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Emergency vehicle radio transmission system

  • US 4,764,978 A
  • Filed: 08/20/1987
  • Issued: 08/16/1988
  • Est. Priority Date: 08/20/1987
  • Status: Expired due to Fees
First Claim
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1. Emergency vehicle radio transmission system, comprising, in combination:

  • audio source means for providing an audio output to be broadcast;

    audio processor means for processing the output of the audio source means for broadcasting on AM frequencies and on FM frequencies;

    AM band comb frequency generator means for generating AM band frequencies;

    AM modulator means for modulating the amplitude of the processed audio output on the AM band frequencies;

    first amplifier means for amplifying the modulated audio output on the AM band frequencies;

    first antenna means for transmitting the amplified audio output on the AM band frequencies;

    FM band comb frequency generator means for generating FM band frequencies;

    FM modulator means for modulating the processed audio output on the generated FM band frequencies to provide a modulated FM output signal;

    second amplifier means for amplifying the FM output signal on the FM frequency band; and

    second antenna means for transmitting the amplifier FM output signal on the FM frequency band substantially simultaneously with the transmission on the AM band frequencies.

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