Digital Modulation¶ transmitter ASK OOK FSK FSK GFSK OOK OOK FSK GFSK modulation Optional digital modulation ASK, OOK, FSK, 3FSK, 4FSK, GFSK, MSK, GMSK, HMSK & PSK for TGR2051/TGR2053 - TTi, TGR U01, Optional digital modulation ASK, OOK

 https://en.wikipedia.org/wiki/Frequency-shift_keying

https://en.wikipedia.org/wiki/Modulation

https://www.mouser.tw/c/semiconductors/wireless-rf-integrated-circuits/rf-transceiver/?modulation%20format=FSK%2C%20GFSK%2C%20GMSK%2C%20MSK%2C%20LoRa%2C%20OOK 

RF Transceiver   FSK, GFSK, GMSK, MSK, LoRa, OOK RF Transceiver

https://tw.element14.com/c/wireless-modules-adaptors/rf-modules/rf-transceivers-sub-2-4ghz-ism-band?rf-modulation=fsk-gfsk-gmsk-msk-ook

RF Transceivers - Sub 2.4GHz ISM Band     > FSK, GFSK, GMSK, MSK, OOK RF Transceivers - Sub 2.4GHz ISM Band  FSK, GFSK, GMSK, MSK, OOK RF Transceivers - Sub 2.4GHz ISM Band

https://www.rfwireless-world.com/Terminology/OOK-vs-FSK-vs-ASK.html

OOK vs FSK vs ASK | Difference between OOK,FSK,ASK