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TV TECHNICAL TIPS —Cecil S. Bidlack On May 28th, the Federal Communciations Com¬ mission extended the date for compliance with para¬ graphs 3.690 and 3.691 of Part 3 of its rules govern¬ ing Radio Broadcast Services. This extended date is June 1, 1959. These are the paragraphs which re¬ quire television transmitters to have frequency and modulation monitors. In its release, the Commission stated that with the continued development of more stable frequency control circuits in all types of broad¬ cast transmitters (AM, FM, and TV) it is consider¬ ing a review of its requirements on the continued use of such apparatus. Should it appear that the rules relating to such monitors need to be amended, an ap¬ propriate rulemaking proceeding will be initiated. On June 9th the Commission also adopted an amendment to its rules for non-commercial educa¬ tional FM stations regarding its CONELRAD rules concerning these stations. Section 3.573 (b) has now been amended to refer educational stations to the ap¬ propriate section 3.1003 (a) of CONELRAD rules rather than to the commercial FM remote control rules as formerly. ***** Our picture for this month illustrates a “boor- mobile'’ developed by John Boor of KCTS in Seattle, Wash., for use in schools in their area. The antenna is readily demountable and is at a height of approxi¬ mately 6V2 feet so that persons of ordinary height do not bump their heads on it. The five-element Yagi antenna for channel 9 is of commercial make as well as the cart, so that total cost of cart and antenna is around $25.00. In addition to the picture Boor has supplied us with a list of what he considers highly desirable fea¬ tures for a TV receiver to be used in a classroom: 1) Flat tinted glass, tilted forward over the pic¬ ture tube. 2) Four-inch beveled light shield around the pic¬ ture tube. 3) Front speaker, eight-inch minimum. 4) Long heavy AC cord. 5) Cart with large rollers. 6) Yagi type demountable antenna on 6y 2 -foot mast. 7) Simple operation from front. 8) Twenty-one-inch screen. 9) Controls on back for all adjustments—height, width, H and V line centering; H and V hold, etc. 10) High definition video circuits—five hundred lines. 11) Transformer power supply with paralleled filaments. 12) RF—video switch for air or closed circuit use. 13) Separated audio input. 14) Loop AC from set to set. 15) Loop audio from set to set. 16) Loop video from set to set. 17) Frequency corrected audio—curtailed below 200 N. 18) Five-watt minimum audio output. ***** We’d like to call your attention to the April 1958 RCA Broadcast News as it contains a number of items of interest for both radio and television engineers. This issue contains a detailed description of how the RCA Videotape. Recorder operates, as well as articles on automation in television programming, precision offset TV carrier operation, design of a combination control room/announce booth in addition to the usual descriptions of radio and television equipment installations. Technical details of a new 500 - 1000 watt am transmitter, a 2 kw VHF television trans¬ mitter, a universal coaxial transmission line, and a new ultra-directional television microphone are also included. —N A E B— 10 NEWSLETTER