Modulator na-eme ihe bụ sekit nke akara ngosi na-achịkwa akụkụ nke ebili mmiri na-ebu ibu. E nwere ụdị abụọ nke usoro mgbanwe nke sine wave: modulation na-aga n'ihu na nke na-apụtaghị ìhè. Ụkpụrụ nke modulation na-aga n'ihu bụ iji mgbama modulating ka ọ gbanwee parampat nke loop resonant ozugbo, nke mere na akara ngosi nke ụgbọelu ahụ site na resonant loop iji mepụta mgbanwe na-eme ka usoro mgbanwe na-etolite; Usoro modulation nke na-apụtaghị ìhè na-ebu ụzọ gbanwee njupụta nke ebili mmiri a na-emegharị emegharị, wee gbanwee mgbanwe njupụta n'ime mgbanwe nke usoro, ka ọ wee nweta nhazi usoro. Usoro a bụ Armstrong mere na 1933, nke a na-akpọ Armstrong modulation method
Igwe ngbanwe ngwa ngwa na-achịkwa nke eletrọnịkị bụ netwọọdụ ọdụ ụgbọ mmiri abụọ ejiri na-enye ọdịiche nke oge n'etiti nsonaazụ na ntinye ntinye nke nwere ike ịchịkwa akara njikwa (n'ozuzu voltaji nke DC). Ọnụ ego ngbanwe nke usoro nwere ike ịdịgasị iche na-aga n'ihu site na iji akara njikwa ma ọ bụ n'ụkpụrụ a kara aka. A na-akpọ ha ndị na-agbanwe akụkụ analọgụ na ndị na-agbanwe oge dijitalụ n'otu n'otu. The phase modulator bụ ọnụọgụ ọnụọgụ abụọ na-agbanwe igodo igodo n'ime usoro nkwurịta okwu ngwa ndakwa nri, nke na-eji ebili mmiri na-aga n'ihu na-emegharị akara ngosi. Enwere ike ikewa mgbanwe mgbanwe nke usoro nke sine ka ọ bụrụ modulation nke oge na-apụtaghị ìhè na usoro mgbanwe ozugbo. Site n'iji njikọ ahụ na akụkụ njupụta nke sine wave bụ ihe dị mkpa nke ugboro ole ozugbo, enwere ike gbanwee ifegharị ugboro ugboro ka ọ bụrụ ifegharị modulated (ma ọ bụ ọzọ). Ihe sekit modulator a na-ejikarị eme ihe bụ varactor diode phase modulator. Sekit modulation nke na-apụtaghị ìhè dị mgbagwoju anya karịa sekit modulation nke a na-ahụ anya. Ụkpụrụ ya bụ na otu ụzọ nke mgbaàmà ụgbọelu na-atụgharị site na 90° phase shifter wee banye n'ụdị amplitude-modulator kwesịrị ekwesị iji kwụsị njupụta modulation nke ụgbọelu ahụ. Mgbe attenuation kwesịrị ekwesị, a na-agbakwunye mgbaàmà enwetara na ụzọ ọzọ nke onye na-ebu ya ka ọ pụta ìhè njupụta-modulating. Ihe e ji mara sekit a site na nkwụsi ike ugboro ugboro, mana ngbanwe nke oge enweghị ike ibu oke (n'ozuzu ihe na-erughị 15 Celsius) ma ọ bụ nnukwu mgbagha. A na-ejikarị modulator usoro dị mfe na mgbasa ozi mgbasa ozi FM.
