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Nejv Microwave Relay to and from RCAs jL\. microwave control system capable of handling all signals between RCA's Central Radio Office in New York and the company's overseas transmitting and re- ceiving stations on Long Island is expected to go into operation within the next few months. This radio control system, operating on ultra-high frequencies, eventually will replace almost all wire lines presently linking the same points under lease from the New York Telephone Company. The map gives an indication of the path of the new system. Signals from the Central Office will go out from transmitters on the roof of the City Bank Farmers Trust Building in downtown Manhattan. At a point some distance out on Long Island, transmitting and receiving equipment, housed atop a tall antenna tower, will relay the signals to and from Riverhead and Rocky Point. This relay station is situated approximately half way between the two extremes of the system. Microwave relays are not new to RCA operations. As early as 1934, the company operated VHF channels between New York City and Philadelphia. To some extent this present system is unique. It operates in such a way that all signals are transmitted simultaneously over duplicate facilities to assure unin- terrupted service. By sub-dividing a radio channel the same signal can be transmitted on different frequencies over duplicate transmitters and receivers working inde- pendently of each other. Thus if the equipment on one to Carry Radiograms Long Island Stations channel should fail the signal will still get through. This duplication of facilities is important. Continu- ous public service twenty-four hours of every day and experience has shown that no single piece of equipment can withstand this constant strain. In designing this system RCA engineers placed re- liable public service above everything else. All equip- ment is designed to operate automatically and to signal at either end of the system in the event of emergencies such as power failure, high temperatures due to fire, etc. The automatic signalling will also warn of equipment failure, including even a black-out of the flashing beacon on top of the tower. The microwave equipment used in this system is the RCA Victor Type CW-20 consisting of 12 three-watt transmitters and 12 receivers. It operates on unusually short antenna elements. Compared to the average TV antenna, which is approximately 24-inches long, this system uses a three-inch antenna element backed up by parabolic reflectors measuring 4 to 10 feet in diameter. The system will operate in the 2000 megacycle band by authority of the Federal Communications Commis- sion. This part of the spectrum has been assigned for similar radio control system such as those in service along pipe line routes and along the New Jersey and Pennsylvania turnpikes. Signals operating in this fre- quency band are less subject to fading due to rain and (Continued on page 23) Left: RCA engineers Williamson and Sadler inspect one of the microwave parabolic antennas used in the Riverhead-to-New York relay system. RADIO AGE 11