multi channel radio transmitter and receiver the unique and compact cdp-tx/rx-02e-r is a frequency selectable radio data module for the 434mhz uhf band. both cdp-tx-02e-r (transmitter) and cdp-rx-02e-r (receiver) are equi......multi channel radio transmitter and receiver the unique and compact cdp-tx/rx-02e-r is a frequency selectable radio data module for the 434mhz uhf band. both cdp-tx-02e-r (transmitter) and cdp-rx-02e-r (receiver) are equipped with a frequency synthesizer system including microprocessor. 32 rf channels are selectable using an onboard 4-bit switch. a 458 mhz version is available with 11 channels. its small size, low voltage operation, and frequency selectability make cdp-02e ideal for various applications in sites where many radio transmitters are operated. 8-pin frequency selection is available as cdp-tx/rx-02ep-r.