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GWP-G22906

3-2

Power Amplifier Section

3-2-1

VA3000QE Power Amplifier

The VA3000QE is a power amplifier of peak output power 2000W, which is used for

common amplification of Analog TX.

Unit gain is approximately 76dB. The gain can continuously be varied by the input variable

attenuator (LEVEL ADJ).

3 - 5

Содержание PCN-1815SSQN/1Cx2

Страница 1: ...HF ANALOG TV TRANSMITTER PCN 1815SSQN 1Cx2 30KW VHF ANALOG TV TRANSMITTER INSTRUCTION MANUAL INSTRUCTION MANUAL INSTRUCTION MANUAL INSTRUCTION MANUAL PCN 1815SSQN 1Cx2 30KW VHF ANALOG TV TRANSMITTER PCN 1815SSQN 1Cx2 30KW VHF ANALOG TV TRANSMITTER PCN 1815SSQN 1Cx2 30KW VHF ANALOG TV TRANSMITTER ＩＮＳＴＲＵＣＴＩＯＮＭＡＮＵＡＬ VOL Ⅰ ...

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Страница 14: ...TV TRANSMITTER ...

Страница 15: ...tenance HO2 344916 201 6 Warranty and Repair HO2 344916 201 7 Units and Panels DM 3100AB Exciter HO2 344644 203 6 Way Power Divider HO2 344487 201 VA3000QE PA 200 W HO2 344987 201 6 Way Power Combiner HO2 344488 201 HPC 1508 TX Control HO2 344485 201 SNMP Agent for TV TX HO2 343600 201 WEB Remote Control HO2 343601 204 Directional Coupler HO1 342678 205 Indoor Coaxial Feeder HO1 340761 204 Liquid ...

Страница 16: ... G22906 8 Output Coaxial Equipment TXASU H 430R0 Output Coaxial Equipment HO2 344989 201 HPC 1253 System Control CA22 HO2 344922 201 SNMP Agent for TV TX HO2 344140 201 WEB Remote Control HO2 343437 201 ii ...

Страница 17: ...erage Picture Level Attenuator Automatic Average Blower Buffer Amplifier Balance Band Elimination Filter Band Pass Filter Capacitor Calibration CCIR CCW CIB D CIN D CH CI CLK CN CNO CO COAX COM COMB COMP CONT CORR CPU CR CR CS CT International Radio Consultitive Committee Conuter Clockwise Constant Impedance Band Pass Diplexer Constant Impedance Notch Diplexer Channel Contineous Signal Input Clock...

Страница 18: ...fferential Phase Digital Video Compensator Electro Lunminescent Display Envelope Equalizer Exciter External Fuse Frequency G H I J FB F B FC FIFO FIL FIL FIR FM FPA FREQ G GND GDC HF HT IC ICPM ID I D IF I F IM INT I O IRT J Feed Back Flat Cable First Input First Output Filament Filter Finite impulse Response Frequency Modulation Final Power Amplifier Frequency Ground Graphic Display Controller Ha...

Страница 19: ...aker A Kind of Multi Sound System Normal Invert Nation Television System Committee O P NVRAM OCXO OFS OL OLR O P OPE OPF OSC P PA PAL PARA PCB PC PI PCM PIE PJ PLL PO POW PRE EM PROC PS PWB PWR Nonvolatile Randam Access Memory Oven Controlled Crystal Oscillator Offset Over Load Over Load Relay Output Power Operation Output Filter Oscillator Connector Plug Power Amplifier Phase Alternation by Line ...

Страница 20: ...ic Wave Subcarrier Silicon Controlled Rectifer Séquentiel Coulours A Mémoire Select Separator Signal Generator Signal T U S RFRM ST STL SW SYG SYNC SYNTHE T TB TCXO TEMP TDR TH T L TOCOM TR TRS TTL TX UHF UNBAL UBL Snchronized Waveform Reformed Stereo Phonic Studio to Transmitter Link Switch Synchronized Waveform Gate Synchronize Synthesizer Transformer Terminal Board Temperature Compensated Cryst...

Страница 21: ...riable Capacitor Voltage Controlled Crystal Oscillator Video Distribution Amplifier Variable Frequency Oscillator Very High Frequency Variable Resistor Vestigial Single Side Band Vestigial Single Side Band Filter Voltage Standing Wave Ratio Wire Circulator Crystal Circulator Divider Combiner Directional Coupler Surge Absorber Surge Absorber ...

Страница 22: ...5 2 5 Composition 2 6 2 5 1 Functional Composition 2 6 2 5 2 Physical Composition 2 8 SECTION 3 FUNCTIONAL DESCRIPTION 3 1 Exciter Section 3 2 3 1 1 DM 3100AB Exciter 3 2 3 1 2 Characteristics 3 3 3 1 3 Exciter switch 3 4 3 2 Power Amplifier Section 3 5 3 2 1 VA3000QE Power Amplifier 3 5 3 3 Cooling Section 3 7 3 4 Output Section 3 7 3 5 Control Section 3 8 3 5 1 General 3 8 3 5 2 Control Method 3...

Страница 23: ...3 7 6 Others 3 34 SECTION 4 OPERATION AND ADJUSTMENTS 4 1 General 4 1 4 2 Operation Panel 4 8 4 3 Control Mode Selection 4 11 4 4 Starting and Stopping 4 12 4 5 Setting 4 14 4 5 1 Setting of Time 4 14 4 5 2 Setting of visual Frequency rated output power and transmitter type 4 14 4 6 Adjustments 4 16 4 6 1 Adjustments of TX meter and faults levels 4 16 4 6 2 Adjustments of Exciter 4 19 4 6 3 Adjust...

Страница 24: ...Inability Starting 5 9 5 6 2 Output Lowering 5 9 5 6 3 C N Lowering 5 9 5 6 4 Detection of Reflection Power 5 10 5 7 Replaceable Parts and Replacement Periods 5 10 5 8 Troubleshooting 5 11 5 8 1 Fault Indications 5 11 5 9 Replacement procedure of units 5 13 5 9 1 Replacement procedure of power amplifier 5 13 SECTION 6 WARRANTY AND REPAIR 6 1 Warranty 6 1 6 1 1 Warranty 6 1 6 1 2 Corrective action ...

Страница 25: ...or repair 6 5 6 2 3 1 Parts supply 6 5 6 2 3 2 Unit supply 6 6 6 2 3 3 Purchased Unit supply 6 6 6 2 3 4 Development of Replacement Unit 6 6 6 2 3 5 Confirmation of final volume needed 6 6 6 2 4 Supply of Parts Units and Purchased Units 6 6 6 3 Request to Our Customers for Assistance For Shorter Lead Times of Repairs 6 7 iv ...

Страница 26: ...SECTION 1 CAUTION AND SAFETY ...

Страница 27: ...hat has possibility of causing personal death or injury if not avoided HIGH VOLTAGE Supplied with 220V AC 1 Before removing the rear or side door of the transmitter for maintenance work turn OFF all the ACBs on the front panel of the transmitter 2 When removing the ACB panel on the front face of the transmitter turn the distribution board in the station OFF before the removal 3 At the time of main...

Страница 28: ...n any part of the transmitter wipe the splashes with a dry cloth 6 When tightening or loosening a flange of the piping be sure to use two wrenches If not so the piping may deform or twist 7 When pulling a PA out of the rack be sure to a disconnect input cable of the PA and put it away not to be damaged during the replacement work b turn off the AC breaker of the PA located behind cover c close the...

Страница 29: ... cause berylliosis a serious chronic lung disease Product should be disposed of in accordance with local regulations Disposing of your used NEC product In the European Union EU wide legislation as implemented in each Member State requires that used electrical and electronic products carrying the mark left must be disposed of separately from normal household waste This includes transmitter or elect...

Страница 30: ... or equal to 5819 7kVA at the interface point between the user s supply and the public system It is the responsibility of the installer or user the equipment to ensure by consultation with the distribution network operator if necessary that the equipment is connected only to a supply with a short circuit power sc S greater than or equal to 5819 7kVA 1 4 ...

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Страница 39: ...SECTION 2 GENERAL INFORMATION ...

Страница 40: ...features are as follows 1 Easy conversion to digital TX NEC has come up with a new digitalized exciter that enables easy conversion from analog to digital through the replacement of software in our newest transmitter series 2 High Performance Exciter Nonlinear distortions are corrected at the Video stages Among the nonlinear parameters are the luminance nonlinear distortion the differential gain D...

Страница 41: ...LCD display ensures a user friendly man machine interface 6 Ease of Operation and user friendly monitoring Equipped with a display panel LCD Display for visually displaying operating and trouble statuses for the operator so as to be perceptible at a glance Besides the LCD Display the trouble displaying functions are distributed among several units VHF Exciter VHF PA Power Amplifier unit The TX con...

Страница 42: ...W 15 15kW 17 17kW 20 20kW 30 30kW 35 35kW 40 40kW b System type SS Single Transmitter with Single Drive SSP Single Transmitter with Dual Drive Multiple PAs and Dual Cooling SSPE Single Transmitter with Dual Drive SSW Dual Transmitter in Active Reserve c Cooling Type Q Liquid cooling d Visual Aural Power Ratio 1 10 1 e Amplifier Mode Nil Separate Amplifier C Common Amplifier 2 3 ...

Страница 43: ...Cooling Dual Transmitter in Parallel Operation OUTLINE DIAGRAM Main Stand by exciters are switched automatically in case of trouble on main exciter EXCITER OPERATION SYSTEM 1 set Single Operation 2 sets Passive Reserve Operation 2 sets Passive Reserve Operation COOLING SYSTEM Single Operation Passive Reserve Operation Each separate transmitter performs single operation GWP G22906 2 4 ...

Страница 44: ...ference Power supply Voltage Voltage stability Frequency stability Power consumption 220V 3phase 4wire 10 15 2 Approx kVA Dimension Width Height Depth Transmitter Rack 1 590mm 2000mm 1000mm Ambient requirement Temperature range Relative humidity Altitude Over the temperature range 0 C to 45 C Transmitter specifications are guaranteed 90 maximum As determined by your site location NOTE In the case ...

Страница 45: ...d continuous random noise 52dB r m s or better Weighted continuous random noise 60dB r m s or better Unwanted Radiations Spurious Radiation Harmonic Radiation 60dB below the carrier and power not exceeding 12mW The same limits as for the spurious radiation Linear Distortion Amplitude vs Frequency Response Refer to Fig A Refer to Fig B Refer to Fig C Refer to Fig D Group Delay vs Frequency Response...

Страница 46: ...e Within 5 at 4 43MHz Within 5 at 4 43MHz Within 5 at 3 58MHz Within 5 at 3 58MHz Peak Sync Output Stability Better than 2 for any picture level Black Level Stability Better than 2 5 for any picture level Incidental Phase Modulation During full sinusoidal modulation of the visual transmitter between 50 and 15 000Hz 46dB or less relative to 50kHz deviation Phase modulation less than 4 1 with automa...

Страница 47: ...5 5 5 26 Fig B ITU R Standard D Freq MHz Limits dB 4 33 0 1 30 4 23 to 1 25 20 1 25 to 0 75 0 5 0 75 0 5 4 0 0 5 0 5 1 5 0 to 1 5 0 5 0 5 1 5 Ref 3 0 to 4 5 0 5 1 0 6 0 0 5 4 0 6 5 20 RATE OF CHANGE 12dB MHz RATE OF CHANGE 2dB MHz fo 2 0 5 0 4 5 6 0MH z Fig C ITU R Standard I1 Freq MHz Limits dB 4 43 30 2 0 Ref 2 0 to 4 5 0 5 0 5 5 5 0 5 4 0 dB 2 0 2 4 6 8 10 12 14 16 18 20 1 5 2 2 26 6 0 to 6 5 0...

Страница 48: ... 065 0 075 0 1 0 2 0 4 to 1 0 0 4 to 1 0 Time µS 3 ringing f 5MHz Limits 1 0 Fig E Step response 10 11 7 5 10 11 7 5 Fig D ITU R Standard M Freq MHz Limits dB 3 58 42 3 58 to 1 25 20 1 25 to 0 75 0 5 0 75 0 5 4 0 0 5 0 5 1 0 0 to 1 5 0 5 0 5 1 5 Ref 1 5 to 3 6 0 5 0 5 4 1 0 5 2 5 4 1 to 4 75 0 5 4 75 30 100 ITU R Standard B ITU R Standard D Rising time Less than 0 15µS Less than 0 13µS 8 8 8 G K 2...

Страница 49: ...han 30dB between 30Hz and 120kHz Modulation Capability Up to 100kHz deviation FM Noise 55dB or better relative to 100 mod at 400Hz 49dB or better relative to 100 mod at 400Hz AM Noise with no mod Synchronous AM Noise with 100 mod 45dB or better 40dB or better Amplitude vs Frequency Response with 50 mod Within 0 5dB between 30Hz and 15 000Hz of 50µS ideal pre emphasis curve Within 0 5dB between 30 ...

Страница 50: ...f the transmitter are grouped easily into the following five circuit sections in which equipment units and panels with their type names are shown in the following tables 1 Exciter Section Q ty 1 DM 3100AB Exciter 2 2 HPC 1558 Exciter Switch 1 2 Power Amplifier Section Q ty 1 VA3000QE PA Unit 12 2 6 Way Divider 2 3 6 Way Combiner 2 3 Control and Monitor Section Q ty 1 HPB 1508 TX Control Unit 2 2 H...

Страница 51: ...GWP G22906 4 Cooling Equipment Section Q ty 1 Pump Rack 2 2 ACB Panel for H EXC 2 3 Heat Exchanger 2 5 Coaxial Equipment Section Q ty 1 Low Pass Filter 2 2 Band pass Filter 2 2 12 ...

Страница 52: ...smitter are shown in Fig 2 1 The PCN 1800N Transmitter up to 20kW is mounted in one rack which accommodates exciters PAs and control unit Fig 2 1 Outside View of the PCN 1800N series Transmitter PCN 1805SSQN 1C 5kW Single transmitter PCN 1820SSPQN 1C 20kW Dual Exciter transmitter 2 13 ...

Страница 53: ...SECTION 3 FUNCTIONAL DESCRIPTION ...

Страница 54: ...pply EXCITER CIRCUITS See 3 1 TS OUTPUT FILTER See 3 4 To Antenna POWER AMPLIFIER See 3 2 TRANSMITTER CONTROL SYSTEM See 3 5 COOLING SYSTEM See 3 3 Fig 3 1 a Block Diagram of TV Transmitter S type Power Supply EXCITER CIRCUITS See 3 1 TS To Antenna TRANSMITTER CONTROL SYSTEM See 3 5 COOLING SYSTEM See 3 3 EXCITER CIRCUITS See 3 1 TS OUTPUT FILTER See 3 4 POWER AMPLIFIER See 3 2 EXCITER CIRCUIT See...

Страница 55: ...onverted to analogue then converted to RF directly by the quadrature modulation circuit AGC is done at RF stage The AGC circuit for visual is of the pedestal type operating to hold the pedestal or black level constant If there is no modulation present the AGC is automatically switched OFF The AGC circuit for aural is of the average power type The gain variation that can be controlled by AGC is res...

Страница 56: ...onnector Precorrection of nonlinearity 1 volt p p composite 75 ohms unbalanced BNC J ICPM correction Sync level PM 10 White level PM 5 Video correction Black level DG 5 White level DG 5 Black level DP 5 White level DP 5 Luminance linearity 10 White or black level Aural Characteristics Input Signal Frequency Deviation Frequency Response Distortion FM Noise 4dBm 16dBm audio for 50kHz deviation 10dBm...

Страница 57: ...GWP G22906 3 1 3 Exciter Switch Exciter switch is composed of relays for switching visual signal and for switching aural signal Changeover is executed by a command from the TX Control 3 4 ...

Страница 58: ...000QE Power Amplifier The VA3000QE is a power amplifier of peak output power 2000W which is used for common amplification of Analog TX Unit gain is approximately 76dB The gain can continuously be varied by the input variable attenuator LEVEL ADJ 3 5 ...

Страница 59: ...input protection Temperature protection Load variation coverage RF power output RF power input Gain Power supply voltage Power supply Approx 2dB at rated input power Automatic output interruption at 80 C Non abnormal operation in short time open or short circuit 2000W sync peak 0 05mW sync peak 76dB 200 208 230V AC 3phase 102A50V build in main body Channel coverage One channel specified within 170...

Страница 60: ... Instruction Manual of liquid cooling system HO2 344491 2 Pump Rack HO2 344492 2 in section 6 and Heat Balance in 1 General of Vol II 3 4 Output Section This section consists of the low pass filter for rejecting the spurious of the outputs of the power amplifier section Fig 3 7 shows the schematic diagram of this section Output of PA LOW PASS FILTER Output Antenna Fig 3 7 Schematic Diagram Table 3...

Страница 61: ...d Each of the controlled circuit sections of the transmitter sends out or receives number of status signal via solid state relays and electromagnet switches The transmitter employs a mechanical interlock system so that its component units are switched ON or OFF in only a given sequence This interlock system is incorporated as the decision circuit in the logic circuits of the TX Control Unit 3 5 3 ...

Страница 62: ...EMOTE MODE Yes LOCAL LED lights No Yes LOCAL LED lights TX ON LED lights START LOCAL LOCAL TX ON REMOTE TX ON ON CONT MEMORY EXTERNAL INTERLOCK RECYCLING HOLD COOLING ON PA PS ON COMMUNICATION WITH PA OK No Yes RF ON END Fig 3 8 Flow Chart of ON Control 3 9 ...

Страница 63: ...ONTROL LOCAL No REMOTE MODE Yes ON CONT MEMORY OFF START REMOTE LED lights LOCAL LED lights END PA PS OFF COOLING OFF DELAY 39sec Yes No TX ON LED goes off LOCAL TX ON REMOTE TX ON Fig 3 9 Flow Chart of OFF Control 3 10 ...

Страница 64: ...m The exciter section and the cooling section both adopting the stand by systems are controlled Stand by systems are only P type TX 3 If this kind of fault is encountered the transmitter is not stopped coercively however the signals informing a fault must be sent to the external circuit When a fault is encountered at a transmitter the sensor detects the fault and transmits the response to the TX c...

Страница 65: ...lant temperature is over the set temp PA PA PS TX OFF 4 COOLANT PRESSURE The coolant pressure is abnormal PA TX OFF after 20sec 5 COOLANT EMPTY The coolant tank on the pump rack has become empty PUMP PUMP OFF TX OFF Faults which if encountered will cause indication only see Table 3 5 When one of these faults is encountered the TX control unit will hold the LED indication ALARM on the operation pan...

Страница 66: ... to be abnormal 3 Output Power The output power of the transmitter rises by 0 8dB or lowers by 1 0dB b Reset To reset the transmitter after one of the faults described in item a above is encountered depress the Reset switch to restart the transmitter and extinguish the LED indication on the operation panel It should be noted however that although reset can be carried out in both Local on the opera...

Страница 67: ...ut start stop of the transmitter Setting of the output frequency and clock time is made on TX Control Fig 3 10 shows visual appearance of the front of TX Control The procedure of the operation on this panel is described in section 4 Operation and Adjustment in detail Fig 3 10 1 Outside View of TX Control S Type Fig 3 10 2 Outside View of TX Control P Type 1 2 1 4 2 5 3 6 7 5 8 3 7 8 9 10 11 6 12 9...

Страница 68: ...L mode 6 RESET switch For alarm reset 7 CPU RESET switch For CPU reset of the TX control 8 MENU switch For display MENU screen 9 ESC switch For quit previous operation or return to previous screen 10 OPTION switch For display setting screen with ESC switch 11 SELECT switch For move cursor to select items and determine items 1 12 EX A select switch For select EX A 1 13 EX B select switch For select...

Страница 69: ...nsmitter Amber indication 7 TX ALARM Some alarms occur in the Transmitter Red indication 8 CPU ALARM Indicates the CPU is fault condition Red indication 1 9 EX A Indicates the Exciter A is in use Amber indication 1 10 EX B Indicates the Exciter B is in use Amber indication 2 11 PUMP A Indicates the Pump A is in use Amber indication 2 12 PUMP B Indicates the Pump B is in use Amber indication Note 1...

Страница 70: ...orporates an output power Lower and Higher detect circuit and in case the output power is not normal an output power fault answer is sent to the TX control section The monitor section is also furnished with telemetry playing an important role in the control and monitoring of the transmitter The parameters of each PA are sent to the TX control section EXCITER TS INPUT PA 1 PA n OUTPUT TX CONTROL di...

Страница 71: ...e Table 3 6 Table 3 6 Connect for AC Line No Item Transferred through Remarks 1 AC supply voltage F101 AC Line directly is connected to L1 L2 L3 N PE of Line side 2 PA Power Amplifier ACB101 supply voltage 3 x 220V 3 EX and Control ACB201 and TB101 N TB101 N is the neutral terminal of the transmitter 4 Ground Terminal TB301 TB301 is the ground terminal of the transmitter Notice In case of 3 phase ...

Страница 72: ... the 75Ω transmitting video signal to the exciter 2 10MHz IN J002 The reference frequency input 3 Audio IN J003 J004 600Ω audio signal to the exciter 3 7 3 RF Monitor See Table 3 8 Table 3 8 Connectors for 50Ω RF Monitor No Item Transferred through Remarks 1 TX MON J110 The output power of the visual and aural output powers from the transmitter output 3 19 ...

Страница 73: ...h external control equipment through an interface board The interface board is shown in Fig 3 12 The interface board is mounted on the rear side of the transmitter Fig 3 12 Outside View of Interface Board J1 Parallel interface Command J4 Serial Communication on Interface RS 485 for daisy chain J3 Serial Communication on Interface RS 232C 485 J2 Parallel interface Status J5 System Control 3 20 ...

Страница 74: ...ation sent out to remote site is released 4 EX A Select 1 4 15 16 Command to select the EX A 5 EX B Select 1 5 15 16 Command to select the EX B 6 COOLING A Select 2 6 15 16 Command to select the BLOWER PUMP A 7 COOLING B Select 2 7 15 16 Command to select the BLOWER PUMP B 8 H EXC A Select 3 8 15 16 Command to select the H EXC A 9 H EXC B Select 3 9 15 16 Command to select the H EXC B 10 AUTO ON C...

Страница 75: ...S 1 23 30 31 Means that the exciter B is in use 20 COOLING A USE ANS 2 24 30 31 Means that the blower pump A is in use 21 COOLING B USE ANS 2 25 30 31 Means that the blower pump B is in use 22 H EXC A USE ANS 3 26 30 31 Means that the H EXC A is in use 23 H EXC B USE ANS 3 27 30 31 Means that the H EXC B is in use Note 1 Provided only when the exciter control is of changeover type of passive reser...

Страница 76: ...abnormal 7 EX SW FAULT 7 41 42 Exciter switch is under the abnormal condition 8 V OUTPUT FAULT 8 41 42 The visual output power is out of the specified range 9 A OUTPUT FAULT 9 41 42 The aural output power is out of the specified range 10 V REFLECT FAULT 10 41 42 Matching between the visual power combiner and succeeding load is not good 11 A REFLECT FAULT 11 41 42 Matching between the aural power c...

Страница 77: ...s of PA is over preset temperature 21 A PA TEMP FAULT 21 41 42 22 PRESSURE FAULT 22 41 42 Means that the pressure of the air coolant became lower than the set point 23 COOLING A FAULT 23 41 42 The air pressure The coolant pressure in the pump is abnormal 24 COOLING B FAULT 24 41 42 25 COOLING A AC FAULT 25 41 42 Over current occurred in AC input of the water pump causing the thermal relay to actua...

Страница 78: ...h is connected to the transmitter have been abnormal 36 TOTAL ALARM 36 41 42 Some fault occurred in the transmitter 37 TOTAL WARNING 37 41 42 Means that some minor fault occurred in the transmitter 38 TX CONT CPU FAULT 38 41 42 Means that the CPU of the TX control is abnormal 39 COMMUNICATION FAULT 39 41 42 Means that communications between the TX control and the PA is abnormal 40 DC PS FAULT 40 4...

Страница 79: ... output data displayed on the LCD display The method of setting and specifications related to serial communications are described below 1 Setting of hardware 1 Setting of jumpers Jumpers on the main board in the TX control unit are set as follows For positions of jumpers on the main board see Fig 3 8 a JS507 JS510 JS511 JS512 JS513 JS514 JS515 1 2 RS 232C 2 3 RS 485 b JS508 JS509 1 2 RS 485 with t...

Страница 80: ...ary switch 7 6 5 4 3 2 1 0 SW Position Baud Rate 0 1200bps 1 2400bps 2 4800bps 3 9600bps 4 19200bps 5 38400bps 6 57600bps 7 115200bps b SW3 DIP switch 8 7 6 5 4 3 2 1 2 1 Serial control 0 0 enabled 0 1 disabled Note 1 ON 0 OPEN 1 RTS CTS control enabled 0 RTS CTS control disabled 1 DTR DSR control enabled 0 DTR DSR control disabled 1 RS 232C 0 RS 485 3 27 ...

Страница 81: ...ll out the TX control unit remove six screws in the arrow marked positions and remove the top cover Fig 3 13 Control Board with Top Cover of the TX Control Unit Removed Positions of jumpers on the control board 3 28 ...

Страница 82: ...RFACE BOARD Pin No Signal 1 2 Receive Data RXD 3 Transmit Data TXD 4 Data Terminal Ready DTR 5 Ground 6 Data Set Ready DSR 7 Request to Send RTS 8 Clear to send CTS 9 2 RS 485 Table 3 12 REMOTE CONTROL J3 on INTERFACE BOARD Pin No Signal 1 2 3 Transmit Data TXD 4 Transmit Data TXD 5 Ground 6 Receive Data RXD 7 Receive Data RXD 8 9 3 29 ...

Страница 83: ...GWP G22906 Table 3 13 REMOTE CONTROL J4 on INTERFACE BOARD for daisy chain Pin No Signal 1 2 3 Transmit Data TXD 4 Transmit Data TXD 5 Ground 6 Receive Data RXD 7 Receive Data RXD 8 9 3 30 ...

Страница 84: ...INTERFACE BOARD TX D TX D RX D RX D GND TX D TX D RX D RX D GND to next equipment from previous equipment Connection for 2 wire TX J3 J4 3 4 6 5 4 3 7 5 INTERFACE BOARD TX D RX D TX D RX D GND GND to next equipment from previous equipment TX D RX D TX D RX D 3 31 ...

Страница 85: ...eleased 4 AGC OFF CONT 4 14 15 Command to cut off the AGC circuit when another transmitter is shut down 5 EX A AGC OFF CONT 9 14 15 Command to cut off the A AGC circuit when another transmitter is shut down 6 EX CHANGE SET 5 14 15 Sends out the EX CHANGE signal as an exciter changeover signal when the exciter in use came to a fault 7 PA RF OFF CONT 6 14 15 Command to cut off the PA OUTPUT when exc...

Страница 86: ...X CH CONT 27 34 35 Sends out the EX CHANGE signal as an exciter changeover signal when the exciter in use came to a fault 19 EX IF INPUT 28 34 35 When a signal is entered into the exciter IF INPUT the IF INPUT signal is sent out 20 EXCITER FAULT NON LATCH 29 34 35 Output level of the exciter is 3dB below the preset level 21 PA OUTPUT FAULT 32 34 35 The output power of some visual PAs is 2dB below ...

Страница 87: ...mitter is set up Table 3 15 b Connectors for Others No Item TB2 on the Interface Board Terminal No Description 1 D S STEREO CONT 1 4 Control for selection of stereo mode 2 D S DUAL CONT 2 4 Control for selection of dual sound mode 3 D S MONO ANS 5 8 EXCITER is monaural mode ans 4 D S STEREO ANS 6 8 EXCITER is stereo mode ans 5 D S DUAL ANS 7 8 EXCITER is dual sound mode ans Note These items are go...

Страница 88: ...SECTION 4 OPERATION AND ADJUSTMENTS ...

Страница 89: ... electrical continuity of each cable connected across the earth terminal and grounding bus 4 Check all component parts for damage caused in transit 5 Check all external connections for proper polarity and wiring 6 Check that the commercial power supply voltage is proper 7 Check that the functions of all protective circuits and relays are satisfactory 8 In performing manual checks and adjustments b...

Страница 90: ...for preventing erroneous operation in RF power transmission etc with the output being open or when the coaxial route connection is not proper Accordingly this function operates in either Local or Remote mode Additional Interlock Connections It is necessary for terminal TB1 1 2 on the HPC 1556 INTERFACE BOARD to receive closed contact when the external circuitry is in a good condition When for exam...

Страница 91: ...06 Designation and function of the components 1 Transmitter Front Panel See Fig 4 1 Fig 4 1 Front View of the Transmitter 1 2 3 6 5 4 for PA rear side of PANEL Internal for TX CONTROL Internal for EXCITER 7 4 3 ...

Страница 92: ... in ON position 5 CONTROL Internal Power ON OFF switch of breaker PS Normally this switch must be in ON position Amber LED for indication of power ON lights up when ON is selected and TX CONTROL units are normally 6 REMOTE REMOTE selector switch of TX Control Normally this switch must be in REMOTE mode Amber LED for indication of REMOTE lights up when REMOTE is selected 7 TX ON TX ON control switc...

Страница 93: ...GWP G22906 Transmitter s Meter See Fig 4 2 4 3 Fig 4 2 Transmitter Front View 8 Operation Panel of TX CONTROL 4 5 ...

Страница 94: ...GWP G22906 Fig 4 3 Transmitter Rear view 9 4 6 ...

Страница 95: ...l value ii TX STATUS Select TX STATUS function LCD display indicates each STATUS of transmitter iii PA STATUS Select PA STSTUS function LCD display indicates forward power reflected power temperature of PA coupling level of MONITOR drain DC voltage Drive PAs drain current Final stage PAs drain current of each PA individually Each item is indicated by numerical value iv COOLING STATUS Select COOLIN...

Страница 96: ... panel is shown in Fig 4 4 1 For the local control make the operation while pressing the CONTROL switch 2 If the TX RESET is made when the CPU alarm is lighting the CPU alarm is also reset at the same time 3 When on the operation panel the REMOTE mode is chosen the external control becomes possible and the control on the operation panel becomes impossible 4 The alarm indication on the operation pa...

Страница 97: ...elect REMOTE mode 5 LOCAL select switch For select LOCAL mode 6 RESET switch For alarm reset 1 7 EX A select switch For select EX A 1 8 EX B select switch For select EX B 2 9 PUMP A select switch For select PUMP A 2 10 PUMP B select switch For select PUMP B 3 11 H EXC A select switch For select H EXC A 3 12 H EXC B select switch For select H EXC B 13 CPU RESET switch For CPU reset of the TX contro...

Страница 98: ...PU is fault condition Red indication 1 9 EX A Indicates the Exciter A is in use Amber indication 1 10 EX B Indicates the Exciter B is in use Amber indication 2 11 PUMP A Indicates the Pump A is in use Amber indication 2 12 PUMP B Indicates the Pump B is in use Amber indication 3 13 H EXC A Indicates the H EXC A is in use Amber indication 3 14 H EXC B Indicates the H EXC B is in use Amber indicatio...

Страница 99: ...tion panel while simultaneously pushing the CONTROL switch In response the REMOTE LED lights 3 MAINTENANCE mode Only use for maintenance The MAINTENANCE mode is selected by pushing more than 3 seconds the CONTROL and LOCAL See Fig 4 5 In response the LOCAL and REMOTE LED blinks Note The MAINTENANCE mode allows the same operation as in the LOCAL mode except that the automatic change over control of...

Страница 100: ...rol When transmitter is remotely started the switch on the operation panel must be turned as shown in the Fig 4 6 a Operation Panel for TX Control REMOTE switch ON Amber LED lights TX ON switch ON Amber LED lights NOTE denotes LED is lit Fig 4 6 Operation Panel TX Control 4 12 ...

Страница 101: ...ration panel to LOCAL While simultaneously holding down the CONTROL switch Then push the TX ON witch while simultaneously holding down the CONTROL switch Thereupon PA PSs are turned on and the TX ON indication LED glows Amber To switch off push the TX OFF switch while simultaneously holding down the CONTROL switch The power is shut off Then the pump operates continuously for about 40 seconds befor...

Страница 102: ...f HPC 1508 TX control unit Rotate the select SW move a cursor to DATE TIME and push the select SW Then edit and set date time When you move a cursor to ENTER and push the select SW the clock starts from the setting time 4 5 2 Setting of frequency rated output power and number of PA etc The necessary setting for operating the transmitter has been made by NEC before shipping from the factory However...

Страница 103: ...select SW ii Setting of OUTPUT POWER Such as the procedure of setting of frequency OUTPUT POWER should be selected 1W step After edit and set move a cursor to ENTER and push the select SW iii Setting of NUMBER OF PA Select NUMBER OF PA you could edit NUMBER OF RACK or NUMBER OF PA RACK NUMBER OF RACK should be selected 1 4 and NUMBER OF PA RACK should be selected 1 10 After setting parameters push...

Страница 104: ... G22906 4 6 Adjustments 4 6 1 Adjustment of TX meter and faults levels 1 Open the top panel of the HPC 1508 TX control unit Fig 4 6 Top View of HPC 1508 TX control unit removed top cover of front side 4 16 ...

Страница 105: ...thod of Adjustment 1 USE SET SW1113 Set to USE refer to right figure 2 Meter 0 Adjustment VR1102 Adjust each meter swing to 0 3 OUTPUT Meter CAL VR1103 Adjust to meter reading is 100 when the output power is at the rated level 4 USE SET SW1113 Set to SET refer to right figure 5 HIGH Alarm SW1107 Set to HIGH refer to right figure 6 HIGH set VR1106 Adjust meter to set fault value Set to normal power...

Страница 106: ...3 Adjust each meter swing to 0 3 REFLECT Meter CAL VR1124 Adjust to meter reading is 10 when 10dB of rated power inputs to reflected input of RF monitor 4 USE SET SW1116 Set to SET refer to right figure 5 HIGH set VR1127 Set to normal power progressive wave 14dB 6 USE SET SW1116 Set to USE refer to right figure Caution Digital TV transmitter uses V OUTPUT and V REFLECT ONLY 4 18 ...

Страница 107: ...GWP G22906 4 6 2 Adjustment of Exciter Unit Refer to Instruction Manual for DM 3100AB Exciter in Section 7 4 6 3 Adjustment of power Amplifier Refer to Instruction Manual for VA3000QE in Section 7 4 19 ...

Страница 108: ...SECTION 5 MAINTENANCE ...

Страница 109: ...peration 2 When pulling a PA out of the rack be sure to a disconnect input cable of the PA and put it away not to be damaged during the replacement work b turn off the AC breaker of the PA located behind Operation panel c close the PA valves located behind the PA at rear side of the rack 3 In case that a PA is stored to the storage or is shipped back to the repair center be sure to remove coolant ...

Страница 110: ...GWP G22906 5 2 How to Stop Operation See Figs 5 1 5 2 1 Operation Panel 2 Main Circuit Breaker PA 3 EX CONT Breaker Fig 5 1 Front View of the TV Transmitter 2 3 1 5 2 ...

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Содержание PCN-1815SSQN/1Cx2

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NEC PCN-1815SSQN/1Cx2, Инструкция по эксплуатации, Страница: 58 / 110

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Содержание PCN-1815SSQN/1Cx2

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