. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. WIRE COMMUNICATION AIDS TO AIR TRANSPORTATION 471 route located approximately every 50 miles afford convenient points from which branch circuits are extended to the intermediate airway stations. The several branch circuits are of the grounded open-wire. PITTSBURGH. ALTOONA. HARRISBURG - KEY- z:^=^= Metallic Telegraph Circuit in. Cable. '>/N<vw\A. Carrier Current O'rcuit in Cable. Grounded Circuit on Open Wire. â â¢â â¢â¢â¢â¢â Airway. O Ccmm. Intermediate
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. WIRE COMMUNICATION AIDS TO AIR TRANSPORTATION 471 route located approximately every 50 miles afford convenient points from which branch circuits are extended to the intermediate airway stations. The several branch circuits are of the grounded open-wire. PITTSBURGH. ALTOONA. HARRISBURG - KEY- z:^=^= Metallic Telegraph Circuit in. Cable. '>/N<vw\A. Carrier Current O'rcuit in Cable. Grounded Circuit on Open Wire. â â¢â â¢â¢â¢â¢â Airway. O Ccmm. Intermediate Field. @ Commercial or Municipal Airport â ⺠Telegraph Repeater Fig. 4âLayout of typical teletypewriter circuit along airway. type and total 331 miles. A total circuit mileage, therefore, of 846 miles is required in this case for connecting all stations along an air route a little over 400 miles long. The Newark-Pittsburgh section of the main circuit is operated on metallic telegraph cable facilities, a type particularly adapted to use where stations to be connected to the circuit are spaced at frequent intervals. Between Pittsburgh and Cleveland a channel of a voice frequency carrier telegraph system on cable facilities is used. This type of facility is generally used where stations are located 150 or more miles apart. The longer branch circuits on open wire employ polar transmission with repeaters at both the repeater station and terminal and use two wires, one for each direction of transmission. The shorter branch circuits use one wire with a grounded duplex repeater at the repeater station and a constant potential at the outlying terminal. Detail descriptions of these various telegraph systems have been given in previous papers. Cable circuits are less susceptible than open-wire circuits to inter-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of t
Size: 2456px × 1018px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
