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(New York), American Telephone and Telegraph Company, 1968. 8vo. Volume 47, September, No. 7, 1968 of "The Bell System Technical Journal". In the original printed blue wrappers. A bit of sunning to spine and previous owner's stamp to front wrapper, otherwise a very nice, fresh, and internally near mint, copy. Pp. 1143-1537. Illustrated throughout. First publication of Bell system's famous TD-3 issue. The TD-3 was the replacement of the highly successful TD-2 system.The TD-2 was the backbone of all transcontinental television broadcasting and long distance telephone traffic, before satellite transmission was made possible. By 1962 the TD-2 was carrying more than 80,000 miles of intercity television circuits and approximately 35,000,000 miles of telephone circuits, representing more than 90 per cent of all intercity video and 40 per cent of all long distance telephone circuits' mileage. It had, however, several shortcomings: It had maintenance problems, required a multi voltage power source and the noise performance were considered only marginally satisfactory. The TD-3 was to improve these shortcomings and prepare the network for increased capacity. 1. Hathaway, S.D." Hensel, W.G. Jordan, D.R. Prime, R.C. TD-3 Microwave Radio Relay System. Pp. 1143-1188.2. Jensen, R.M. Rowe, R.E. Sherman, R.E. Microwave Transmitter and Receiver. Pp. 1189-1225.3. Fenderson, G.L. Jansen, J.J. Lee, S.H. Active IF Units for the Tranmitter and Receiver. Pp. 1227-1256.4. Abele, T.A. Alberts, A.J. Ren, C.L. Tuchen, G.A. Schottky Barrier Receiver Modulator. Pp. 1257-1287 .5. Hamori, Andras Penney, Paul L. Transmitter Modulator and Receiver Shift Modulator. Pp. 1289-1299.6. Abele, T.A. Leonard, D.J.Microwave Generator. Pp. 1301-1322.7. Elder, H.E. Active Solid-State Devices. Pp. 1323-1377.8. Bradford, C.E. The Traveling-Wave Tube Amplifier for the Microwave Transmitter. Pp. 1379-1395.9. Drazy, E.J. MacLean, R.C. Sheehey, R.E. Networks. Pp. 1397-1422. 10. Barry, J.F. Gammie, J. Lentz, N.E. Salvage, R.C. 3A FM Terminal Transmitter and Receiver. Pp. 1423-1458.11. Cooney, R.T. Klisch, F.M. Susen, C.P. Test Equipment. Pp. 1459-1485.12. Jewett, W.E. Mottle, S. Power System. Pp. 1487-1509.13. Skrabal, R.J. Word, J.A. Microwave Radio Equipment and Building Considerations. Pp. 1511-1530. Seller Inventory # 43348
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