Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

SUMMARIES — TRANSMISSION 203DRIFT ANALYSIS OF THE CROSBY FREQUENCY-MODULATED TRANSMITTER CIRCUIT*!ByE. S. WlNLUNDRCA Manufacturing Co., Inc., Camden, N. J.SummaryComponent drift, sensitivity, and band-width expressions are combinedin an over-all expression for frequency stability of the Crosby circuit.Using experimentally obtained constants in this expression, an equationis derived for drift in terms of frequency and frequency multiplication opento choice by the designer, and the results are shown as design curves. Theequation is checked against actual conditions existing in a Crosby exciterunit.(9 pages; 7 figures; 2 tables)* Decimal Classification : R148.2 X R630.f Proc. I.R.E., July, 1941.ANTENNAS FOR F-M STATIONS*!ByJohn P.TaylorEngineering Products Department, RCA Victor Division,Camden, N. J.SummaryThe importance of proper antenna choice is emphasized, and the significanceof antenna gain is discussed. The paper covers: advantages ofmulti-layer antennas, limitations of multi-layer antennas, interrelation ofheight, gain and power, how antenna gain is obtained, meaning of field gainand power gain, practical types of FM antennas, original Brown turnstile,improved Brown turnstile, modifications of the turnstile, circular or "ring"antennas, and square-loop antennas. The summary lists a number of checkoffitems toguide station engineers in planning an FM station.(8 pages; 15 figures)* Decimal Classification : R320 X R630.f Broadcast News, August, 1944.