User's Manual

GLOSSARY OF TERMS

516.80540.UM-Rev. D 1-Jun-07 Page 36 of 38

FSK Frequency Shift Keying – Digital modulation (a form of FM)

where the carrier frequency is shifted above and below the

operating frequency (in discrete steps) in response to a

digital data input.

Full Duplex A dual frequency mode of operation in which transmission

and reception occur simultaneously.

GFSK Gaussian Filtered Frequency Shift Keying – A form of digital

modulation in which the baseband modulation signal is

filtered by a low-pass filter with a Guassian response prior to

modulating the carrier signal.

GPS Global Positioning System

Half Duplex A dual frequency mode of operation, which inhibits

simultaneous transmission and reception.

Image Frequency An unwanted frequency, which will produce an on-frequency

IF (Intermediate Frequency) signal.

Injection An injection signal is a signal used in frequency conversion

circuits, it is normally mixed with another signal to produce a

third signal (which is a sum or difference or the original

signal and the injection signal).

kbps kilobits per second (1 kbps=1000 bps)

LO Local Oscillator – An on-board oscillator used in frequency

conversion circuits.

Modular Design A design in which the major functional components are

separated into distinct modules.

MTU Maximum Transmission Unit. The largest number of bytes

of payload data a frame can carry not counting the frames in

the header and trailer.

Multi-path A radio propagation situation in which multiple RF (radio

frequency) signal paths exists between a transmitter and

receiver. These multiple paths or multi-path situations can

create significant distortion in the received signal.

NFEZ Near-Field Exclusion Zone

Noise Figure The “Figure of Merit” of an amplifier. Specifically, noise

figure is a measure of the degradation in SNR (signal-to-

noise ratio) between the input and output ports of a network.