The Superheterodyne RXB6 is a good quality 315 MHz radio receiver. It is the radio receiver 315MHz recommended by Stuntteam to realize the radio gateway RFLink. Follow this tutorial to build your RFLink gateway. The complete list of required components can be found here.
Superheterodyne RXB6 315MHz Deals
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Smart Home: Interface and Protocol
Equipment | Component | Other: Spare parts
Radio (433MHz, LoraWan, Sigfox...) | GPRS
Output | Relay: 0