The new Phonak Roger RF digital earpiece has a shape that matches the ear canal better than its previous analog earpiece on the VHF band.
The signal can come either from a transmitting base or from a TX19 portable standalone transmitter in the form of a small 2.9" touchscreen smartphone with three built-in microphones.
RF is transmitted over the 2.4 GHz band by frequency hopping technology known as spread spectrum which is a method of transmitting signals by radio waves "which alternately uses several channels (subcarriers) distributed in a band frequency in a known pseudo-random sequence of the transmitter and receiver" (Wikipedia). With an transmitionpower of 100 mW, the maximum EIRP allowed in France, this allows Phonak to announce a range of 15 to 40 meters, depending on environment, in practice, much less as soon as there is physical separation (wall, window).
With a bandwidth of 100 Hz to 7200 kHz and a signal-to-noise ratio of 55 dB for a maximum acoustic power of 100 dB, the sound quality of the Phonak Roger earpiece is significantly higher than that of the VHF analog earpieces of the brand.
Not only is it possible to connect as many Phonak Roger DME earpices as you need to a single transmitter, but it is also possible to use several Roger TX19 touchscreen transmitters together (up to 35) to create a network of microphones to pick up and transmit different voice sources. But only one audio signal will be transmitted at a time.
Like Phonak analog earpiece, this is powered by a mercury-free Zinc-Air type PR 70 (AE10, P10) battery. The autonomy announced is around 12 hours.
After each use, always clean the tip of the earpiece with the supplied product and cloth, and change as soon as necessary the tip protecting wax for optimized hearing.