Broadcasters’ news bulletin (Jan-June 1932)

Record Details:

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May 28, 1932 SyUCHROinZATION TESTS HALTED The synchronization ezjjeriments which were conducted hy Station WTIC, Hartford Connecticut, eaid Station TffiAL, Baltimore, Maryland, since March, 1931, will he dis¬ continued June 15th, -onder a decision of the Commission denying further authority for such operation v/ith Commissioner Lafount dissenting and Commissioner Brov/n not participating in the action. The Hartford and Baltimore stations arc regularly licensed to share time on the cleared channel of 1060 kc with WTIC using 50 kilowatts and YfBAL authorized to operate with power of 10 KFJ. In December, 1930, the Commission authorized the in¬ stallation of special equipment hy both stations V7ith the purpose of permitting synchronization experiments between Station WTIC and Station ^TEAF, Hew York City, on the latter station frequency of 660 kc, when Station 'JIBJJj v;as authorized to operate on 1060 kc; and Station WBAL v/as to operate with Station WJZ on 760 kc while WTIC was using the regularly licensed assignment of 1060 kc. The Commission authorized the operation on an experimental basis. During January of this year, the full Commission hoard the applications of Stations iJBAL and WTIC seeking authority to continue these tests. The Commission in its statement of facts accompanying the decision Sc?Ad that the greatest difficulty v/ith synchronization of stations is that of phase syn¬ chronization at points of reception. "The main problem of sjmehronizat ion, " the Commission continued, "may be considered as one of accomplishing at all peunts synchronous reception of the wa,vos emitted from the stations under question. In order to avoid distortion the waves from the synchronized stations must be received in the same phase relationship, both carriers and sidebands. Assuming a perfect synchronization of transmission by WTIC-liTEAF and WBAL-VifJZ, there is and can be no guarantee of perfect synchronization of reception. There are three principal ways in v/hich changes will take place that result in phase shift or displacement between the received waves. "These are as follows; "1* Phase shifts in apparatus during transmission that result in time phase differences in the transmitted v:aves: "2. Tlie length of the paths of propogation between transmitters and given points of reception being different result in phase displacement between the received waves; and "3, Phase shifts in the propagated waves, both of the ground wave and sley wa„ve, but generally encountered due to the refraction of the slcy wave at the Kennelly-Hcaviside layer. "Tlie principal difficulty encountered in the WTIC-WEAE experiment has been definitely established to be duo to the overla.pping of the grou-id waves, '""■.e trans mitters of WTIC and WEAF are separated by approximately 83 miles. During the oaily course of these experiments end v/hilo synchronized v;ith WEAF, Station WTIC operated with day and night power varying between 1^ KW to 50 EW. Later the power of WTIC was reduced to 5 KW day and 1-| KW to 5 KIT night. Tlie pov/er of WEAE has been mainta,ined constantly at 50 K\7, Tliis has resulted in a substantail over