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 FM500 TRANSMITTER The FM500 is an economical stand-alone transmitter that delivers the high level of performance required for today's demanding broadcast needs. Continuing Crown's reputation for high quality and reliability, the FM500 achieves versatility without compromising operating parameters. The FM500 is available in three configurations: The FM500E is a basic exciter for broadcasting composite audio and SCA signals. For a transmitter with high quality stereo generation, audio processing and peak-limiting, choose the FM500T. For operation as a translator, the FM500R includes a high sensitivity receiver with composite output to drive the exciter. The receiver includes automatic gain control in the mixer stage to maintain maximum signal-to-noise ratio and selectable band-pass ceramic filters for adjacent channel rejection. The unique Automatic Level Compensation (ALC) circuit protects the FM500 from voltage, temperature, and VSWR variations. If operating parameters move outside the safe operating range of transmitter components, the ALC automatically reduces output power to safe limits until normal conditions are restored. A summary of fault conditions and all metered conditions are available at the rear panel for remote monitoring. Key internal operating parameters are displayed on a front panel digital meter for rapid verification of the transmitter condition. Reliable operation is a major design criteria in the FM500. With Teflon circuit boards and heat spreaders in the RF chain, the unit functions with less heat and improved life span. A power supply, with switching voltage and power regulators for AC or DC operation, provides stability, flexibility, and reliability even when primary power fluctuates. Specifications:
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