Mobile network of the Singapore Component of the Royal Malaysia Police

The Singapore Component of the Royal Malaysia Police recently undertook a modernization program to replace its existing VHF-AM communication system with a new one offering a greater degree of reliability and coverage along with extreme flexibility and simplicity of operation. In consultation with the communications personnel of the Singapore Component of the Royal Malaysia Police, the Radio Corporation of America developed the system to meet the following requirements: 1. The entire mobile communication system would be for three separate networks with 92 operational mobile stations in the 460-470 mc region. 2. Each network would include two fully equipped radio controlled base stations, the second station operating as a "hot" standby station at a second location to minimize security risk. 3.Switchover to standby for one net was to be accomplished without affecting the other two nets. Similarly, switchover to standby of any component in the control station (receiver, transmitter or line amplifier) was to be accomplished without affecting any of the other components within that net. 4.Each network would De under the control of a separate console, with provisions in each console for assuming operational control of either or both the other two nets, the transfer of control to be accomplished in such a way as not to drop a net. 5. All consoles would be of the passive type, consisting only of switches, keys, lamps and meters necessary for the intended operational control functions. All line amplifiers and relays which might, in the course of time, give rise to a service problem, were to be located elsewhere to insure full use of the system, even while service work is in progress. 6. All equipment was to be mounted in dust and insect proof cabinets and capable of providing normal service under ambient temperatures between 75° F and 120° F and relative humidity of at least 90%. 7. To fully utilize space on antenna tower shared by several other Singapore communication services, the outputs of all three network transmitters would be combined in a single antenna with minimum interaction between transmitters despite frequency separations as small as 250 kc.