RF-Building Blocks

Receivers

Transmitters

Transceivers

Glossary
APCO - A suite of standards for digital radio communications for use by federal, state/province and local public safety agencies in North America.
CFBL - Cartesian Feedback Loop: The section of a RF control system that uses feedback and self-correction to adjust its operation in-line with the desired signal output.
DCR / DCRx - Direct Conversion Receiver. Where the wanted RF signal is mixed down to a low-IF or zero-IF frequency.
DQPSK - Differential Quadrature Phase Shift Keying: a modulation technique in which the carrier can assume one of four phases, or symbol, represented by 2 bits.
FFSK - Fast Frequency Shift Keying: also known as Minimum Shift Keying (MSK) - A form of frequency modulation.
FSK - Frequency Shift Keying: a form of frequency modulation used to transmit two states of a signal each as separate frequencies.
GFSK - Gaussian Filtered Frequency Shift Keying: an FSK modulation scheme with a Gausian filtered output signal.
GMSK - Gaussian Minimum Shift Keying: a type of FSK that uses pre-modulation Gausian filtering to achieve high data rates in an FM communications channel bandwidth.
Modulation - The process of modulation of a carrier or signal for transmission, also the result of this process.
MSK - Minimum Shift Keying: continuous phase FSK modulation, also known as FFSK..
QAM - Quadrature Amplitude Modulation: a hybrid amplitude/phase modulation technique that requires less bandwidth than normal amplitude or phase modulation techniques.
RF - Radio Frequency: generally accepted to range from about 3k to about 300,000MHz.

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