FMUser FU-300W User Manual
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FMUser FU-300W User Manual

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FU-300W
TV Transmitter
User's Manual
1
www.fmuser.org

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Summary of Contents for FMUser FU-300W

  • Page 1 FU-300W TV Transmitter User’s Manual www.fmuser.org...
  • Page 2 Please notice thisÿ 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.

  • Page 3: Table Of Contents

    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.

  • Page 4: Safety Notice

    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.

  • Page 5: Overview

    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.

  • Page 6: System Structure And Function

    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 "e 62dB 6. spurious output suppression "d- 60dB...

  • Page 7: Test Instrument

    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.

  • Page 8: Technical Specifications

    Wattmeter MODEL 43 Bird 0ÿ^1KW VSWRÿ 1.20 DLA-1000W 50© Attenuator DC-1GHz 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.

  • Page 9: Panel Function Description

    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 www.fmuser.org...

  • Page 10: Power On Sequence

    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.

  • Page 11: Direction For Operate And Display

    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, “%²”Key, “%¼ ”Key, “Select” Key, “Mode” Key for user to view and set modulate parameter.

  • Page 12: A/V Ratio

    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 “%²” or “%¼ ” key, When deviation appears at the middle, it means modulation frequency deviation ± 50KHz. When deviation at the full mark, it means ±...
  • Page 13 ÿ 1ÿ When setting the first “A”, user can press “Select” key changing it to “*”, and then, pressing “%²” or “%¼ ” key, changing to desired letter. ÿ 2ÿ When setting the second “A”, user can press “Select” key changing it to “*”, and then, pressing “%²”...
  • Page 14 RF Levelÿ Low RF Levelÿ Norm ATTÿ 0.0dB ATTÿ 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 “%²” or “%¼ ”...
  • Page 15 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.
  • Page 16 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.
  • Page 17 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. RF output is in normal status.

  • Page 18: Indicator Light

    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: amplifier current is normal. Warning: amplifier current is high, may cause RF power drop.
  • Page 19 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.

  • Page 20: Others

    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.

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