The problem of installing a V H F communications equipment in a helicopter is the fitting into the aircraft of a transmitting and receiving unit and associated parts The installation should be planned with three considerations in mind, namely, operating efficiency, crew comfort and maintenance I intend to amplify these three considerations but before doing so let us look at two examples of modern V H F equipment on display here tonight

Outwardly they are of similar pattern and in both cases consist of a rack-mounted, quickly detachable, transmitter/receiver unit, which incorporates the frequency selector switch, an aerial and various types of cable connector The Murphy MR 80, MR 100 equipment has a backplate or junction box attached to the rear of the rack into which the main unit slides All control unit, aerial, and battery cable connections terminate in the backplate

The Standard Telephones STR9X is of similar form except that the cable connectors terminate on the front of the main unit