FREQUENCY MODULATION
(FM)

PHASE MODULATION
(PM)

WEAK SIGNAL PROPAGATION REPORTER (WSPR-X)

RADIO TELETYPE
(RTTY)

WEAK SIGNAL COMMUNICATIONS BY K1JT (WSJT-X)

JS8CALL

JT65

FT8

PACTOR

SLOW SCAN TV
(SSTV)

D-STAR

SPREAD SPECTRUM
