Personal radio station
BACKGROUND OF THE INVENTION 
     The present invention relates to a device in a portable personal radio station which may be remote controlled from an external auxiliary set which for example may be mounted within a vehicle. 
     A personal radio station known in the art is carried for example by a policeman in a satchel or shoulder bag. The station is controlled from a remote control unit which for example may be attached to the coat lapel and which comprises a housing of such a small size that it is held in the hand. The housing may for example comprise a microphone, a loudspeaker and a transmit/receive switch. 
     When the policeman is going by car the personal radio station is connected to an auxiliary set mounted in the car. Said auxiliary set may for example comprise a car radio aerial, power amplifying units, a transmit/receive switch mounted in the steering wheel, a loudspeaker and a microphone both being stationary mounted within the car, channel selection knobs which together with other controls, as for example volume control and devices for tone selective calls etc., are mounted on a panel. 
     The personal radio station is connected to the auxiliary set in the following manner: the policeman releases the personal radio station from his shoulder bag and the station is placed in a cartridge provided with a control panel from which it is now possible to operate the personal radio station. 
     However, this way to connect the station to the auxiliary set is very inconvenient because the station must first be released from the shoulder bag and thereafter the station, which may be comparatively heavy, must be carefully placed in the cartridge in a predetermined position. 
     SUMMARY OF THE INVENTION 
     There is an object of the present invention to eliminate this drawback and to provide a convenient, quick and reliable method for connecting the portable personal radio station to an external auxiliary set, which for example may be mounted within a car, from which the personal radio station then is remote controlled. 
     In accordance with one aspect of the invention there is provided a remote control unit for controlling a number of predetermined functions (as, for example, microphone function, loudspeaker function and transmit/receive switching) of a portable personal radio station comprising transmitter and receiver units, said remote control unit being mounted in a housing provided with a projecting aerial, said housing being intended to be carried in the hand or attached to a coat lapel. In accordance with this aspect of the invention the remote control unit comprises contact means mounted within said housing, said contact means permitting control of a desired number of functions (as, for example, the microphone function, loudspeaker function, transmit/receive switching, channel selection, battery charging, tone selective calls etc.) of the personal radio station from an external auxiliary set, said contact means together with said aerial forming a plug-in unit for connecting the personal radio station to said external auxiliary set. 
     In accordance with another aspect of the invention there is provided an auxiliary set, for example mounted within a car, intended to be used together with the remote control unit. The auxiliary set is provided with a number of function and/or control units (for example, microphone, loudspeaker, transmit/receive switch, channel selector, volume control etc.) for those functions of the personal radio station which are desired to be remote controlled from said auxiliary set. The auxiliary set is characterized by socket means mounted in a panel thereof and being intended for receiving said plug-in unit, said socket means comprising a contact member for receiving said contact means and an aperture for said aereal. 
     By inserting the plug-in unit into the panel it is thus possible for the policeman to operate the personal radio station from the auxiliary set without the need to release the personal radio station from the shoulder bag. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     An embodiment of the invention will be described in connection with the attached drawings in which: 
     FIG. 1 shows a plug-in unit and socket means in accordance with the present invention, and 
     FIG. 2 is a simplified circuit diagram of those functions which may be remote controlled from said auxiliary set after insertion of the plug-in unit into the socket. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A personal radio station, not shown, is for example carried in a shoulder bag at the waist and is controlled by a remote control unit 1. The number of functions which are remote controlled may theoretically be any desired number. The remote control unit comprises a housing 2 of such a small size that it generally may be held in the hand. The back wall, not shown, of the housing may be provided with fastening strips for attaching the remote control unit to the clothes, for example a coat lapel. A microphone and a loudspeaker 26 is mounted within the housing shown in FIG. 1. Further there is a transmit/receive switch 3 provided on one of the side walls of the housing. A cable 4 connects the remote control unit with a personal radio station having a transmitter and a receiver. The personal radio station may operate in the UHF or VHF frequency region. An aerial 5 of the helix type is provided on the upper wall of the housing. The length of the aerial is about 3.15-3.94 inches and the aerial comprises a copper helix coated with rubber or the like. Contact means 6 are built-in in the upper wall of the housing. Said contact means comprises a number of contact members 7 (in the drawing there is shown 8 such contact members) permitting remote control of the radio station from an external auxiliary set 8. Any desired number of functions may be remote controlled. Contact means 6 may for example comprise a card contact having female contact members. The aerial 5 together with contact means 6 form a plug-in unit for the personal radio station. Said plug-in unit is intended for insertion into an auxiliary set 8 having a socket 10 in a panel 9, said socket being adapted to receive the plug-in unit. The auxiliary set may for example be mounted within a vehicle. Said socket 10 comprises contact members 11 for receiving contact means 6 and an aperture 12 for receiving aerial 5 is provided in said panel. Contact members 11 may for example comprise a card contact provided with male type contacts for receiving said female contacts 7. Around the inside of said aperture there is provided a helix 13 (compare FIG. 2) which via a power amplifier 14 shown in FIG. 2 (and belonging to the auxiliary set) by induction connects aerial 5 to an external aerial, for example a car radio aerial 15. The auxiliary unit shown in FIG. 1 is provided with controls for volume etc. and controls, not shown, for channel selection. 
     When the remote control unit 1 is attached to the coat lapel it serves as loudspeaker, microphone and transmit/receive switch. However, when the same remote control unit 1 serves as a plug-in unit, i.e. when it is inserted in socket 10, said loudspeaker, microphone and transmit/receive switch functions are taken over by corresponding controls of the auxiliary set. Upon insertion of the remote control unit 1, functions other than those indicated above also are taken over by the auxiliary set. For this purpose, unit 1 can contain circuitry identical to that associated with a set of external contacts in one of the portable radio stations of the PU-Series manufactured and sold by the Swedish firm AGA Aktiebolag, having offices in Stockholm and other cities. 
     As appears from the simplified circuit diagram shown in FIG. 2 the auxiliary set may also provide such facilities as, for example, charging the accumulator of the personal radio station from the accumulator of the car over input 20, tone selective calling over input 22 etc. Further, the stationary auxiliary set is provided with an amplifier 14, aerial 15, a stationary loudspeaker 16 supplied from a power amplifier 17, a microphone 18 and a transmit/receiver switch 19 mounted in the steering wheel. The number of functions of the personal radio station to be remote controlled from the auxiliary set is variable and need not be chosen in accordance with any particular rule. 
     The above described embodiment of the invention may in many ways be varied and modified within the scope of the present invention.