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Radios

There are a number of radio modules in use with descriptions :

Module	Price	Stability	Complexity	Frequency	Further Information
Radiometrix NTX2	Low	Poor	Simple	434.075 or 434.650	Data/Linking to an Arduino Suitable for RTTY
Radiometrix LMT2	High	Excellent	Simple	433.900 → 434.650	Data/Linking to an Arduino Suitable for RTTY
Radiometrix TX3H	?	Poor	?	869.50Mhz	Data/Linking to an Arduino Suitable for RTTY
Radiometrix HX1	Medium	Good	Moderate	APRS 144.800/143.900/144.390	Data/Linking to an Arduino Suitable for APRS
HopeRF RFM22B	Low	Poor	Moderate	413.000 → 453.000	Data/Linking to an Arduino Suitable for RTTY

Note “Poor” stability means unless well insulated the frequency will drift noticeably.