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Mikroe ISM TX Click has an ASK and (G)FSK transmitter with a programmable SPI interface. The board features the Maxim Integrated MAX41460 UHF sub-GHz ISM/SRD transmitter. It's designed to transmit On-Off Keying (OOK), Amplitude- Shift Keying (ASK), Frequency-Shift Keying (FSK), and Gaussian (G)FSK (or 2GFSK) data. The fast response time of the integrated PLL allows for frequency-hopping, spread-spectrum protocols for increased range, and security. Its crystal-based architecture provides greater modulation depth, faster frequency settling, higher tolerance of the transmit frequency, and reduced temperature dependence.