Radio arrangement having two radios sharing circuitry
Cellular portable telephone battery pack and programmer interface
Combined trunked/cellular communication unit
Dual mode cellular telephone apparatus
Mixed-mode transceiver system
Dual mode portable cellular telephone having switch control of the rf signal path to effectuate power savings
Hands-free module Patent #: 5487182
ApplicationNo. 440215 filed on 05/12/1995
US Classes:455/74, Convertible (e.g., to diverse art device)455/552.1Operable on more than one system
ExaminersPrimary: Eisenzopf, Reinhard J.
Assistant: Nguyen, Lee
Attorney, Agent or Firm
Foreign Patent References
International ClassH04B 001/40
Foreign Application Priority Data1994-05-13 JP
AbstractA radio communication device which is capable of effecting communications in different communication systems and is highly advantageous economically has a main communication unit capable of effecting communications in a first digital cellular communication system (GSM), and an additional unit to be attached to said main communication unit for effecting communications in a second digital cellular communication system (PCN) which differs from said first digital cellular communication system. The main communication unit includes variable-bandwidth filters compatible with both GSM and PCN. The additional unit comprises a power amplifier, and the main communication unit has a power amplifier. Switching can be made between these power amplifiers to make the radio transmission device compatible with both GSM and PCN. The radio communication device has many components shared by GSM and PCN and hence is highly economical.