MIZAR FM Transmitter System CODE APF073A TITLE MIZAR FM TRANSMITTER REV 1.
MIZAR Transmitter Family POWER 30W 300W APF073A MIZAR30 APF074A MIZAR300 APF073A+OPT023 MIZAR30S APF074A+OPT023 MIZAR300S AUDIO MONO STEREO 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.
Summaries Mizar Transmitter Family .................................................................................................. 2 Summaries ......................................................................................................................... 3 Warning .............................................................................................................................. 7 Warranty ...............................................................................................
- Description of the adjustment points ................................................................... 41 - Component layout for adjustment points ............................................................. 42 - RF Section .......................................................................................................... 43 - Modulation Section.............................................................................................. 43 - Audio Section .......................................
- MFF0031A 300W Amplifier Module ............................................................................. 63 - Description .............................................................................................................. 63 - Technical Characteristics ........................................................................................ 63 - MFF0031A Component list ...................................................................................... 63 - MFF0031A Component layout ......
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.
FM TRANSMITTER SYSTEM MIZAR User’s manual 15
Section 1 - Information Contents: 1.1 Description 1.2 Technical characteristics 1.3 Front Panels 1.
MIZAR FM SYSTEM 1.1 DESCRIPTION The MIZAR represents a family of radio transmitters available with 30W and 300W power, completely controlled by microprocessor, used for radio transmissions in FM band, both stereo and mono. The high technological content along with the use of surface mounting components allowed the realization of an apparatus with excellent performances and limited dimensions. The extremely simplified wiring increases the reliability of the whole system and makes testing easier.
1.2 TECHNICAL CHARACTERISTICS RF SECTION Frequency Range / Step Reference Stability Nominal Output Power Power Level Output Impedance / Connector RF Monitor Level / Connector Off lock Attenuation Asynchronous AM S/N ratio Synchronous AM S/N ratio Spurious and Harmonic supp. Modulation Capability 87.5 - 108MHz / 10-50-100kHz (from front panel) 87.0 - 108MHz for China, other bands on request ±2.
SCA OPERATION (2 Inputs) SCA Input impedance SCA Input connector Input level Frequency amplitude response 10kΩ BNC 2Vpp nominal for ±7.5kHz deviation ±0.
1.3 FRONT PANELS 2 7 8 9 7 8 9 MIZAR FM SYSTEM STATUS 1. Status LEDs 2. LCD Display 3. Push Buttons 4.
1.4 REAR PANELS 1 4 3 2 5 6 7 8 9 10 11 * 1. Main Switch 2. Power Supply Socket with Fuse (5A) 3. RF OUT Connector 4. RS232 / RS485 Socket 5. Telemeasures Socket 6. SCA2 Input 7. SCA1 Input 8. MPX Input Signal 9. MONO / RIGHT Input Signal 10. LEFT Input Signal 11.
LOW PASS FILTER 50 s LEFT MPX OUT LOW PASS FILTER 50 s MONO / RIGHT MPX IN SCA1 SOCKET SCA2 SOCKET CODER CODER BOARD LEFT RIGHT LIMITER TCXO PLL VCO RS232 / RS485 SOCKET TELEMEASURES SOCKET LEVEL DISPLAY BOARD RF DRIVER MOTHER BOARD REF GATE AC SOCKET FILTER 27V AC/DC VAC INTERFACE BOARD FWD MONITOR BLOWER RF OUT Block diagram 23
Section 2 - Installation Contents: 2.1 Operating environment 2.2 First installation 2.3 Installation of MIZAR Mono with external Stereo Coder 2.4 Installation of MIZAR Stereo with external RDS Coder 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. Do not locate the transmitter directly above a hot piece of equipment. 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.
2.3 INSTALLATION OF MIZAR MONO WITH EXTERNAL STEREO CODER MPX OUT STEREO CODER LEFT RIGHT 2.
2.5 MIZAR REMOTE CONTROL WITH ELETTRONIKA RCU In order to connect MIZAR to RCU the RS232 / RS485 connector must be set to RS485. This choice is done cabling the rear panel connector to the J1 (RS485) or J2 (RS232) on the Display Board.
Section 3 - Operations Contents: 3.1 User interface and Software settings 3.2 AGC Implementation 3.3 Alarms and automatic behaviours 3.
3.1 USER INTERFACE AND SOFTWARE SETTINGS When the equipment is switched on, the display shows the presentation screen, containing the name of the device and the release number of the firmware. FM Stereo TX Software V2.4 FM Mono TX Software V2.4 The mono/stereo choice is made automatically by MIZAR, detecting the presence of the Stereo Coder Board (OPT023). At this stage the device restores the last configuration saved of power, frequency and all other parameters.
This shows the value of temperature of the heat sink. Temperat. 37°C ·········| | | | | This shows if the PLL generating the output frequency is locked or not. PLL VCO Lock Stereo with coder ON. L·········| | | | | R·········| | | | | This shows the frequency deviation of the carrier. Deviation ·······| | | | | Stereo Coder OFF Emphasis OFF Frequency 100.00 MHz Frequency Step 100 kHz INTERNAL AGC ENABLED AGC STATUS Lock This shows the Stereo Coder position.
- Low Read: AGC stopped because power reading is too low; - Lock: AGC goal has been reached; - Max: AGC stopped because of maximum power increasing; - Min: AGC stopped because of maximum power decreasing; - Pull-up: AGC is increasing power; - Pull-down: AGC is decreasing power. Remote DISABLED TLM Command ON This shows the remote control habilitation. It is possible to choose either ENABLED or DISABLED position.
3.3 ALARMS AND AUTOMATIC BEHAVIOURS The apparatus signals a working anomaly when any of the following conditions is met: PLL Unlock Forward Power exceed the threshold Reflected Power exceed the threshold Temperature of the Heat Sink exceed the maximum allowed In case of failure of any of these parameters, the apparatus automatically mute the output power and change the menu to the Log menu with the last alarm highlighted.
Section 4 - Diagram Contents: - APF073A MIZAR30 Cable diagram - APF074A MIZAR300 Cable Diagram - APF073A_APF074A MIZAR Component list - Modules description 35
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Component list APF073A_APF074A - MIZAR Part Name Code Description Qty 02035 02513 02518 02695 02699 02700 02833 02841 02855 05069 05551B 05552B 07522 07524A 07602 07613 07918 07924 07925 07926 08502 CON0306 CON0340S CON0354R2S DET1220 DET1317R0P DET1361R0P E0050 E0060 FUS5A FUS10B MFF0025BR0 MFF0031AR0 PAN0141 PAN0153R0P SCH0372AR1 SCH0377AR2 V0761 V0768 BNC CONNECTOR FOR RG316 CABLE 90 SMB SOCKET cod.
MOTHER BOARD SCH0377AR2 DESCRIPTION The board contains the stages needed to condition the audio MONO or RIGHT signals and modulate in frequency a synthesised oscillator. It provides an output radio frequency signal in the II-VHF band, to drive the final amplification stage. The various sections are analysed below: 1. Balanced/Unbalanced Converter: the conversion from balanced to unbalanced and the input interface of the audio signal are realised la electronically by the IC1-A operational circuit.
9. Telemetering: the most important analogue signals – forward and reflectesd power, switch on/off, alarms and temperature – are buffered and made available on the J5 socket for connecting remote control systems.
CALIBRATION PROCEDURE - Instrument list MEASURE INSTRUMENT RF Signal level - Spectrum Analyser Frequency - Spectrum Analyser Audio Modulation Limiter intervention - Audio Generator - FM/AM Modulation Analyser - Oscilloscope Description of the adjustment points COMPONENT DESCRIPTION R1 MONO/RIGHT Audio Input level R2 MPX Input level R3 SCA1 Input level R4 SCA2 Input level R21 Modulation depth adjustment R80 Indication of the RIGHT signal deviation on display (only if the stereo option is
Component layout for adjustment points 42
RF Section Check the lock of the oscillator on the whole operating range (87 - 108MHz). If the synthesised frequency is not correct, try to correct it by means of the capacitive trimmer of the OSC1 reference. Verify the signal-to-noise ration (CCIR) of the oscillator, which should be >73dB on the whole band. Verify the output level by the J9 (RF OUT) connector, higher than 24.5dBm on the whole band. Verify that the final stage is switched off when the PLL of the oscillator unlocks.
SCH0377AR2 COMPONENT LIST Part Name/Number Description Qty. Comps. 257BLR-3618N 05010 CC 100nF-S 01065C C62-63, 05010 AUDIO TOKO FILTER 01065C Y5V 1206 CAPACITOR 2 LP1-2 20 CC 10pF-S 01086 CC 1206 N. M. CC 1nF-2%-S 01041D 01086 SMD 1206 CAPACITOR N. M. SMD 1206 CAPACITOR 01041D SMD 1206 CAPACITOR 1 1 23 CC 27pF-S 01022B CC 6p8F-S 01084 CE 100uF16V-S 01792A CE 10uF16V-S 01776A 01022B SMD 1206 CAPACITOR 01084 SMD 1206 CAPACITOR 01792A ELET. SMD CAPACITOR 01776A ELET.
Part Name/Number Description Qty. Comps.
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STEREO CODER BOARD OPT023 DESCRIPTION The board contains the stages needed for the conditioning of the Left channel audio signal and for realising the stereo encoding in compliance with the standard ITU racc. 450. The Right signal is provided through the connection to the Mother board. The various sections are analysed below: 1.
CALIBRATION PROCEDURE - Instrument list MEASURE INSTRUMENT RF Signal level - Spectrum Analyser Frequency - Spectrum Analyser Audio Modulation Limiter intervention - Audio Generator - FM/AM Modulation Analyser - Oscilloscope Description of the adjustment points COMPONENT R1 LEFT Audio Input level R25 Adjusts Left on Right signal crosstalk R26 Adjusts Right on Left signal crosstalk R27 Indication of the LEFT signal deviation on the display C28 Adjusts the 19kHz pilot tone frequency C36 Adj
Component layout for adjustment points Coder Section Enable the Stereo mode from display. Measure, and correct by means of C28 if needed, the frequency of the pilot tone (19kHz) With modulation analyser and audio signal on the LEFT input at 2.2Vpp, verify the frequency response from 30 to 15kHz without emphasis. Correct any deviation from the nominal range by acting on LP1 and LP2. Insert the JP4 jumper (50µs) and enable the emphasis from the display. Check the frequency response.
SCH0378AR2 COMPONENT LIST Part Name/Number Description 257BLR-3618N 05010 CC 100nF-S 01065C CC 1nF-2%-S 01041D CC 27pF-S 01022B CE 10uF16V-S 01776A CE 22uF16V-S CE 470uF-S 16V-S CV 4.5-20pF-S 01481 CV 7-50pF-S 01474 D BAT54S IC LM833-S 04643A IC LMC6482-S IC MC14066BD-S 4708B IND 22uH-S 5023D J BNC-90G-PCB SHIELD J FC-16P 02701-02700 J NC3FD-H 02862 J SMB-PCB N. M.
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DISPLAY BOARD SCH0372AR1 DESCRIPTION The MIZAR display board contains the HMI (human machine interface) of the equipment composed by a alphanumeric 2 rows x 16 columns displayand a keys series, a connector for collecting and sending datas towards the equipment mother-board and its thinking heart made by a Flash microcontroller. The board is able of reading 8 analogic signals coming from mother-board. These are only bufferized on the board and therefore their conditioning is made on the mother-board.
SCH0372AR1 COMPONENT LIST Part Name/Number Description Qty. Comps. CC 100nF-S 01065C 01065C Y5V 1206 CAPACITOR 20 C3-5, C7, C12, C14, C16-17, C24-28, C30, C31-35, C37 C1-2 C8, C11, C13, C15, C18-20 C6, C9-10, C21-23 C29, C36 D1-2 LCD1 DL3 DL1 DL2 IC3 IC5 IC8-9 IC7 IC4 IC1 IC2 IC6 L1 J1-2 J5 J3-4 JP1 R6-7 R9, R16-17, R20 R3 R18 R19 R8 R2, R4-5, R11-12 R13-15 R1 R10 T1 TR1 XTAL1 CC 15pF-S 01088 01088 SMD 1206 CAPACITOR CC 1uF100V-S 01760A 01760AY5V 1206 50V CAPAC.
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30W FM AMPLIFIER MODULE MFF0025BR0 DESCRIPTION The MFF0025B amplifier module is designed to amplify the FM modulated carriers in the 87-108MHz band, and can provide an output of 30W CW. In order to obtain the desired gain, the amplifier is made up by two gain stages: the pilot stage uses a BLF242 MOSFET, while the final stage uses a BLF245 MOSFET. An input adaptation circuit allows the adaptation of the module to the various driving levels.
MFF0025BR0 Component layout CALIBRATION PROCEDURE The calibration procedure is mainly made of three step: 1. Calibration of the Output Filter 2. Polarization of the BLF242 and BLF245 MOSFETS 1.
Calibrate the spectrum analyser after setting a 100MHz span centered ad 100MHz (10MHz/div - 5dB/ div). Connect the input of the filter to port 1 of the network analyser, connect the output of the filter to a dummy load. Display the reflection coefficient (parameter s11). The calibration consists in acting on the coils (L8, L9, L10, L11) to obtain a curve as the one shown in picture A after closing the module.
2. Polarisation of the BLF242 and BLF245 MOSFETs - Instrument list MEASURE Polarisation of BLF242 and BLF245 Transistors INSTRUMENT Two Digital meter - Description of the adjustment points COMPONENT R15, R7 DESCRIPTION Adjust polarisation Disconnect the input terminal of the module, connect the dummy load to the output terminal and connect a tester as amperometer (10A cc capacity) on the power supply line (in place of the fuse). Turn R7 and R15 completely clockwise (so to interdict the VDMOS).
SCH0382BR0 30W FM Amplifier Board Component layout 59
SCH0382BR0 COMPONENT LIST Part Name/Number Description 25Ohm 08523 CC 100pF-S 01092 CC 100nF-S 01065C CC 33pF-S 01023A CC 1p2F-S 01081 CC 1nF-S 01096 CC 39pF-S 1024A CC 47nF-S 01061A CC 6p8F-S 01084 CE 10uF50V-S 01779A CP 100pF-S 01135 CP 150pF-S 01137 CP 33pF-S 01127 CP 470pF-S 01143 CP 68pF-S 01131 CP 3p6F-S 01104B D 1N4148-S 03002 D HSMS2802 03207 DZ 3V9-S IND 6 SP_D4_d0.8mm-S IND 7 SP_D6_d0.8mm-S IND 4 SP_D8_d1.
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300W FM AMPLIFIER MODULE MFF0031AR0 DESCRIPTION The Amplifier Module MFF0031A was designed to amplify FM carriers in the 87 - 108MHz band, and is able to provide an output of 300W CW. Besides it is provided with an RF Monitor output with a level of 40dBc ±3dB. In order to obtain the desired gain, the amplifier is made up by two gain stages: the pilot stage uses a MOSFET BLF244, the final stage a MOSFET SD2942. An input adaptation circuit allows to adapt the module to various driving levels.
MFF0031AR0 Component layout 64
CALIBRATION PROCEDURE - Instrument list MEASURE INSTRUMENT Calibration of the Output Filter Network analyser or alternately Spectrum analyser with tracking generator and SWR Bridge Output Filter Section Calibrate the Network Analyser after setting a 100MHz span centred on 100MHz (10MHz/div - 5dB/div). Connect the input of the filter to port 1 of the Network Analyser. Connect the output of the filter to a dummy load. Display the Reflection coefficient (parameter s11).
coils on the SCH0427A board. Power the module and check with a Digital Tester that the level of the voltages on the Interface Boards (SCH0426A and SCH0371B) matches the one shown in table Tab.1 and Tab.2 respectively: CONTROL POINTS VOLTAGE MEASUREMENT TP1 +50V TP2 +28V TP3 +50V Tab.1 CONTROL POINTS VOLTAGE MEASUREMENT PIN 3 of IC5 PIN 3 of IC6 +50V PIN 2 of IC5 +20V PIN 2 of IC6 +24V PIN 3 of IC4 +12V PIN 3 of IC3 +5V Tab.
- Description of the adjustment points COMPONENT R4, R24 DESCRIPTION Adjust polarisation Disconnect the input terminal of the module. Connect the dummy load to the output terminal. Turn R4 and R24 completely clockwise (so to interdict the transistors). Disconnect the passing capacitor from TP3 Gate. Turn the R4 trimmer counterclockwise until the display of the Amperometer shows an absorption of 300mA. Stop powering the module.
SCH0427AR0 300W FM Amplifier Board Component layout 68
SCH0427AR0 COMPONENT LIST Part Name/Number Description Qty. 01081 CC 100pF 01029 CC 150pF 01031 CC 220pF 01033 01096 CC 10nF 01053 CC 47nF 01061 CC 100nF 01065 01073A CC 39pF 01024 01127 01779 01795B 01143 01206 01210 01211 R 220 00033A R 1K 00041A R 3K 00047A R 2.7K 00046A R 6.8K 00051A R 33K 00059A R 100K 00065A R 1M 00077A R 10 00127 R 18 00130 R 22 00131 R 27 00132 R 47 00135 R 560 00148 R 100K 00661 R 100K 00791 R 50K 00797 05043 05045 05013 05064 C0129 05064 08504 C0171 CAV105 01081 1.2pF MULT.
Part Name/Number Description CAV095 07684 PN0666A 03009 03203 R 22K 00057A 03134 01027 05042 01205 03471 03981 CAV095 50Ω 288mm RG303 CABLE 1 1.2mm SILVER WIRE 0.70 PRINTED CIRCUIT BOARD 1 1N4007 DIODE 1 BAT83 DIODE 2 00057A RES SMD 1206 1 ZENER 3.9V DIODE 2 01027 68pF CAPACITOR 1 05042 3 TURNS 4mm INDUCTOR 2 01205 22pF 500V CAPACITOR 1 03471 SD2942 TRANSISTOR 1 03981 BLF244 TRANSISTOR 1 70 Qty. Comps.
SCH0426AR0 FM Amplifier Interface Board Component layout SCH0426AR0 COMPONENT LIST Part Name/Number Description Qty. Comps. 04340A 01065I 01065C R 0.15 00405 R 4.7K 00049B R 220 00033C 01791A PN1316AR1B 04340A LM317HVT LINEAR REG.
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INTERFACE BOARD SCH0371BR0 SCH0371BR0 Interface Board Component layout SCH0371BR0 COMPONENT LIST Part Name/Number Description Qty.
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S-100F-24 SWITCHING POWER SUPPLY E0060 MAIN FEATURES - AC Input range selectable by switch - Protections: Short circuit / Over load / Over voltage - Cooling by free air convection - 100% full load burn-in test - Fixed switching frequency at 83kHz MECHANICAL SPECIFICATION 1 3.5 12 9 7 197 9.5 2 98 80 4 85.5 3 8.2 5 6 7 3. 4- 5 M 3 57.5 4.5 120 199 190 3.5 38 3 28.5 3 .5 3 -M 18 18 9 9.5 6.5 157 22 TERMINAL Pin.
TECHNICAL CHARACTERISTICS MODEL S-100F-15 DC VOLTAGE S-100F-24 15V 24V RATED CURRENT 6.7A 4.5A CURRENT RANGE 0 ~ 6.7A 0 ~ 4.5A RATED POWER RIPPLE & NOISE (max.) Note 2 100.5W 108W 125mVp-p 150mVp-p 13.5 ~ 16.5V 21.6 ~ 26.4V OUTPUT VOLTAGE ADJ. RANGE VOLTAGE TOLERANCE ± 1.0% ± 1.0% ± 0.5% ± 0.5% LOAD REGULATION ± 0.5% ± 0.5% SETUP, RISE, HOLD TIME 1s, 30ms, 15ms at full load Note 3 LINE REGULATION VOLTAGE RANGE 88 ~ 132VAC FREQUENCY RANGE 47 ~ 63Hz EFFICIENCY (Typ.
PSP-650-48 DE2 SWITCHING POWER SUPPLY E0050 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 - Current sharing up to 2400W (3+1) - Built-in remote ON-OFF control - Built-in remote sense function - Fixed switching frequency at PFC:88kHz PWM:100kHz MECHANICAL SPECIFICATION 2-M3 L=4mm max. 100 Assignment AC/L AC/N FG P(Current Share) POK R.C. G R.C.
TECHNICAL CHARACTERISTICS M OD E L P S P -65 0-48 D C V OLTAGE 48 V R AT E D C U R R E N T 13 .5 A C U R R E N T R AN GE 0 ~ 13 .5 A R AT E D P OW E R 65 0W R IP P L E & N OIS E (m ax.) N o te 2 30 0m V p-p OU T P U T V OLTAGE AD J. R AN GE V OLTAGE T OL E R AN C E IN P U T 41 ~ 5 6V N o te 3 ± 1.0% L IN E R E GU L AT ION ± 0.5% L OAD R E GU L AT ION ± 0.
BLOCK DIAGRAM PFC fosc: 88kHz PWM fosc: 100kHz FAN SIGNAL CONTROL POK CURRENT SHARING CIRCUIT I/P EMI FILTER RECTIFIERS & P.F.C. ACTIVE INRUSH CURRENT LIMITING RECTIFIERS & FILTER POWER SWITCHING P +V -V RC.G. O.C.P. FG PWM CONTROL O.L.P. RC DETECTION CIRCUIT O.V.P. O.T.P.
CONTROL TERMINAL INSTRUCTION MANUAL +V L N FG P +V +V +V -V + POK RCG RC -V -V -V +V L N FG P +V +V +V -V - + LOAD POK RCG RC -V -V -V +V L N FG P +V +V +V -V - + LOAD - Rem ote Control Power ON: RCG and RC for short Power OFF: RCG and RC for open POK Signal is the voltage difference between "RCG" and "POK" pin output POK Signal for TTL level signal PS U turn on: 3.3V ~ 5.
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