Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

SUMMARIES — TRANSMISSION 205AUDIO FREQUENCY RESPONSE AND DISTORTIONMEASURING TECHNIQUES FOR F-MTRANSMITTING SYSTEMS*!ByR. J. NewmanEngineering Products Department, RCA Victor Division,Camden, N. J.SummaryNecessary procedures for making the response and distortion measurementsrequired for "proof of performance" of FM installations is dealt within this paper. The equipment required is indicated, and the subject ofpre-emphasis is discussed. Topics covered include: arrangement of equipment,calibration of the audio oscillator, frequency response measurements,use of distortion and noise meter for frequency response, measurements,harmonic distortion measurements, and FM and AM noise level measurements.(6 pages; 5 figures; 1 table)* Decimal Classification : R630.1.f Broadcast News, June, 1945.F-M ANTENNA COUPLER*!ByJohn P. TaylorEngineering Products Department, RCA Victor Division,Camden, N. J.SummaryAn FM antenna at the top of a base-insulated tower used as an AMradiator is fed through a concentric line without short-circuiting the tower.The coupling unit which accomplishes this is described in detail. The couplingproblem is dealt with both in theory and with regard to construction.The tuning procedure is discussed in a thorough manner.(S pages; 8 figures)* Decimal Classification: R320.51.f Electronics, August, 1945.