Convertible half-to-full duplex radio operation selected by battery

摘要

A radio or speaker-microphone unit (10) includes a radio housing (11) and a first (17'') or second (17') battery housing. A speaker (33) is disposed in the radio housing (11) and two microphones (34'' and 34') are disposed respectively, in the radio housing (11) and in the second battery housing (17'). The battery housings (17' and 17'') are selectively attachable with the radio housing (11) to provide a selection between first and second relative positions, with one of the positions providing a handset configuration and the other providing a speaker-microphone configuration. A switch (37) senses which of the battery housings (17', 17'') is attached and disables (36) the microphone (34'') in the radio housing (11) if the second battery housing (17') is attached.