[W5SFA] Some broadcast history

[john Parmalee]

November 1, 1931 BROADCASTING

Ultra - High Waves Appear Favorable For Television Use Better Than Low Frequencies, Many Engineers Believe SIGNIFICANT developments of the past few months in the use of the ultra -high frequencies for television indicate quite definitely, according to authoritative opinion, that visual broadcasting ultimately will repose in the bands between 43,000 and 80,000 kc., rather than in the continental short waves. Certain fundamental facts about the ultra -high frequencies already have been ascertained by experimenters, and, while it is yet too early to say just what they will do in visual radio transmission, many engineers feel that they are better adapted for television than the lower frequencies. Lack of space in the lower bands actually forced television experi- mentation into the ultra -high waves which hitherto have been regarded as practically worthless. It seems certain, however, that visual transmission on those frequencies will be purely local, with the impulses traveling only to the horizon like transmissions of light beams. When "moving day" in the high frequencies occurs next February 3, pursuant to the provisions of General Order 119, recently pro- mulgated by the Federal Radio Commission, there will be two changes directly affecting television and designed to aid its development. The 1,550 kc. channel adbjacent to the broadcast band will ecome the television sound track for sound synchronized with visual transmission. This frequency may be tuned on most broadcast receivers, and it replaces the 1,604 kc. sound track channel. The second change is in the nature of an exchange. The present television band of 2,850 -2,950 kc. will be exchanged for the aviation block ranging from 1,600 to 1,700 kc. This was decided upon by mutual arrangement between the two groups and is expected to aid both. Only two experimenters now are assigned to the television band involved and they probably will move to the new band. These are Short Wave & Television Laboratory, Boston, and Radio Pictures, New York. There may be a double -shift, however, which would involve others of the score of licensed experimenters as well as some of the later applicants for facilities.

John ParmaleeJparmalee at aol.com281-380-3811 K5VGM WI2XLJ
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