V.H.F. Radio Demonstrated by Van
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TO meet the increased demand for information regarding the potentialities of V.H.F. intercommunication, the Coventry radio and television works of the General Electric Co., Ltd., have recently put into service a new MorrisCommercial demonstration and survey van. "On the spot" demonstrations to industrial organizations, municipal :..orporations and other potential users throughout the country are being given. In addition, the van is extremely ..tseful for carrying out field tests on my terrain which isito be covered by a V.H.F. network: such tests show how 3ermanent equipment can be installed o the greatest advantage.
The van carries six transmittereceivers of various types. Masts, serials and all necessary test gear are housed in the van, which operates as a fixed station, a specially equipped Standard Vanguard shooting brake operating as the mobile station.
The radio equipment is accommodated in two cabinets and a rack, all of which are mounted on rubber. The cabinets are disposed side by side across the van behind the cab so that their backs are accessible from the cab. The rack is located on the near side close to a high wall cupboard. A small table folds down against the side wall: this is used as the operating position and carries the microphone and loudspeaker control unit or desk-telephone.
A work-bench is fitted on the off side of the van and above this is a long cupboard. which runs the length of the body. Sections of the portable masts are stowed in mountings just below this cupboard. At the end of the workbench is the main control panel from which radiates all the current required for lighting and operating the equipment.
A battery charger is fitted alongside
the control panel. A whip aerial is mounted on the roof.
The van has an ambulance chassis and •is fitted with large-section tyres.
For demonstration purposes the van is parked near the fixed station position. the 55-ft. light-alloy aerial mast is set up, and a feeder cable from the aerial is connected to the equipment. Mains supplies arc used when available, but a battery-driven rotary converter is included in the equipment so that the apparatus can be used on isolated sites.