Quantized radio modulation modes

digital representation of sampled analog signals

method of encoding digital data on multiple carrier frequencies

type of radio modulation

modulation scheme for transmissions

radio signal transmission method invented by Hedy Lamarr

Type of Data Encoding

form of signal modulation where the message information is encoded in the amplitude of a series of signal pulse

modulation technique to reduce signal interference

thumb|right|300px thumb|right|350px|Slight timing errors are compensated for by redundancy (engineering)|printing each line twice.

upright|thumb|ICOM IC-91AD handheld transceiver with the D-STAR UT-121 digital voice board installed

means of representing a modulation scheme in digital communications

multi-user version of OFDM digital modulation

form of signal modulation in which the message is encoded by transmitting a single pulse in one of various possible time shifts

type of continuous-phase frequency-shift keying

simplest form of amplitude-shift keying modulation; represents digital data as the presence or absence of a carrier wave

thumb|Radioteletype tuning indicator thumb|Tuning indicator on cathode ray tube Radioteletype (RTTY) is a telecommunications system consisting originally of two or more electromechanical teleprinters in different locations connected by radio rather than a wired link. Radioteletype evolved from earlier landline teleprinter operations that began in the mid-1800s. The US Navy Department successfully tested printing telegraphy between an airplane and ground radio station in 1922. Later that year, the Radio Corporation of America (RCA) successfully tested printing telegraphy via their Chatham, Mass

thumb|200px|right|A Spectrogram|waterfall display depicting several PSK31 transmissions at around 14.07 MHz. The green lines indicate a station that is transmitting.

open source amateur radio mode

software

thumb|A Waterfall plot|waterfall display showing FT8 in use on the [[40-meter band.]] FT8 (short for Franke–Taylor design, 8-FSK modulation) is a frequency shift keying digital mode of radio communication used by amateur radio operators worldwide. It was released on June 29, 2017, by its creators Joe Taylor, K1JT and Steve Franke, K9AN, as part of the WSJT software package.

Digital modulation scheme

measure used to quantify the performance of a digital radio transmitter or receiver

software

small plastic screan with 2 atchments one with HF/el . C 2008 Apple

represents an analog signal using only two levels

variation of frequency shift keying that uses more than two frequencies

measure to quantify the performance of a digital radio transmitter or receiver in a communications system using digital modulation

modulation technique used in IEEE 802.11b

Fldigi (short for Fast light digital) is a free and open-source program which allows an ordinary computer's sound card to be used as a simple two-way data modem. The software is mostly used by amateur radio operators who connect the microphone and headphone connections of an amateur radio SSB or FM transceiver to the computer's headphone and microphone connections, respectively.