Isizinda sesigaba yisijikelezo lapho isigaba segagasi senethiwekhi silawulwa yisiginali yokuguqula. Kunezinhlobo ezimbili zokushintshashintsha kwezigaba ze-Sine Waves: Ukushintshwa kwesigaba okuqondile nokuguquguquka kwesigaba esingaqondile. Umgomo wokuguquguquka kwesigaba esiqondile ukusebenzisa isiginali yokuguqula ukuguqula ngokuqondile amapharamitha we-loop resonant, ukuze isiginali yenkampani ethwala ngokuhamba kabusha kokushintsha isigaba nokwakha igagasi lesigaba; Indlela yokuguqulwa kwesigaba esingaqondile kuqala icubungula ukuthuthuka kwegagasi elilungisiwe, bese liguqula ushintsho lwe-amplitude ekushintsheni kwesigaba, ukuze kufinyelelwe ukuguquguquka kwesigaba. Le ndlela yadalwa yi-Armstrong ngo-1933, ibizwa nge-Armstrong Modulation Megament
Isigaba se-Microwave esilawulwa nge-microwave siyinethiwekhi etheku lesibili esetshenziselwa ukuhlinzeka umehluko wesigaba phakathi kokukhishwa kanye namasiginali wokufaka angalawulwa yisiginali yokulawula (ngokuvamile i-DC Bias Voltage). Inani lokushintshwa kwesigaba lingahluka ngokuqhubekayo ngesiginali yokulawula noma ngenani elinqunyiwe. Babizwa ngokuthi ama-analog esigaba Shift kanye nabaguquki besigaba sedijithali ngokulandelana. I-Modulator yesigaba yi-Binary Station Shift Keykulamisa i-Modulator ku-Microwave Communication System, esebenzisa igagasi eliqhubekayo lesikwele ukuguqula isiginali yenethiwekhi. Ukushintshwa kwesigaba se-Sine FAM kungahlukaniswa ukuze kuguqulwe isigaba esiqondile sokushintshwa kwesigaba kanye nesigaba esingaqondile. Ngokusebenzisa ubudlelwane e-Sine Wave Amplitude Angle i-Ampille ehlanganiswe imvamisa esheshayo, i-Frequency wave ingaguqulwa ibe yigagasi lesigaba (noma okuphambene nalokho). Umjikelezo wesigaba sokulinganisa esisetshenziswa kakhulu yi-Varactor Diode Isigaba Modulator. Umjikelezo wokuguqulwa kwesigaba esingaqondile uyinkimbinkimbi ngokwedlula umjikelezo wokuguquguquka kwesigaba esiqondile. Umgomo wawo ukuthi indlela eyodwa yesiginali yenethiwekhi iguqulwa yisigaba esingu-90 ° esishisiwe futhi ingena kwi-amplitude-modulator elinganiselayo ukucindezela ukuguquguquka kwe-amplitude yomthwali. Ngemuva kwe-attenuation efanele, kufakwa isiginali etholakele kwenye indlela yenkampani yenethiwekhi yokukhipha i-amplitude-Modulating Signal. Lesi sifunda sibonakaliswa ukuqina okuthe xaxa, kepha ukuhamba kwesigaba akunakuba kube nkulu kakhulu (ngokuvamile ngaphansi kuka-15 °) noma ukuhlanekekekekekekekekekelwa nge-15 °) noma ukuphaphamba okukhulu. Isizinda sesigaba sesigaba esilula sivame ukusetshenziswa ku-FM Broadcast Transmitters.
