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General| Modulation Type | FM |
|---|---|
| Output Connector | BNC |
| Output Power | 30W |
| Input Impedance | 50 ohms |
| Frequency Range | 88-108 MHz |
Overview of the FM30, FM100, and FM250 broadcast transmitters, highlighting integration, ease-of-use, and reliability.
Describes various applications like stand-alone, backup, booster, translator, satellator, and nearcast, plus product configurations.
Details technical specifications including frequency range, RF power output, impedance, stability, audio levels, and distortion.
Provides technical specifications for the receiver option, including monaural and stereo sensitivity, and connector types.
Outlines safety guidelines, defining DANGER, WARNING, and CAUTION alerts to prevent injury or equipment damage.
Guidelines for installing the transmitter in a clean, well-ventilated area, with proper clearance for airflow.
Instructions for connecting AC and DC power, including setting the AC line voltage and fuse information.
Procedure for selecting the operating frequency using rotary switches on the RF Exciter board.
Instructions for setting the receiving or incoming frequency for transmitters equipped with the receiver option.
Details on connecting the RF load, antenna, or external power amplifier to the rear panel's Type-N connector.
Guidance on attaching audio inputs to the Left and Right XLR connectors, including pinout and impedance details.
Instructions for connecting external SCA generators to the rear panel's BNC connectors.
How to feed composite stereo or mono audio directly to the RF exciter, bypassing internal processors.
Information on using the Monitor jacks for studio monitors and audio testing, including de-emphasis settings.
Guidance on selecting the pre-emphasis curve via jumpers on the audio processor and stereo generator boards.
Enabling automatic carrier turn-off upon program failure, with adjustable time delays.
Details on the 15-pin D-sub connector for remote control and metering, including pinout.
Step-by-step guide for the initial operation of the transmitter, including power-up checks and parameter verification.
Explanation of the DC breaker, main power switch, and carrier switch functions.
Description of LED indicators for audio levels, gain control, modulation, and fault status.
How to set audio input sensitivity using the +6 dB and +12 dB slide switches.
Factors influencing the Processing control setting, affecting program density and music dynamics.
Selecting the transmission mode between Stereo and Mono operation.
Setting the desired RF output power level using the front panel control.
Explanation of the four-digit display and selectable parameters for transmitter monitoring.
Description of blinking red light indicators for SWR, Lock, Input, PA DC, and PA Temperature faults.
Explanation of the component part numbering scheme used for circuit boards and schematics.
Details the functions of the audio processor board, including compressor, limiter, expander, and pre-emphasis networks.
Explains how the stereo generator board creates a composite stereo signal from audio inputs.
Describes the RF Exciter or Frequency Synthesizer board, including VCO and PLL circuitry.
Details the ALC and metering circuitry, including RF/DC metering and bias generation.
Describes the motherboard's role in interconnecting circuit boards and providing power and filtering.
Explains the circuits for front panel LEDs, numeric display, and controls on the display board.
Details the voltage regulator board's switch-mode regulators and program detection circuits.
Explains the power regulator board's function in providing PA supply voltage and current metering.
Describes the RF driver/amplifier assembly for the FM30 model.
Describes the RF driver assembly for the FM100 and FM250 models.
Details the RF power amplifier assembly for the FM100 and FM250 models.
Discusses chassis components like AC power supply, bridge rectifier, and filter capacitor.
Explains the RF low-pass filter and reflectometer for harmonic attenuation and VSWR measurement.
Describes the receiver option for translator use, including tuner module and frequency selection.
Procedures for selecting and fine-tuning the pre-emphasis curve for audio processing.
Steps for adjusting stereo separation and composite output levels.
Guidance on frequency selection, modulation compensation, and measurement/adjustment.
Procedures for calibrating power, setting power output, and calibrating SWR.
Information on motherboard jumper configurations for options.
How to set the sensitivity of the front panel modulation bar graph display.
Setting time delays for program failure to carrier turnoff via JP701 header.
Procedure to set the Bias Set trim pot in the PA module for optimal bias.
Checklist of parameters for comprehensive transmitter performance characterization.
Methods for measuring and adjusting the carrier frequency according to FCC regulations.
How to measure and set the transmitter's output power using front panel display or watt meter.
Using an RF spectrum analyzer to observe bandwidth and spurious emissions.
Measuring and adjusting the 19-kHz pilot frequency for stereo transmissions.
Performing audio frequency response measurements using an FM modulation monitor.
Measuring audio distortion levels for left and right channels using an FM modulation monitor.
Confirming total modulation percentage constancy and measuring pilot modulation.
Taking noise readings from the de-emphasized output of a modulation monitor.
Measuring stereo separation between left and right channels with an FM modulation monitor.
Measuring stereo crosstalk between channels, requiring correction for level and phase imbalances.
Ensuring the 38-kHz subcarrier is suppressed to at least 40 dB below the indicated level.
Performing physical inspection, checking switches, indicators, frequency lock, and functional tests.
Illustrations showing the front and rear views of the FM transmitter, labeling key components and connectors.
Provides board layouts and detailed schematics for various circuit boards within the transmitter.
Procedure for obtaining warranty service, including contacting customer service and returning products.
Information on accessing 24-hour technical assistance via telephone for product support.
Contact information for obtaining spare parts, including sales numbers and mailing addresses.
Table showing PADC Volts, Amps, RF Power, and Efficiency for the FM30 transmitter.
Table showing PADC Volts, Amps, RF Power, and Efficiency for the FM100 transmitter.
Table showing PADC Volts, Amps, RF Power, and Efficiency for the FM250 transmitter.
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