Phonak Roger! Why does Phonak use a name, that in France reminds the 50's, to name its new 2.4 GHz digital RF earpiece system! Remember those uncountable American films of war where the word Roger (pronounced Raudjeur) is the standard Anglo-Saxon answer of the cockpits to indicate that one received, understood, heard!
The Phonak Roger TX19 Pocket Touchscreen transmitter is a small 2.9" touchscreen smartphone with three built-in microphones and is powered by a non-interchangeable internal lithium battery, with a battery life approaching ten hours and charging In lasts two hours via its micro USB port. This port is also used to update the firmware.
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).
Three microphones are distributed around the case and can be used in different combinations, the principle being to pick up the relevant speech signals according to direction and layout of the transmitter.
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.
The touch menu allows microphone settings, connection of the earpieces and their audio volume, creation of a transmitter network with various icons which indicate the state of the system. A push button on the right side is used to switch on and off, a large button at the bottom of the screen, same type as a conventional smartphone, serves as Push-to-Talk or Mute.
Last, the touchscreen transmitter allows you to use an external audio source (line level) on a mini jack and, on this connector, to output the combined signal from its internal microphones to a recorder (or to headphones). An inbound/outbound open cable is provided for this purpose. Format used is standard one (Apple), from tip to cable: left-right-mass-mic (note that the Cantar X3 uses Nokia format left-right-micro-mass).