Accession Number : AD0282165

Title :   REPEATER, TELEGRAPH TH-38 () /G.

Descriptive Note : QPR no. 2, 1 Mar-31 May 62,

Corporate Author : RADIATION INC MELBOURNE FLA

Personal Author(s) : Cauble ,R. A. ; Squires ,R. D. ; Fidler,H. E.

Report Date : 01 MAY 1962

Pagination or Media Count : 30

Abstract : This research concerns the design, development and fabrication of 20 Telegraph Repeaters TH-38 ( )/G. The repeater is designed to operate in three different modes; half duplex, full duplex and half duplex-full duplex. Using the converter, circuits of differing characteristics may be interconnected and normal traffic established. A prime requisite is to achieve a Mean Time Between Failure (MTBF) of 57,000 hours. Temperature and life test conducted on the output keyer proved the acceptability of this switching scheme. The transistor keyer was adopted as the method of keying the output line. The redesign of the power supplies resulted in a significant improvement in the MTBF rate. The regulation was improved and the output ripple reduced in addition to achieving a more reliable design. Each portion of the TH-38 was thoroughly tested over the temperature range and all operating modes checked. The unit meets or exceeds all of the requirements that were checked to date. (Author)

Descriptors :   (*TELEGRAPH REPEATERS), (*TELEGRAPH EQUIPMENT), COMMUNICATION EQUIPMENT, CIRCUITS, CIRCUITS, SWITCHING CIRCUITS, TRANSISTORS, INVERTED RECTIFIERS, PAPER CAPACITORS, RADIOFREQUENCY FILTERS, MAGNETIC AMPLIFIERS, POWER SUPPLIES, POLARIZATION, DESIGN, TESTS, RELIABILITY, LIFE EXPECTANCY

Distribution Statement : APPROVED FOR PUBLIC RELEASE