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7 « There you have a brief rundown of what has tentatively been lined up for the 1955 NAEB TV Engineering Workshop. Educational television stations will soon have three microwave installations in operation linking together multiple studio operations. The first of these is at WUNC-TV at the University of North Carolina and has been in operation since last December. The other two microwave systems are those of the Alabama Educational TV Commission now in partial operation and the one at the Detroit Educational Televi¬ sion Foundation. At WUNC-TV, all switching between studios is done at the transmitter, located some eight miles from Chapel Hill, N. C. This is also the location of the film chain and kinescope recorder. Studios are located at Chapel Hill, Raleigh and Greensboro. The Greensboro circuit has a repeater station while the circuits to Chapel Hill and Raleigh are single hop transmissions. With this type of operation, picture roll over becomes a problem due to the switch¬ ing of composite signals at the transmitter. Mr. Charles A. Idol, Engineer in Charge of the Raleigh studio, is making a study of the problem as a masters thesis. We hope soon to be able to report on his solution to this problem. In Alabama, to the best of our knowledge, only the circuit between Birmingham and Mb. Cheaha (Munford) is in service. This is a two hop circuit as are the circuits between Tuscaloosa and Birmingham and between Mt. Cheaha and the Auburn studio. An additional circuit with a relay point will be required between Auburn and An¬ dalusia when the transmitter at Andalusia goes on the air. In Detroit, the transmitter is located adjacent to the Detroit Public Schools studio and the system film chain. This location is corrected with studios at Wayne Uni¬ versity, and the University of Detroit by microwave links. The June 1955 issue of Tele-Tech has as a supplement a complete electromagnetic spectrum chart which shows all 1955 FCC Frequency Allocations. a#*##*###*# General Electric Co, publishes a handy capacitor and color code chart which should be useful over your work bench. Write Mrs. G. Bamerick, Advertising Distribution & Supplies, Broadcast Equipment, GE, Electronics Park, Syracuse, N. Y. if you wish a copy. ####**#*•**# Berten Holmberg, Chief Engineer of KUOM has forwarded us copies of an 'article on motion picture film winds, a paper classifying film stocks titled "A” WIND OR n B n WIND — Which is it? We*11 include it in the next issue of the Engineering News¬ letter, but if you wish a copy now, write to us at NAEB Headquarters. r