Redundant fm transmitting system
阅读：130发布：2021-06-23
专利汇可以提供Redundant fm transmitting system专利检索，专利查询，专利分析的服务。并且A redundant FM or PM transmitting system in which two transmitters operating at the same carrier frequency are modulated by a common baseband input and the RF outputs are combined and applied to the antenna. A sample of the RF output from each of the transmitters is applied to a phase detector which develops a signal having a component representative of the phase differences in the carrier. The signal is used to phase lock the second transmitter to the first whereby the output of the transmitters can be combined without objectionable intermodulation distortion.，下面是Redundant fm transmitting system专利的具体信息内容。
1. A transmitting system comprising first and second transmitters each having its own oscillator for generating its carrier frequency, means for applying a baseband frequency to each of said transmitters whereby the output of each is modulated in accordance therewith, combining means for combining the modulated output of said transmitters, sampling means for sampling each of the signals applied to the combiner, phase detector means connected to said sampling means and serving to generate a control signal proportional to the phase difference between said sampled signals, and means responsive to said control signal for controlling the frequency of the oscillator of the second transmitter whereby the frequency of the second transmitter''s oscillator is locked to the frequency of the first transmitter''s oscillator.
2. A transmitting system as in claim 1 wherein said transmitters are frequency modulated by the baseband frequency.
3. A transmitting system as in claim 1 wherein said transmitters are phase modulated by the baseband frequency.
4. A transmitting system comprising first and second FM transmitters each having its own oscillator for generating its carrier frequency, at least said first transmitter including frequency control means for controlling the oscillator frequency, means for applying a baseband frequency to said transmitters whereby each frequency is modulated in accordance therewith, combining means for combining the modulated output of said transmitters, sampling means for sampling each of the signals applied to the combiner, phase detector means connected to said sampling means and serving to generate a control signal proportional to the phase difference between said sampled signals, and means responsive to said control signal for controlling the frequency of the oscillator of the second transmitter whereby the frequency of the second transmitter''s oscillator is locked to the frequency of the first transmitter''s oscillator.
5. A redundant FM transmitting system comprising first and second FM transmitters each having its own oscillator for generating its carrier frequency, each of said transmitters including frequency control means for controlling the oscillator frequency, means normally disconnecting the frequency control means of said second transmitter, means for applying a baseband frequency to said transmitters whereby each is modulated in accordance therewith, combining means for combining the FM output of said transmitters, sampling each of means for sampling the signals applied to the combiner, phase detector means connected to said sampling means and serving to generate a control signal proportional to the phase difference between said sampled signals, and means responsive to said control signal for controlling the frequency of the oscillator of the second transmitter whereby the frequency of the second transmitter''s oscillator is locked to the frequency of the first transmittEr''s oscillator.
6. A redundant FM transmitting system as in claim 5 including alarm means for operating said means normally disconnecting the frequency control means of said second transmitter to connect said frequency control means to said second transmitter, said alarm means connected to receive a signal generated within said first transmitter indicating failure of said first transmitter whereby the second transmitter independently provides an output signal during failure of the first transmitter.
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