Matches 1 - 7 out of 7
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6788922 Radio FM receiver having a frequency 2-divider and a frequency 3-divider for alternatively dividing a VCO signal for down-converting a received radio signal  
A radio FM receiver is provided with a voltage-controlled oscillator which can be connected via a frequency 2-divider to a quadrature combination circuit for transforming down the frequencies of...
4580276 System and method for transporting data  
A private local area network (LAN) is created for use with a variety of transmission media for the purpose of exchanging data preassigned addresses, and control signals according to simplified...
4569060 FSK Coding method and apparatus involving multiples and submultiples of a given frequency  
A method for coding a data signal for transmission and reception which includes the steps of generating a prefix signal which is a train of pulses at a multiple or submultiple of a selected...
4528675 FSK modem for bidirectional loop communications system  
A modem which utilizes a method and means for coding a data signal for transmission and reception which includes the steps of generating a prefix signal which is a train of pulses at a multiple or...
4484355 Handheld transceiver with frequency synthesizer and sub-audible tone squelch system  
A handheld transceiver providing separate selective communications links for transmission and reception on a single carrier frequency by means of independent carrier and sub-audible tone...
4389643 Multiplexed pulse tone signal receiving apparatus  
A multiplexed pulse tone receiving apparatus for receiving predetermined ones of multiplexed pulse tone signals of the type comprised of pulse tone signals of different tone frequencies, each tone...
4384288 Portable radio frequency emitting identifier  
An automatic identification system wherein a portable identifier, preferably shaped like a credit card, incorporates an oscillator and encoder so as to generate a programmable pulse...
Matches 1 - 7 out of 7