Page 1 HO2-344916-201 30KW VHF ANALOG TV TRANSMITTER PCN-1815SSQN/1Cｘ2 ＩＮＳＴＲＵＣＴＩＯＮ　ＭＡＮＵＡＬ VOL.Ⅰ NEC Corporation TOKYO,JAPAN...
Page 14 TV TRANSMITTER...
Page 15 GWP-G22906 INSTRUCTION MANUAL FOR PCN-1815SSQN/1C×2 30kW VHF TV TRANSMITTER ..HO2-344916-201 VOL. I PRELIMINARY INFORMATIONS 1. Caution and Safety HO2-344916-201 - First Aid in the operation of this equipment HTD-E-3561 2. General Information HO2-344916-201 3. Functional Description HO2-344916-201 4. Operation and Adjustments HO2-344916-201 5.
Page 16 GWP-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 -...
Page 17 GWP-T22247W01 HO1-349495-202 TABLE OF ABBREVIATION ABBREVIA ABBREVIA NAME NAME -TION -TION Aural, Audio CCIR International Radio Consultitive Committee Alternating Current Conuter Clockwise Circuit Breaker CIB (D) Constant Impedance Band AD Converter Pass (Diplexer) Adjust CIN (D) Constant Impedance Automatic Gain Control Notch (Diplexer) Alarm Channel...
Page 18 GWP-T22247W01 ABBREVIA ABBREVIA NAME NAME -TION -TION Diode FB, F/B Feed Back D, DIG Digital Flat Cable DA Converter FIFO First Input First Output Direct Current Filament Directional Coupler Filter DEMO Demodulator Finite impulse Response Detector Frequency Modulation Deviation Final Power Amplifier Differential Gain FREQ Frequency...
Page 19 GWP-T22247W01 ABBREVIA ABBREVIA NAME NAME -TION -TION Relay NVRAM Nonvolatile Randam Access Memory Klystron OCXO Oven Controlled Crystal Coil Oscillator Light Emitting Diode Offset Linear Detector Over Load Linear Over Load Relay LO, LOC Local Output Power Low Pass Filter Operation Low Tension Output Filter...
Page 20 GWP-T22247W01 ABBREVIA ABBREVIA NAME NAME -TION -TION Transistor S. RFRM Snchronized Waveform Reformed Stereo Phonic Resistor Studio to Transmitter Link Randam Access Memory Switch Rubidium Synchronized Waveform Remote Control Gate REF, REFL Reflect SYNC Synchronize Reference SYNTHE Synthesizer REGEN Re-Generator Remote Transformer Response...
Page 21 GWP-T22247W01 ABBREVIA ABBREVIA NAME NAME -TION -TION Visual, Video Variable Capacitor VCXO Voltage Controlled Crystal Oscillator Video Distribution Amplifier Variable Frequency Oscillator Very High Frequency Variable Resistor Vestigial Single Side Band VSBF Vestigial Single Side Band Filter VSWR Voltage Standing Wave Ratio Wire Circulator...
Page 22: Table Of Contents
GWP-G22906 INSTRUCTION MANUAL FOR PCN-1815SSQN/1C×2 30kW VHF TV TRANSMITTER ..HO2-344916-201 CONTENTS SECTION. 1 CAUTION AND SAFETY General ........................1-1 Cautions for Use ..................... 1-1 SECTION. 2 GENERAL INFORMATION Scope ........................2-1 General ........................2-1 Coding System ......................2-3 Principal Characteristics ..................2-5 Composition ......................
Page 23 GWP-G22906 Interface ........................3-18 3-7-1 AC Line ......................3-18 3-7-2 Signal Line ......................3-19 3-7-3 RF Monitor ......................3-19 3-7-4 Control Line ...................... 3-20 3-7-4-1 Parallel Interface ..................3-21 3-7-4-2 Serial Communication Interface .............. 3-26 3-7-5 System Control Interface .................. 3-32 3-7-6 Others ........................
Page 24 GWP-G22906 SECTION. 5 MAINTENANCE General ........................5-1 How to Stop Operation ................... 5-2 Transmitter Operation Log ..................5-4 Monthly Maintenance Services ................5-4 Semiannual and Annual Maintenance Services ............5-5 5-5-1 Transmitter Station ................... 5-5 5-5-2 Transmitter ......................5-6 5-5-3 Check of Soldering....................
Page 25 GWP-G22906 6-2-2 Duration of repair service ................. 6-5 6-2-2-1 Repair period ................... 6-5 6-2-3 Supply of Parts, Units and Purchased Units for 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 ............
Page 26: Section. 1 Caution And Safety
SECTION.1 CAUTION AND SAFETY...
Page 27: General
GWP-G22906 PCN-1815SSQN/1Cx2 VHF DIGITAL TV TRANSMITTER SECTION. 1 CAUTION AND SAFETY General This transmitter has a capacity capable of supplying energy up to 30kW at the maximum as the high-frequency output. Therefore, mishandling the transmitter may not only damage the equipment associated with the transmitter, but also cause injury or death of persons in access to live parts.
Page 28 GWP-G22906 (1) The VA3000QE PA is a heavy weight. When lifting or transferring this equipment, two or more persons should work to prevent personal injury and shock to the equipment by its accidental fall. Expresses condition of a possible danger that has possibility of causing a minor or medium trouble if not avoided, and also expresses dangerous condition supposed to cause material defects only.
Page 29 When you dispose of such products, please follow the agreements made by between you and NEC. The mark on the electrical and electronic products only applies to the current European Union Member States. Outside the European Union...
Page 30 GWP-G22906 ”Equipment complying with IEC 61000-3-12” “This equipment complies with IEC 61000-3-12 provided that the short-circuit power is greater than 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...
Page 39: Section. 2 General Information
SECTION.2 GENERAL INFORMATION...
Page 40: Scope
The major 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.
Page 41 GWP-G22906 (3) Compact Size Its compact size（down to 78% by comparison with our recently type）contributes to the effective use of the station building inside space. (4) High Reliability This transmitter series incorporates a function for monitoring the status of each component unit to prevent major faults from occurring and assure continuation of stable operation.
Page 42: Coding System
GWP-G22906 Coding System The coding system of the PCN-1800N series is as follows. N ／ d Analog TV Transmitters (VHF Band) : PCN-18 : Output Power 10kW 12kW 15kW 17kW 20kW 30kW 35kW 40kW : System type : 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...
Page 43 Table 2-1 System Configuration of TV Transmitter SS type SSP type SSW type TX TYPE Single Transmitter Single Transmitter with Redundancy Dual Transmitter in Parallel Operation (Single Exciter, Single Cooling) (Dual Exciter, Dual Cooling) OUTLINE DIAGRAM Main/Stand-by exciters are switched automatically in case of trouble on main exciter.
Page 44: Principal Characteristics
GWP-G22906 Principal Characteristics 2-4-1 Entire Transmitter Table 2-2 Power Output Visual 15kW×2 (Sync Peak) Aural 1.5kW*×2 (Average) : One specified channel in VHF Band Ⅲ Frequency range 7 − : ±1.0×10 Frequency stability over a period of 1 year with internal reference Power supply Voltage 220V,3phase,4wire...
Page 45 GWP-G22906 2-4-2 Specifications (1) Visual Transmitter 625-Line 625-Line 625-Line 525-Line Characteristics ITU-R ITU-R ITU-R ITU-R Standard-B/G Standard-D/K Standard-I Standard-M Class of Emission Operating Frequency One designated VHF TV channel in Band-Ⅲ Range Carrier Frequency 7 − ±1.0×10 over a period of 1 year Stability 50Ω...
Page 46 GWP-G22906 (continued) 625-Line 625-Line 625-Line 525-Line Characteristics ITU-R ITU-R ITU-R ITU-R Standard-B/G Standard-D/K Standard-I Standard-M Waveform Response Within 2%K rating 2T Pulse Within ±1% Line tilt (1%K rating) Within ±2% Field tilt (1%K rating) Nonlinear Distortion Within ±5% at 4.43MHz Within ±5% at Diff.
Page 47 GWP-G22906 (continued) Fig. A ITU-R Standard - B Freq. (MHz) 　　　　 Limits (dB) −2 − − 30 / － 4.43 −4 − − − 20 / － 4.43 to 1.25 −6 − − 0.5 / － 1.25 to 0.75 −8 −...
Page 48 GWP-G22906 (continued) Fig. D ITU-R Standard - M Freq. (MHz) 　　　　 Limits (dB) −2 − − 42 / － 3.58 −4 − − − 20 / － 3.58 to 1.25 −6 +0.5 / － − − 1.25 to 0.75 −8 +0.5 /...
Page 49 GWP-G22906 (2) Aural Transmitter 625-Line 625-Line 625-Line 525-Line Characteristics ITU-R ITU-R ITU-R ITU-R Standard-G Standard-K Standard-I Standard-M Class of Emission Output Power 1/10 of the output power of visual transmitter Operating Frequency One designated VHF TV channel in Band-Ⅲ Range Carrier Frequency 7 −...
Page 50: Composition
GWP-G22906 Composition It is recommended that operational personnel become familiar with the various components of the transmitter and their type names from both a functional and physical point of view. This will assist in the proper operation and maintenance of the transmitter. 2-5-1 Functional Composition Separate functions of the transmitter are grouped easily into the following five circuit...
Page 51 GWP-G22906 (4) Cooling Equipment Section Q’ty 1) Pump Rack 2) ACB Panel (for H. EXC) 3) Heat Exchanger (5) Coaxial Equipment Section Q’ty 1) Low Pass Filter 2) Band pass Filter 2 - 12...
Page 52: Physical Composition
GWP-G22906 2-5-2 Physical Composition Outside View of typical PCN-1800N series transmitter 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. PCN-1820SSPQN/1C PCN-1805SSQN/1C 20kW Dual Exciter transmitter 5kW Single transmitter Fig.
Page 53: Section. 3 Functional Description
SECTION.3 FUNCTIONAL DESCRIPTION...
Page 54 GWP-G22906 SECTION. 3 FUNCTIONAL DESCRIPTION This section furnishes the operator with sufficient information pertaining to the functions of the PCN-1800N series by reference to the circuit sections introduced in 2-5, as well as to the block diagram of Fig. 3-1. EXCITER POWER OUTPUT...
Page 55: Exciter Section
GWP-G22906 Exciter Section The exciter section is composed of DM-3100AB Exciter and Exciter switch. In the case of single transmitter exciter switch is not applied. 3-1-1 DM-3100AB Exciter Principal features of the DM-3100AB Exciter are summarized below. (1) Digitalized modulation and linear and non-linear correction The visual VSB modulation, the white clip, the aural FM modulation and the linear and non-linear correction are executed at the digital base band.
Page 56: Characteristics
GWP-G22906 3-1-2 Characteristics Table 3-2 lists the electrical characteristics of the exciter Table 3-1 Electrical Characteristics Function Characteristics Overall Characteristics : Class of Modulation Visual : C3F negative modulation Aural : F3E Output Frequency One channel in band III Output Level Visual : 40mW sync peak Aural : 10mW Output Connector...
Page 57: Exciter Switch
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...
Page 58: Power Amplifier Section
GWP-G22906 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).
Page 59 GWP-G22906 Table 3-2 Electrical characteristics of VA3000QE PA for common amplification of Analog TX. Item Description Circuitry Transistor The number of cascade transistor stage External configuration 479(W) × 105 (H) × 630 (D) (*Not Include Front Panel) Dimension Weight Approx. 30kg (*Include Front Panel) Input connector BNC-J, front Output connector...
Page 60: Cooling Section
GWP-G22906 Cooling Section This transmitter is cooled with coolant fed from an external pump rack. The coolant which flows into the transmitter is branched to cool the PAs and then cools the resistors for the combiner and is discharged, combined again into one route, from the transmitter. For details, refer to the 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.
Page 61: Control Section
GWP-G22906 Control Section 3-5-1 General The transmitter is controlled mainly by the HPC-1508 TX Control. Two control modes, LOCAL and REMOTE, are provided. When the LOCAL mode is chosen, the transmitter is controlled on the operation panel mounted on the front panel of the transmitter, and does not accept external control.
Page 62 GWP-G22906 (1) ON CONTROL START No (REMOTE MODE) LOCAL “ LOCAL “ LED lights. “ LOCAL “ LED lights. LOCAL REMOTE TX ON TX ON ON CONT MEMORY EXTERNAL INTERLOCK “ INTERLOCK ” LED lights. RECYCLING HOLD PA PS ON COOLING ON COMMUNICATION WITH PA OK ?
Page 63 GWP-G22906 (2) OFF CONTROL START No (REMOTE MODE) LOCAL “ REMOTE ” LED lights “ LOCAL ” LED lights LOCAL REMOTE TX ON TX ON ON CONT MEMORY PA PS OFF “ TX ON ” LED goes off COOLING OFF DELAY 39sec Fig.
Page 64 GWP-G22906 (3) Control when a fault is encountered a) Faults A fault of a transmitter is classified into three (3) kinds as follows: 1) When this kind of fault is encountered, the operation of a transmitter is stopped coercively. And the transmitter must be protected absolutely from this kind of fault.
Page 65 GWP-G22906 Table 3-4 Faults from which the transmitter must be protected Component to be Item Fault Condition Control Item Protected 1. PA TEMP The temperature on the chassis of the Faulty unit : OFF PA is over preset temperature. 2. REF The reflected power is over.
Page 66 GWP-G22906 Table 3-5 Faults which, if encountered, will cause indication only Item Fault Condition Remarks 1. Exciter The output level of the exciter lowers by Another exciter is selected. 3dB. 2. PA The output level of PA lowers by 2dB. Even when the output level of the exciter is not normal, the PA will not be determined to...
Page 67 GWP-G22906 3-5-4 Operation of Transmitter The operation of transmitter is carried out with front panel of TX Control composed of an LCD display that displays condition of the transmitter and, a operation button. that carries out start/stop of the transmitter. Setting of the output frequency and clock time is made on TX Control.
Page 68 GWP-G22906 • Control Switch «1» MASTER CONTROL switch : When operation any control or select switch, Operate this switch simultaneously. «2» TX ON control switch : For TX ON control. «3» TX OFF control switch : For TX OFF control. «4»...
Page 69 GWP-G22906 • Indicator <1> TX ON : Transmitter is in ON status (Amber indication) <2> REMOTE : Indicates the Remote mode (Amber indication) <3> LOCAL : Indicates the Local mode. (Red indication) <4> POWER-A/B : Indicates the TX Control is power on. (Amber indication) <5>...
Page 70: Monitoring Section
GWP-G22906 Monitoring Section This transmitter is provided with meters to allow output power check of the transmitter and parameters of each PA. The output power is detected by the detector circuit in the TX control unit and displayed by digital indication on LCD display. Further, monitor section incorporates 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.
Page 71: Interface
GWP-G22906 Interface This subsection describes connection of the transmitter to external equipment. For the interface position and wiring routes, refer to the description in General of Vol. II, and mechanical drawings. 3-7-1 AC Line (See Table 3-6) Table 3-6 Connect for AC Line Transferred Item Remarks...
Page 72: Signal Line
GWP-G22906 3-7-2 Signal Line (See Table 3-7) Table 3-7 Connectors for Signal on Interface Panel Transferred Item Remarks through Video IN (Line) J001 Passes the 75Ω transmitting video signal to the exciter. 10MHz IN J002 The reference frequency input Audio IN J003,J004 600Ω...
Page 73: Control Line
GWP-G22906 3-7-4 Control Line There are two types of interface for connection with external remote control, parallel (relay contact) type and serial communication type. Both types make interface with external control equipment through an interface board. The interface board is shown in Fig.
Page 74: Parallel Interface
GWP-G22906 3-7-4-1 Parallel Interface The connection of the parallel interface with remote control equipment is made using interface board connectors (J1 and J2). The control items are listed in Table 3-9 Table 3-9 Connectors for Remote control (Interface Board J1 to Remote control Equipment) Terminal No.
Page 75 GWP-G22906 Table 3-9 (continued) Terminal No. Item Description − EXT. INTERLOCK 30/31 The output power of the transmitter can be applied to external equipment. TX LOCAL ANS 30/31 TX Local Mode TX REMOTE ANS 30/31 TX Remote Mode TX ON ANS 30/31 Means the TX ON condition.
Page 76 GWP-G22906 Table 3-10 Connectors for Remote control (Interface Board J2 to Remote control Equipment) Terminal No. Item Description − 41/42 Means that the EX-A visual output power is EX-A V FAULT abnormal. 41/42 Means that the EX-B visual output power is EX-B V FAULT abnormal.
Page 77 GWP-G22906 Table 3-10 (continued) Terminal No. Item Description − V PA OUTPUT FAULT 41/42 The output power of some visual PAs is 4dB below the preset level. A PA OUTPUT FAULT 41/42 The output power of some aural PAs is 4dB below the preset level.
Page 78 GWP-G22906 Table 3-10 (continued) Terminal No. Item Description − WATER LEVEL LOW 41/42 Means that the quantity of coolant in the coolant tank on the pump rack decreased to a lower level than the set level. 41/42 Means that the coolant in the coolant tank WATER LEVEL on the pump rack was used up.
Page 79: Serial Communication Interface
GWP-G22906 3-7-4-2 Serial Communication Interface The connection of the serial communication interface with the remote control equipment is made by means of a connector of the interface board. The serial communication interface has a function to output data displayed on the LCD display.
Page 80 GWP-G22906 2) Setting of Rotary Switch & DIP Switch The Rotary switch (SW2) & DIP switch (SW3) on the main board in the TX control unit are set as follows. a) SW2 (Rotary switch) SW Position Baud Rate 1200bps 2400bps 4800bps 9600bps 19200bps...
Page 81 GWP-G22906 • Pull out the TX control unit, remove six screws in the arrow-marked positions, and remove the top cover. Positions of jumpers on the control board Fig. 3-13 Control Board (with Top Cover of the TX Control Unit Removed) 3 - 28...
Page 82 GWP-G22906 (2) Serial Communication Connection (See Fig. 3-12, Outside View of Interface Board.) 1) RS-232C Table 3-11 REMOTE CONTROL (J3) on INTERFACE BOARD Pin No. Signal Receive Data (RXD) Transmit Data (TXD) Data Terminal Ready (DTR) Ground Data Set Ready (DSR) Request to Send (RTS) Clear to send (CTS) 2) RS-485...
Page 83 GWP-G22906 Table 3-13 REMOTE CONTROL (J4) on INTERFACE BOARD for daisy chain Pin No. Signal Transmit Data + (TXD +) Transmit Data − (TXD −) Ground Receive Data + (RXD +) Receive Data − (RXD −) 3 - 30...
Page 84 GWP-G22906 (Connection for 4-wire) TX-D + TX-D + TX-D − TX-D − from previous next RX-D + RX-D + equipment equipment RX-D − RX-D − INTERFACE BOARD (Connection for 2-wire) TX-D + TX-D + /RX-D + /RX-D + TX-D − TX-D −...
Page 85: System Control Interface
GWP-G22906 3-7-5 System Control Interface (See Table 3-14) The external interfaces of control items relating to the transmitter are connected through a Interface board. A connector (J5) of the Interface board accepts control commands from the system control and also sends out transmitter status necessary for the system control.
Page 86 GWP-G22906 Table 3-14 (continued) J5 (on the Interface Item Board) Description Terminal No. − TX ON CONT 34/35 Means the reception of ON command MEMORY TX ON ANS 34/35 Means the TX ON condition. TX REMOTE ANS 34/35 TX Remote Mode Operation. PUMP ON ANS 34/35 Means the ON condition of PUMP.
Page 87: Others
GWP-G22906 3-7-6 Others (See Table 3-15) Table 3-15(a) Connectors for Others TB1 (on the Interface Board) Item Description Terminal No. − External Interlock Receives the close contact when the interlock circuit located outside the transmitter is set up. Table 3-15(b) Connectors for Others TB2 (on the Interface Board) Item...
Page 88: Section. 4 Operation And Adjustments
SECTION.4 OPERATION AND ADJUSTMENTS...
Page 89: General
GWP-G22906 SECTION. 4 OPERATION AND ADJUSTMENTS General This section describes the procedures for starting and stopping of the transmitter as well as the methods of adjustment of the component sections in the sequence of powering these sections. Before starting the equipment, inspect these sections for anything abnormal and correct or repair as required.
Page 90 GWP-G22906 CAUTION : One of conditions for start-up of transmitter is external interlock. Be care that if this condition is not satisfied, the transmitter can’t be started. Items of the external interlock are shown below. • Function The transmitter operation may be initiated by the external interlock signal which is passed through interface terminal TB1-1,2 on the HPC-1556 INTERFACE BOARD.
Page 91 GWP-G22906 • Designation and function of the components (1) Transmitter Front Panel (See Fig. 4-1) «1» «2» «4» (for PA , rear side of PANEL ) «6» «5» (Internal for TX CONTROL) «7» «3» (Internal for EXCITER) Fig. 4-1 Front View of the Transmitter 4 - 3...
Page 92 GWP-G22906 «1» MAIN (PA) ...... Power ON/OFF breaker of AC mains (PA). Normally, this breaker must be in ON position. «2» EX/CONT ......Power ON/OFF breaker of EX/CONT (Exciter and Controls). «3» EXCITER (Internal) ..Power ON/OFF switch of breaker PS. Normally, this switch must be in ON position.
Page 93 GWP-G22906 • Transmitter’s Meter (See Fig. 4-2,4-3) «8» Operation Panel of TX CONTROL Fig. 4-2 Transmitter Front View 4 - 5...
Page 94 GWP-G22906 «9» Fig. 4-3 Transmitter Rear view 4 - 6...
Page 95 GWP-G22906 «8» ....Operation Panel of TX CONTROL is control and monitoring Operation Panel of TX CONTROL panel for operating the transmitter. It has control switch (push- button type), LCD display, and LED indicators. Metering items can be monitored on the LCD display, as follows. “MONITOR”(Top View) Normally, LCD display indicates output power, reflected power, IM, MER.
Page 96: Operation Panel
GWP-G22906 Operation Panel The local control of the transmitter is carried out on the operation panel on the front of the TX Control. The operation panel has the following functions. • Selection of the control modes • Control of start/stop of the transmitter •...
Page 97 GWP-G22906 «5» «4» «2» «7» «9» «11» <3> <2> <1> <9> <11> <13> <8> <4> <5> <6> «8» «10» «12» «6» «1» «13» «3» <10> <12> <14> <7> Fig. 4-4 Front View of Operation Panel • Control Switch «1» master CONTROL switch : Make operations using any switches («2»...
Page 98 GWP-G22906 • Indicator <1> REMOTE : Indicates the Remote mode. (Amber indication) <2> LOCAL : Indicates the LOCAL mode. (Red indication) <3> TX ON : Transmitter is in ON status. (Amber indication) <4> POWER-A/B : Indicates the TX Control is power on. (Amber indication) <5>...
Page 99: Control Mode Selection
GWP-G22906 Control mode selection (1) LOCAL mode • The LOCAL mode is selected by pushing the LOCAL select switch on the operation panel while simultaneously pushing the “CONTROL” switch. (In response, the “LOCAL” LED lights.) (2) REMOTE mode • The REMOTE mode is selected by pushing the REMOTE select switch on the operation panel while simultaneously pushing the “CONTROL”...
Page 100: Starting And Stopping
GWP-G22906 Starting and Stopping (1) Starting or Stopping on a Remote Control 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 .....
Page 101 GWP-G22906 (2) Local control The LOCAL control mode is used when this transmitter is operating separately from other control systems or when there are no other control systems in use. To select local control, set LOCAL select switch on the operation panel to “LOCAL”. While simultaneously holding down the “CONTROL”...
Page 102: Setting
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, if any change becomes necessarily, follow the procedure described below.
Page 103 GWP-G22906 (i) Setting of FREQUENCY Move a cursor to Frequency and push select SW, frequency should be edited. RF frequency should be selected 1Hz step within 170000000 Hz ~ 230000000 Hz. After edit and set, move cursor to [ENTER] and push the select SW. (ii) Setting of OUTPUT POWER Such as the procedure of setting of frequency, OUTPUT POWER should be selected 1W step.
Page 104: Adjustments
GWP-G22906 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...
Page 105 GWP-G22906 2) Adjust some volumes of “V OUTPUT” for OUTPUT meter on the LCD display and TX O/P fault level as referred to the adjustment procedure(1). (Refer to Table 4-1) 3) Adjust some volumes of “V REFLECT” for REFLECT meter on the LCD display and TX R/P fault level as referred to the adjustment procedure(2).
Page 106 GWP-G22906 Table 4-2 Adjustment procedure (REFLECT) Setting Item SW/VR Set Value or Method of Adjustment (1) USE/SET SW1116 Set to USE. (refer to right figure ) (2) Meter 0 VR1123 Adjust each meter swing to 0. Adjustment (3) REFLECT VR1124 Adjust to meter reading is 10% when -10dB Meter CAL of rated power inputs to reflected input of RF...
Page 107: Adjustments Of Power Amplifier
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...
Page 108 SECTION.5 MAINTENANCE...
Page 109 GWP-G22906 SECTION. 5 MAINTENANCE General In order to achieve simultaneous transmission of TV broadcast signals of optimum quality, preventive maintenance services must be performed regularly to assure satisfactory operation of the PCN-1800N series TV Transmitter. Major troubles will be caused, at times, from minor, incipient malfunctions that are liable to be carelessly over looked.
Page 110 GWP-G22906 How to Stop Operation (See Figs. 5-1, 5-2) «3» «2» «1» «1» Operation Panel «2» Main Circuit Breaker (PA) «3» EX/CONT Breaker Fig. 5-1 Front View of the TV Transmitter 5 - 2...

NEC PCN-1815SSQN/1Cx2 Instruction Manual

Quick Links

Need help?

Questions and answers

Related Manuals for NEC PCN-1815SSQN/1Cx2

Summary of Contents for NEC PCN-1815SSQN/1Cx2

Table of Contents