MBaud s Compliant toATSC Doc A 53 ATSCSNR 27dBRMS ATSC ShouldersAttenuation After simple mask cavity filter ref total output power 46dBRMS ATSC Output Spectrum Compliant toATSC Doc A 64 REMOTECONTROLSECTION Parallel Interface ON OFF Alarms Interlock Serial Interface RS232 or RS485 Selectable METERING Output Forward Power Peak or RMS Output Reflected Power Peak ...

Page 6: ... ATSC 150W Temperature 75 C IDC 18A VDC Min10V Max33 5V GENERAL Power Supply Voltage 90 260V Power Supply Frequency 50 60Hz Power Factor 0 98 Analog Power Consumption Black 3 45kVA Digital Power Consumption DVB T 2 2kVA Digital Power Consumption ATSC 2 5kVA Housing Amplifier Rack 6U 20U Weight Amplifier Rack 63kg 175kg Airflow From 330m3 h to 500m3 h Temperature 5 Cto 45 C Options Non critical mas...

Page 7: ...NEL 2 3 5 1 1 Function keys 2 LCDGraphicDisplay 3 Status LEDs 4 RS232 Socket 5 RF Monitor Connector 6 MainSwitch 6 4 RS232 for connection to PC with ERCoS software and for firmware upgrade Pin 2 TX Pin 3 RX Pin 5 GND ...

Page 8: ... Pin 2 REF power Analog out Pin 3 Temperature Digital out Pin 4 Interlock Digital in Pin 5 GND Pin 6 7 Free contact Digital out Closed when Alarm Pin 8 0V ON 5V Normal Digital in Pin 9 0V OFF 5V Normal Digital in EXCITER for connection to Driver Module Pin 1 GND Pin 2 0V Normal 5V AGC Alarm Digital out Pin 3 0V Normal 5V AGC Alarm Digital out Pin 8 FWD power Analog out Pin 9 REF power Analog out R...

Page 9: ... 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 7 Stand aloneAmplifier configuration with direct PC connection ...

Page 10: ...onoftheequipmentisimportantformaximumperformanceandreliability Antennaandearth connectionsmustbeinstalledwiththegreatestcare Theequipmentadjustmentisn tneed becausetheunitis completelyadjustedbyourtechnicalstaff 1 Connect Power Supply cable of the Exciter to theAuxiliary Socket on the rear panel of theAmplifier 2 connectthePowerSupplycableoftheAmplifiertotheelectricnetwork 230VACMonophaseor400VAC ...

Page 11: ...orking 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 watts might be shown as Reflected Power 2 3 CONNECTION WITH VEGA TV TRANSMITTER AGC 1 2 8 5 8 4 TV AMPLIFIER VEGA BREAKER AC 200V OUT RS485 TELEMEASURES AC 400V IN RF OUT RF IN ...

Page 12: ...O OUT AUX AUX MAIN GND LEFT OUT AUX LEFT MAIN LEFT OUT IN RIGHT OUT AUX RIGHT MAIN OUT RIGHT IN IN AUX MAIN IN 19kHz OUT DIRECT REMOTE IN RF AUX IN RF OUT RF MAIN IN AUX CTRL RS232 485 REMOTE MAIN CTRL BREAKER AC 200V OUT AC 400V IN RF OUT AGC RS485 TELEMEASURES RF IN To ANTENNA ...

Page 13: ...3 2 5 SLAVE MULTI AMPLIFIER CONFIGURATIONWITHAMPLIFIER CONTROL BREAKER AC 200V OUT AC 400V IN RF OUT AGC RS485 TELEMEASURES 2 3 5 2 3 5 AMPLIFIER CONTROL AMPLIFIER RF IN To COMBINER 7 8 7 8 From SPLITTER ...

Page 14: ...4 2 7 STAND ALONEAMPLIFIER CONFIGURATION WITH DIRECT PC CONNECTION 2 6 STAND ALONEAMPLIFIER CONFIGURATIONWITH ELETTRONIKARCU SERIAL PORT BREAKER AC 200V OUT AC 400V IN RF OUT AGC RS485 TELEMEASURES RF IN ...

Page 15: ...105 Section 3 Operation Contents 3 1 Operation 3 2 Display 3 3 Menus 3 4 Firmware upgrade ...

Page 16: ...oraryproblem to trigger a definitive protection status the failed block is turned on again after some seconds for up to five times Ifitgoesbeyondtheprotectionthresholdformorethanfivetimes itisdeclaredasFAILEDanditwill nolongerbeturnedon Inthiscase theamplifierwillhavetobeturnedoffmanuallybymeansoftheswitchon thefrontpanel thenturnedonagainafterperformingtheneededmaintenance On the front panel ther...

Page 17: ...aseofalarm Itblinksiftherehasbeenanalarmwhichhasended but has not yet been seen by the user It stops blinking once the Log has been checked The interlock symbol isdisplayedonlywhenthisfunctionisenabled Itmaybeeitheracloselock whenthereisnoalarm interlock chain closed or an open lock in case of alarm interlock chain open Since the status bar is always showed on the display regardless of the screen ...

Page 18: ...WN key Foreachpowersupply thevoltage the absorbed current and the status ON or OFF are shown Thedisplayonlyshowsthreeitemsatatime alltheitemscanbescrolledbytheUPandDOWNarrowkeys AnyitemcanbechosenbyselectingitandpressingtheRETkey Menu entries with an arrow on the right opensub menuswhenchosen Thusthereisahierarchicalstructureasbelow Togobackfromasub menu to the previous menu press the ESC key If t...

Page 19: ... parameter is marked as FAILED The table below is the list of all the events which can be logged EVENT DESCRIPTION Local ON Amplifier turned on by means of the local switch Local OFF Amplifier turned off by means of the local switch Remote ON Amplifier turned on remotely Remote OFF Amplifier turned off remotely Interlock open Interlock chain open Interlock closed Interlock chain closed Power Suppl...

Page 20: ...lay such hasbacklight contrastandscreensaver Thebacklightandthecontrastaresetbymeans of the UP and DOWN arrow keys The changes made are saved by pressing the RET key or discarded pressing the ESC key With SettingsJDisplayJScreensaver you can set an interval time after which display backlight is turned off When display backlight is off press any key to switch it on Frequency only for some Amplifier...

Page 21: ...mote control choosing menu item SettingsJRemote When remote control is enabled the yellow REMOTE LED on the front panel is lit Interlock One of the pins of the telemeasure connector located on the rear panel is used for the interlock alarm It is an input line which turns off the amplifier in case of alarm The interlockcheckcanbeenabledordisabledusingmenuitemSettingsJInterlock When itisenabled thes...

Page 22: ...32 socket on the front panel of the apparatus by means of a cable DB9 male DB9 female pin to pin LaunchonthePCtheEKAFlashapplication selecttheserialportinuseonthePC choosetheupdatefileby pressing the key and click on Download button Eventually turnofftheamplifierfromthemainswitchandthenturnitonagain Theupgradeofthefirmware beginsontheEKAFlashwindow Thefigurebelowshowsthiswindowwhileafirmwareisbein...

Page 23: ...113 Section 4 Diagram Contents APT144 AUTV 1500LD Cable diagrams APT144C_APT144CM AUTV 1500LD Component list APT144DM_APT144DM DIG AUTV 1500LD Component list Modules description ...

Page 24: ...11 U10 U9 J4 J2 9 J1 1 J3 9 10 2 1 10 2 J7 J5 J6 9 1 10 9 2 1 J8 10 2 MAIN SWITCH SCH0288A INTERFACE BOARD J3 J6 J1 J8 J12 POWER SUPPLY 1 POWER SUPPLY 2 POWER SUPPLY 4 POWER SUPPLY 3 RF MONITOR 4 V L N V 5V V L N V V L N V N L V SWITCHING SP500 27 48 POWER SUPPLY 6 Im COM R C SP500 27 48 8 V V L N POWER SUPPLY SWITCHING Vm Im POWER SUPPLY SP500 27 48 7 R C Vm Im COM SWITCHING Vm SWITCHING POWER SU...

Page 25: ...6 TP7 TP10 TP8 TP9 J3 J7 J6 J19 TEMP 5V TEMP 5V J21 J3 J2 J9 J10 J11 AUXILIARY SOCKET 1A 5A J1 G D L N F J2 24V GND MAIN SWITCH 1 J14 2 3 4 J15 J6 J4 J2 9 J1 1 J3 9 10 2 1 10 2 J1 J7 J5 SCH0288A J6 9 1 10 9 2 1 J8 10 2 J8 J12 1 NC 400VAC 3 R 4 S 5 T 2 N N R S T U21 U19 U19 U21 U9 U10 U11 U8 U7 U5 U6 U3 U4 U1 U2 U14 U14 1 2 4 3 8 7 6 5 8 7 6 3 4 5 1 2 U11 U10 U9 T1 T2 T3 S1 S2 R1 R2 S3 R3 N N N7 N6...

Page 26: ...07605F GRIDFAN 6 07925 PVCPROTECTION 1 08503 RG30350WTEFLONCABLE 1 20 09419 PN419 APRINTEDCIRCUITBOARD 1 CON0245 CON0245R1MECHANICALDETAIL 1 CON0249 CON0249R0MECHANICALDETAIL 1 CON0276 CON0276R3MECHANICALDETAIL 1 CON0277 CON0277R3MECHANICALDETAIL 1 CON0280 CON0280R2MECHANICALDETAIL 1 C0205 MULTIPOLESWIRE 3 00 DET0516 DET0516R0MECHANICALDETAIL 1 DET0575 DET0575R1MECHANICALDETAIL 8 DET0772 DET0772R0...

Page 27: ...2 2 SCH0223AR1 CONTROLBOARDANDDISPLAY 1 SCH0265AR0 MAINSDISTRIBUTIONBOARD 1 SCH0288AR1 POWERSUPPLYINTERFACEBOARD 1 V0760 BLACKPLASTICTAP 1 APT144CM V0962 TERMINALBLOCK 3 APT144CM Z0021 MECHANICALDETAIL 2 Z0081 MECHANICALDETAIL 1 Z0673 COVER 1 ...

Page 28: ... 00 APT144CM AUTV 1500LDLDMOSUHFTVAMPLIFIER 1 CMS6006 1m1 2 CABLEFOR7 16 MALECONNECTOR 1 CSS5011 1 5mRG58CABLEFORN NMALECONNECTOR 1 DET0434 DET0434R2MECHANICALDETAIL 1 DET0536 DET0536R3MECHANICALDETAIL 2 APT144DM DET0564 DET0564R0MECHANICALDETAIL 1 DET0565 DET0565R0MECHANICALDETAIL 1 DET1028 DET1028R0MECHANICALDETAIL 2 APT144DM DIG DET1051 DET1051R0MECHANICALDETAIL 2 APT144DM DET1069 DET1069R0MECH...

Page 29: ...AR1 DESCRIPTION The Control Board SCH0223A manages the operational logic of the amplifier switching on and off power supplyandfans alarmsandprotections remotecontrol human machineinterface Allofthatisperformedby a modern and powerful 16 bit micro controller which is the main part of the board ...

Page 30: ...Connectors On the board SCH0223A there are several connectors used as interfaces for the peripherals of the apparatus andtheportsforexternalcommunication POWER SUPPLY TheconnectorsJ1 J6 J8eJ12areusedtoconnectthepowersupplypoweringtheRFmodules Thenumber of power supply used changes depending on the amplifier up to eight power supply They are connected in the order shown inTable 1 below Remaining co...

Page 31: ... each amplifier and the Amplifier Control are connected to the same 4 wires RS485 bus and each of them has a unique address which can be set by means of the keys and the display for correct communication Incaseofsingle stand alone amplifier theRS485connectorcanbeusedtointerfacetotheRemoteControl Unit RCU madebyElettronikaS r l Thisunitallowstomonitorandcontroltheremotetransmitterfromany site provi...

Page 32: ...en again impulse controls Theinterlockpinmaybeusedasprotectionsothattheamplifierisswitchedoffwhenthedigitalinputlevelis low It is possible to use several serially connected switches to make an interlock chain Usually all switches are closed and the interlock level is low thus the amplifier is on If even only one of the switches is open the You can select by means of two jumpers on the board JP1 an...

Page 33: ...amplification stages the connector is provided with two digitaloutputlinescalledAGCAlarm Underalarmconditions thislinesarebroughtbythemicro controller at a low level so that the exciter can stop the AGC Table 4 shows the connection between the J10 connector on the board and the DB9 connector on the rear panel along with the description of each pin the direction of the pin is referred to the positi...

Page 34: ...ed AUX J4 J5 and J17 connectors are not used and are there only for future updates The SW1 dip switches are partially used for the configuration of the correct mode for the micro controller The other switchesarenotused Itisimportantthatthepositionofthedip switchesisleftunchanged becausechanging itmaysetawrongmodeforthemicro controller affectingtheworkofthewholeamplifier 2 For more information abou...

Page 35: ...125 SCH0223AR1 Top layer Component layout ...

Page 36: ...126 SCH0223AR1 Bottom layer Component layout ...

Page 37: ...019ASMDDIODESCHOT 5 5A 1 D23 DBAS85 S 03024SMDDIODESCHOTTKY 2 D14 15 DBAT54S 03199SMDSCHOTTKYDIODE 19 D3 4 D10 13 D16 22 D24 29 DISMGLS12864T 03083A128x64DOT 1 DIS1 DLKA 3528SGC03057 03057GREENSMDLEDDIODE 7 DL2 DL5 10 DLLEDG503060 03060GREENLEDDIODE5mm 1 DL1 DLLEDR503061 03061REDLEDDIODE5mm 1 DL4 DLLEDY503054B 03054BYELLOWLEDDIODE5mm 1 DL3 IC24LC6404815 04815SMDINTEGCIRCUIT 1 IC17 IC78M124307B 043...

Page 38: ...206 1 R68 R 1206 N M N M RES 1 4W 5 SMD 1206 1 R91 R1K0 1 S00041B 00041BRES1 4W1 SMD1206 8 R17 R54 R59 60 R76 77 R86 R90 R22K 1 S00057B 00057BRES1 4W1 SMD1206 11 R9 R21 R26 R28 29 R37 R45 R48 50 R69 R2K2 1 S00045B 00045BRES1 4W1 SMD1206 3 R52 R55 R61 R330K 1 S00071D 00071DRES1 4W1 SMD1206 1 R66 R330K S00071A 00071ARES1 4W5 SMD1206 1 R65 R470K S00073A 00073ARES1 4W5 SMD1206 11 R8 R23 R40 R42 R46 R5...

Page 39: ...ty Comps CC2nF22kV01045A 01045ACERAMICCAPACITOR 2 C1 2 CNV AC DCATC 12S E0037ACDCCONVERTER 1 CNV1 D1N414803001 03001DIODE 2 D1 2 DLLEDG303053 03053GREENLEDDIODE3mm 1 DL1 JCONHD515V 05 4PVE 02881 02882PANDUITPCBCON 1 J2 JCONHD515V 05 5PVE 02895 02896PANDUITPCBCON 1 J1 R2K70046 0046RES1 4W5 1 R1 RL40 31 24 7567CRELE 2 RLY1 2 ...

Page 40: ...EM CONNECTOR 4 J1 J4 5 J8 R0R0 S00001 00001RES1 4W5 SMD1206 16 R1 R8 R12 R15 R21 R23 R26 R28 R33 R40 R44 R47 R53 R55 R58 R60 R100K 1 S00065B 00065BRES1 4W1 SMD1206 8 R3 R6 R17 R32 R35 R38 R49 R64 R 1206 N M N M RES 1 4W 5 SMD 1206 16 R2 R10 R14 R16 R19 R24 R29 30 R34 R42 R46 R48 R51 R56 R61 62 R8K2 1 S00052B 00052BRES1 4W1 SMD1206 8 R4 5 R18 R31 R36 37 R50 R63 RV3266WN M N M VARIABLERESISTOR 16 R7...

Page 41: ...W Gain 23dB 2 Driver Stage Quiescent Current cold 4A 2A for each transistor to 32V Amplifier Stage Quiescent Current cold 2A 1A for each transistor to 32V RF Input Impedance 50Ω RF Output Connector Impedance 7 16 Female 50Ω MTF0070CR0 COMPONENT LIST ElettronikaCode Description Qty 00001 0Ω1206SMDRESISTOR 2 00221B 75Ω1206SMDRESISTOR 2 01041D 1nF1206SMDCERAMICCAPACITOR 2 01400 BYPASSINGCAPACITOR 13 ...

Page 42: ...5 SOCKET TLM SOCKET AGC SOCKET LCD DISPLAY To AMPLIFIER CONTROL SCH0223A SCH0192A INTERFACE BOARD FWD RF INPUT 2 WAY WILKINSON DIVIDER 4 WAY WILKINSON DIVIDER SCH0192A RF IN 4 RF OUT 4 SCH0192A SCH0192A SCH0192A RF IN 7 RF OUT 7 RF IN 5 RF OUT 5 RF IN 6 RF OUT 6 SCH0192A RF IN 8 RF OUT 8 8 WAY WILKINSON COMBINER MONITOR SCH0192A SCH0192A DRIVER SCH0192A REF 4 WAY WILKINSON DIVIDER ...

Page 43: ... T4 T44 T5 T55 T66 T6 T7 T77 T8 T88 T12 T13 T14 T15 T16 T15 PN1083A TP3 TP4 TP5 TP6 TP7 TP8 T99 T14 T14 T8 T7 T6 T5 T4 T3 T2 T1 SCH0192A RF AMPLIFIER BOARD 1 SCH0192A RF AMPLIFIER BOARD 2 SCH0192A RF AMPLIFIER BOARD 3 SCH0192A RF AMPLIFIER BOARD 4 SCH0192A RF AMPLIFIER BOARD 5 SCH0192A RF AMPLIFIER BOARD 6 SCH0192A RF AMPLIFIER BOARD 7 SCH0192A RF AMPLIFIER BOARD 8 SCH0192A DRIVER MODULE T12 T13 8...

Page 44: ...oardincludesRFsectionamplifier biascircuit protectioncircuitand matchingnetworks AsilverplatedcopperplateisbrazedwithPCBinordertoobtainlowthermalresistance Providingaminimumof200WPksynclinearpower thismoduleistheperfectamplifierforanybroadband UHFpowertransmitter TECHNICALCHARACTERISTICS Frequency Range 470 860MHz Output Power 200WPEP Gain 14dB 1 Output LDMOS Power Supply 32V 2 Output LDMOS Bias C...

Page 45: ...ofafasteningscrew thengivepowerandcheckdata the stabilised voltage on the zener diodes DZ1 and DZ2 is about 15V compared to the ground the stabilised voltage on the zener diodes DZ3 and DZ4 is about 6 8V compared to the ground the voltage on the pads to which the gates of the LDMOS transistors will be soldered R23 and R24 resi storsside changesfrom0Vtoamaximumvalueofabout6Vwhenmovingtherelevanttri...

Page 46: ...dule thistimeturnignR8andcheckingthattheindicationof thecurrentontheamperometerincreasesto2Atotal whichincludesthecurrentoftheotherdevicelefton STEP9 Check the response curve of the module by means of the network analyser STEP10 Check the response curve for low signal with centre 660MHz and span 500MHz 2dB div STEP11 The curve should be similar to the one enclosed with a tolerance of 0 5dB To obta...

Page 47: ...137 SCH0192AR0 LDMOS UHF Amplifier Board Component layout ...

Page 48: ...9 20 01123 20pF500VPORCELAINCAPACITOR ATC ATC100B200JT500XT 4 C29 32 01104 1 3pF500VPORCELAINCAPACITOR ATC ATC100B1R3DT500XT 2 C33 34 01143 470pF200VPORCELAINCAPACITOR ATC ATC100B471KW200X 4 C35 38 01108 4 7pF500VPORCELAINCAPACITOR ATC ATC100B4R7DT500XT 2 C57 58 01117 10pF500VPORCELAINCAPACITOR ATC ATC100B100JT500XT 2 C55 56 01104B 3 6pF500VPORCELAINCAPACITOR ATC ATC100B3R6DT500XT 2 C43 44 01119A ...

Page 49: ... 02700 02701 02700PCBCONNECTOR 1 J21 JSCREWCONN202853 02853PCBSCREWCONNECTOR 2 J11 J19 JSCREWCONN302860 02860PCBSCREWCONNECTOR 1 J20 JTESTP1 3mm07913 07913TESTPOINT 17 J1 10 J12 18 JUJUMP202739 02742 02739 02742PAN2MALE 3 JP1 2 JP4 JUJUMP302707 02742 02707 02742PAN3MALE 1 JP3 R0R33 1W S 00380RES1W5 SMD2512 2 R1 2 R100K S00065A 00065ARES1 4W5 SMD1206 1 R7 R220R S00033A 00033ARES1 4W5 SMD1206 1 R4 R...

Page 50: ... in cooling Fan ON OFF control Built inremotesensefunction Fixedswitchingfrequencyat110kHz MECHANICALSPECIFICATION 170 150 5 0 9 3 2 M3 L 16mm max 2 M3 L 4mm max 9 5 11 5 8 11 5 120 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 7A 50 60Hz 100 240VAC INPUT AC S V 24V 20A S VADJ SP 500 24 E 183223 LE V EL5 R C G L N FG NC NC R C PIN N ASSIGNMENT PIN N ASSIGNMENT 1 AC L 7 R C 2 AC N 8 S 3 FG 9 11 DC OUTPUT V 4...

Page 51: ...67 2V Protection type Hiccup mode recovers automatically after fault condition is removed FAN CONTROL O T P RTH1 or RTH2 50 C FAN ON 45 C FAN OFF 70 C output shutdown FUNCTION REMOTE CONTROL RC RC Short power on Open power off ENVIRONMENT WORKING TEMP 10 50 C Refer to output load derating curve WORKING HUMIDITY 20 90 RH non condensing STORAGE TEMP HUMIDITY 20 85 C 10 95 RH TEMP COEFFICIENT 0 03 C ...

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