Patent
Fast frequency hopping synthesizer
TLDR
In this paper, the output of a fast frequency hopping VCO is mixed with the output from a conventional slow acquisition frequency synthesizer to produce an IF which is applied to a frequency discriminator where the IF is compared with a reference IF to provide an error signal which is digitized and stored in a memory.Abstract:
The output of a fast frequency hopping VCO is mixed with the output of a conventional slow acquisition frequency synthesizer to produce an IF which is applied to a frequency discriminator where the IF is compared with a reference IF to provide an error signal which is digitized and stored in a memory. Subsequently, the error signal is applied together with a command signal to the VCO to obtain the desired frequency output.read more
Citations
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Patent
Method and apparatus for transmitting monitor data
TL;DR: In this paper, a method and apparatus for transmitting data from a monitoring station using frequency hopping and interval hopping is described, where the output frequency of a transmitter in the monitoring station is limited between a maximum output frequency and a minimum output frequency by comparing the retrieved random number to data limits stored in a memory in the transmitter and rejecting retrieved random numbers outside of the retrieved limits.
Patent
Automatic pretuning of a voltage controlled oscillator in a frequency synthesizer using successive approximation
TL;DR: In this article, a digital number stored in a digital register is converted to an analog voltage value and applied to the voltage controlled oscillator as the coarse tuning voltage, and a microprocessor can be used to adjust the value of the register, as well as provide additional functions such as reverse successive approximation when the synthesizer is switched from one frequency to another frequency.
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Wireless communication system for adapting to frequency drift
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Journal ArticleDOI
Spread Spectrum and Time Division Multiple Access Satellite Communications
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TL;DR: In this paper, a method for calibrating an adjustable frequency generator having a voltage-controlled oscillator which is preceded by a computer via a digital-to-analog converter is described.
References
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Patent
Synchronizer for frequency hopping receiver
TL;DR: In this paper, a receiver of a fast frequency hopping (FFH) system is synchronized with a transmitter in three phases from a starting condition where the frequency hopping local signal leads the received signal prior to synchronization.
Patent
Digital variable frequency oscillator
TL;DR: In this paper, a plural oscillator system with all the characteristics of an analog or variable frequency oscillator, but with the added capability of locking digitally to any frequency within its range.
Patent
Time and frequency control unit
TL;DR: In this article, a time and frequency control unit is proposed for compensating for long-term crystal oscillator drift and other errors in a reference oscillator signal by both coarse and fine (vernier) controlling.