Transceivers can both send and receive.
GFSK-Transceivers are FM (Frequency Modulation) transceivers for digital communication: they use GFSK (Gaussian Frequency-Shift keying) to encode bits or symbols.
GFSK is a FSK enhancement so any GFSK transceiver can also use FSK. While FSK transceivers are not fully compatible with ASK (as they cannot change the amplitude), they are still compatible with the simple OOK modulation since this only requires sending at full amplitude and not sending. GFSK transceivers are therefore compatible with most usage scenarios including communicating with simple OOK remote controls.
Overview
GFSK is an evolved FSK modulation designed to efficiently transmit data at high data rates and without causing much interference.
GFSK is used commericially for example in Bluetooth and DECT wireless phones.
Use Cases
GFSK transceiver breakout boards can use the same fundamental technology for high-speed custom-protocol data transmission.
Essentially, they provide the core transmission protocol without any other and more specific data protocols (such as Bluetooth or DECT).
This way, you can use your own libraries and/or create light-weight custom protocols to transfer large amounts of data reliably.
GFSK (and the powerful breakout boards supporting it) are perfectly suited to transmit data-intensive payloads (such as video) over distances of 300-1000m without the need of any supporting infrastructure.
When Not To Use
If you need to transmit only small amounts of data (i.e. temperature sensor data or remote control commands), you should rather fall back to simple and inexpensive FSK or ASK transceivers.
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(content created Apr 17, 2024)