FU-300W TV Transmitter User s Manual

FU-300W TV Transmitter User s Manual 1

Please notice this: 1. Read safety notice first. 2. A 50 Ohm dummy load or antenna and cable must be connected before turning power on, avoiding water going into the connecters or the cable. 3. Please read System Control Logic section to fully understand how the system works. 4. Please read the Power On Sequence. 2

Contents Safety Notice 1. Overview --------------------------------------------------------------------------------5 2. Technical Specifications --------------------------------------------------------------5 3. System Structure and Function------------------------------------------------------6 4. Test Instrument-------------------------------------------------------------------------7 5. Test and Maintenance -----------------------------------------------------------------8 6. Panel Function Description ---------------------------------------------------------8 7. Power on Sequence -------------------------------------------------------------------9 8. System Control Logic-----------------------------------------------------------------10 9. Direction for Operate and Display ------------------------------------------------10 10. Indicator light-------------------------------------------------------------------------2 11. Failures Check ----------------------------------------------------------------------2 3

Safety Notice 1. Please read the following safety points, in order to avoid the accidents and prevent the connecting machines to be broken. 2. Only the qualified maintenance workers can operate the service. 3. Prevent the fire and the bodily injury. a. Use the proper wire. If not, it will cause the fire and the bodily injury; b. Ensure the machine connect the ground. Please confirm whether the machine has connected the ground, through the wire and the lead, to prevent the electric shock; c. Use the proper fuse. Please use the stipulated type and rating fuse; d. Provide good ventilation. This machine adopts the natural convective radiation. Fix it correctly to keep it radiating well. 4. Please don t disassemble and repair by yourself when it s broken down. Please send to the professional service department to solve the problems. CAUTION:Please don t assemble the machine in the moist environment; Please don t assemble the machine in the easy exploding environment; Please don t repair by yourself. 4

1. Overview There are 4 types transmitter, 50W, 100W, 200W, 300W, in family TV transmitter. This kind of TV transmitter is excellent, combining with TV modulation and power amplifier. This TV transmitter is comprised of modulation cell and power amplifier cell; these two parts have separate control and display system. This TV transmitter provides a COM interface, which user can turn on or turn off TV transmitter by remote command. 2. Technical Specifications 2.1. Technical Index 2.1.1 Video Index 1. Video input impedance 75Ω 2. Video input level 1.0Vp-p 3. Video modulating rate 87.5% 4. deferential gain 2.5% 5. deferential phase 2 6. color/brightness delay 30ns 7. video response 0.75dB 8. video S/N 58dB(non coefficient added) 64dB(coefficient added) 2.1.2 Audio Index 1. audio input impedance 10KΩ(unbalance,lotus socket) 2. audio input level 0.775V 3. MAX audio freq deviation ±50KHz 4. Audio pre-emphasis 50us 5. audio frequency response ±0.5dB(40Hz ~ 15KHz) 6. audio distortion 1% 7. audio S/N 65dB 5

8. the distance between video and audio carrier 5.50MHz±500Hz 2.1.3 RF Index 1. RF frequency range 2. Frequency accuracy 5KHz 3. Total frequency deviation 20KHz 4 A/V ratio -8~-22dB(0.5dB step) 5 C/N 62dB 6. spurious output suppression -60dB 7. RF output impedance 50Ω 2.1.4 Others Power Voltage Heat dissipation AC200V~ AC250V 47Hz~63Hz Forced ventilation 2.2 Physical Specifications: RF output connector Casing Size L16/L27 4U(484mm 172mm 600mm) 19Inch Weight Ambient temperature 5 ~+40 Relative Humidity <95% Sea Level Height <4500m 3. System Structure and Function This TV transmitter is comprised of two general parts, modulation cell and power amplifier cell. Modulation cell contains power supply, modulation circuit, and control-display circuit; as the same, power amplifier cell includes power supply, power amplifier circuit, and control-display circuit (shown as figure 3-1). Modulation cell put audio and video signal on the carrier RF signal. This control-display 6

circuit only work for the modulation cell, user can set parameter via this part. Amplifier circuit contains preamp, power amplifier, and power monitor. The RF signal from modulation goes to rated power after this amplifier circuit. This part also has separate control-display circuit for listing the information as power, voltage, current, temperature, and showing working status. LCD Display Key Buttons Video Modulate Video Input Power Supply Audio Modulate Audio Input AC 220V Input Power Supply Preamp MCU Power Amplifier COM Interface LCD Display Key Buttons Power Monitor TV RF Output Figure 3-1 ZHC518A-50~300W TV transmitter Structure and function 4. Test Instrument Name Type Specification Manufacturer Television Generator TSG-271 Tektronix TV Monitoring Receiver PM5696 Philip Video Measurement Set VM700A Tektronix Audio Analyzer P1DD Audio Precision 7

Wattmeter MODEL 43 0~1KW Bird 50Ω Attenuator DLA-1000W VSWR<1.20 DC-1GHz BED Table 4-1 Test instrument for ZHC518A-50/100/200/300W TV transmitter 5. Test and Maintenance As a high performance and high index TV transmitter, ZHC518A-50/100/200/300W TV transmitter s relevant specifications such as distortion; audio frequency response, video frequency response, and signal to noise ratio etc. totally meet the national relevant standards and industry standards of TV transmitter, and some of their technical specifications is much higher than the national standards and industry standards. 5.1 Performance Test To ZHC515A family TV transmitter, video index and RF index need to be tested. a. Connect transmitter and test Instrument with cable according Figure 5-1. TV signal Video Video TV monitor generator measurement receiver Video RF ZHC518A TV transmitter RF Wattmeter RF Attenuator Figure 5-1 connecting for video index test b. Adjust the output level of modulation; make the output peak power, which is read from Wattmeter, to be rating power. c. Test the video index according 2.1. 5.2 Maintenance It needs to use new fans instead of the old ones which have worked more than 15000 hours. If 8

the digital FM broadcast transmitter works at a very dirty environment, for example a place with much of dust, it must be to replace fans ahead of schedule. 6. Panel Description 6.1 Front Panel 6.2 Back Panel 9

7. Power on Sequence 7.1 Open the package, check appearance, switch, key button, socket, and interface port on front and back panel. 7.2 Turn power switch on the OFF position and connect power cord to power source. 7.3 Connect audio, video, RF cable on the back panel. Connect RF out port to a 50 Ohm dummy load or antenna through a cable. 7.4 Turn power switch to ON at the back panel, then turn power switch to ON at the front panel. 7.5 Turn off RF power. 7.6 Set working parameters. 7.7 Turn on RF power. 8. System Control Logic 8.1 RF Output Control This TV transmitter s RF output can be controlled by RF Switch, which is on the Main Page of the LCD. When RF Switch is OFF, turn off RF power. When RF Switch is ON, and the video signal input is normal, turn RF power on. 8.2 Remote Control When remote control is enabled, remote LED on front panel is lit. And power output is controlled by remote host and can not be changed locally except Remote flag is disabled. RS232 or RS485 are used for remote control. User can ask either of this two. Before enabling remote control, baud rate and device address should be properly set. 8.3 System Protection In some urgent cases such as exceeded forward power, reflect power, current and over temperature, system will reboot. If it is failed successive 3 times, the system will automatically turns off RF power and just acts display function. 10

9. Direction for Operate and Display To this TV transmitter, modulation cell and power amplifier cell have separate operate-display system. 9.1 Operation for Modulation Cell On the front panel, there is a LCD, Key, Key, Select Key, Mode Key for user to view and set modulate parameter. 9.1.1 Video Modulating degree setting Single click Mode key on the front panel, putting LCD Display under paging status, and then,pressing or key, making window frame at Video MOD DEPTH: NO Signal&Input Video MOD DEPTH: 87.5% 图 1 图 2 If LCD displays picture 1, it means no video signal input. If LCD displays picture 2 and video is AGC status, modulating degree automatically changes to 87.5%. When video frequency modulation is under MGC status, user can properly adjust the potentiometer on the rear panel in order frequency modulation achieving perfect performance. 9.1.2 Audio Frequency Deviation Setting Single click Mode key on the front panel, putting LCD Display under paging status, and then,pressing or key, making window frame at Audio FREQ DEV: -------------------- Audio FREQ DEV: > > > > > >------- 图 1 图 2 11

If LCD displays picture 1, it means no audio signal input, If LCD displays picture 2, user can press Select key, entering variable status, and then, press or key, When deviation appears at the middle, it means modulation frequency deviation ±50KHz. When deviation at the full mark, it means ±100KHz. 9.1.3 A/V Ratio Setting Single click Mode key on the front panel, putting LCD Display under paging status, and then,pressing or key, making window frame at A/V Proportion: - 18.0 db User can press Select key, entering variable status, and then, pressing or key achieving desirable value, finally.(suggestion: keep the factory default setting) 9.1.4 Program Label Setting Single click Mode key on the front panel, putting LCD Display under paging status, and then,pressing or key, making window frame at Program: AAAAAAAA The factory default setting is 8 (A)s. If it is necessary to set program label, user can follow the steps below: 12

(1)When setting the first A, user can press Select key changing it to *, and then, pressing or key, changing to desired letter. (2)When setting the second A, user can press Select key changing it to *, and then, pressing or key, changing to desired letter. (3)Repeating step A or step B, until getting needed program label, finally pressing Mode to save the change. 9.1.5 Output Frequency Setting Single click Mode key on the front panel, putting LCD Display under paging status, and then,pressing or key, making window frame at Freque:543.25MHz Channel:22ch H Freque:543.25MHz Channel:22ch L Frequency: 543.25MHz is the video carrier frequency. Channel: 22ch means current channel is channel 22ch. H means frequency changing step is 8MHz or 7 MHz, L means frequency changing step is 0.25MHz. User can press Select key, entering variable status, and then, pressing or key achieving desirable carrier frequency,. 9.1.6 Output Level Setting Single click Mode key on the front panel, putting LCD Display under paging status, and then,pressing or key, making window frame at 13

RF Level:Low ATT:0.0dB RF Level:Norm ATT:0.0dB RF Level: Low in picture means no output or output level is too low. RF Level: Norm in Picture means output level is normal, ATT: 0.0dB means output attenuation. User can press Select key, entering variable status, and then pressing or key, until reaching user needed value, finally pressing Mode key saving the change. 9.2 Operation for Power Amplifier Cell There is LCD, Up key, Down Key, Enter key on the front panel for user to operate and view parameter of Amplifier Cell. :Up key. :Down key. :Enter key. User can select page and save parameter by this key. When there is no operation (press button) for a long time, system will return to its main menu automatically with LCD backlight off. Not saved updated parameter will be replaced with its old value. Pressing any key can turn on the LCD again. 9.2.1 System Boot Up Page Figure 9-1 Page of system boot up 14

During the system boot up, company logo is displayed and all LED on front panel blinks 4 times (power LED is on). After system booting up, it enters to the page displaying frequency and power set. 9.2.2 Main menu page Figure 9-2 Main menu page Figure 9-2 shows main menu page. This page contains the parameter as following: RF SWITCH: RF switch control select between ON or OFF. FWD POWER: forward power display only. RFL POWER: reflected power display only. AMP VOLTAGE: amplifier voltage display only. DRV CURRENT: preamp current display only. AMP CURRENT: power amplifier current display only. [VIEW] [STATUS] [SET] parameter data browse menu, see [VIEW] menu. system running status, see [STATUS] menu parameter setting menu, see [STATUS] menu. 9.2.3 VIEW Page 15

Figure 9-3 Page of VIEW Figure 9-3 shows the all parameters in the VIEW page. In the VIEW page, users can only browse the parameters. If users want to modify the parameters, it should to be enter the SET page. FWD POWER: RFL POWER: AMP VOLTAGE: DRV CURRENT: AMP CURRENT: TEMPERATURE: BAUDRATE: ADDRESS: REMOTE: [EXIT] forward power. reflected power. amplifier voltage. current of preamp. current of power amplifier. temperature of amplifier baud rate used for serial communication. device address used for remote control. remote control switch. return to its parent menu. 9.2.4 STATUS Page 16

Figure 9-4 Page of STATUS Two pictures in Figure 9-4 show the status of all parameters, users can find out the system is running normally or not. RF OUTPUT: ON/OFF; refer to control logic section. ON: OFF: SYSTEM: RF output is in normal status. RF power is off. Normal/Error Indicate system errors. Contact equipment provider when error happens. FWD POWER: Normal: Warning: Normal/Warning/Protect forward power is normal. forward power is higher than setting power. Protected: forward power is too high, RF power is turned off. RFL POWER: Normal: Warning: Normal/Warning/Protect/Protect H reflect power is normal. reflect power is high, may cause RF power drop. Protected: reflect power is too high, RF power is turned off. AMP VOLTAGE: Normal/Warning/Protect Normal: Warning: amplifier voltage is normal. amplifier voltage is high, may cause RF power drop. Protected: amplifier voltage is too high, RF power is turned off. DRV CURRENT: Normal/Warning/Protect Normal: preamp current is normal. 17

Warning: preamp current is high, may cause RF power drop. Protected: preamp current is too high, RF power is turned off. AMP CURRENT: Normal/Warning/Protect Normal: Warning: amplifier current is normal. amplifier current is high, may cause RF power drop. Protected: amplifier current is too high, RF power is turned off. TEMPERATURE: Normal/Warning/Protect Normal: Warning: temperature is normal. temperature is high, may cause RF power drop. Protected: temperature is too high, RF power is turned off. [EXIT] return to its parent menu. 9.2.5 SET Page Baud Rate: Address: Remote: [EXIT] Figure 9-5 Set Page select baud rate for remote control. set device address for remote control. enable or disable remote control. return to its parent menu. 10. Indicator light On the front panel, there are two lamps for modulation cell and eight for amplifier. 18

10.1 Lamp for Modulation Cell 10.1.1 Lamp for Power on When this lamp is luminous, it means the power supply for modulation cell is normal. 10.1.2 Lamp for Video AGC When video output is controlled by AGC, this lamp is light. 10.2 Lamp for Amplifier Cell 10.2.1 Lamp for Power on When it is power on, the voltage of 5V is supplied normally, this green lamp is luminous. 10.2.2 Lamp for RF When the RF SWITCH on the main menu is set to ON, this green lamp is light. 10.2.3 Lamp for Video While output power is normal, this lamp is light. 10.2.4 Lamp for REMOTE In the page of Set, if Remote is enabled, this yellow light is illuminant. 10.2.5 Lamp for TEMP When the amplifier temperature is higher than 70, if temperature exceeds 85,it will power off immediately. 10.2.6 Lamp for VSWR If reflected power is higher than 2% of rated power, the lamp is light; higher than 4% of power, it will decrease output power to decrease reflected power; when it is higher than 5%, it may happen that: the software power off the output, or the hardware circuit switch off the power supply, then power on again. 10.2.7 Lamp for GENERAL If this lamp is light, it may happen that: forward power is more than 101% of rated power, 19

preamp current or amplifier current is higher than normal value. if forward power is more than 110% of rated power, preamp current or amplifier current is too much higher than normal value. it will shut down at once. 10.2.8 Lamp for RF MUTE It means nothing for this mode of equipment. 11. Failure Check 11.1 Turn on the power supply, but the equipment doesn t work it may: The fuse is broken: change the fuse; The plug is not inserted tightly or contacted fault: insert the plug tightly. 11.2 No audio or video output The source of audio or video signal is not connected: check the wire to ensure it has been connected correctly. 11.3 Other Failure If there is any other problem that can not be solved, please contact with Zhongchuan digital equipment Co., Ltd. 20