National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Guidelines for Trolley Carrier Phone Systems.

PB273479

Publication Date	1977
Personal Author	Spencer, R. H.; O'Brien, P.; Jeffreys, D.
Page Count	172
Abstract	Guidelines for trolley carrier phone systems have been prepared and documented to enable operating personnel to improve and upgrade their carrier phone systems. These guidelines cover installation of equipment, conversion of a rail haulage trolley wire and feeder system into a functional carrier frequency transmission line, performance checkout of the trolley carrier phone system, and the development of practical portable test instrumentation. This report summarized the program that led to the development of the guidelines and recommends a program to test and improve their effectiveness. The guidelines were developed using data compiled from four activities: (1) visiting and interviewing persons knowledgeable in and familiar with trolley carrier phone systems; (2) examining the Code of Federal Regulations, Title 30, Mineral Resources, to determine the federal regulations that apply to carrier phones; (3) examining equipment in the laboratory loaned by carrier phone manufactures; and (4) performing in-mine measurements and tests. A full set of the guidelines is appended to the report.
Keywords	Wired wireless Mine haulage Locomotives Coal mines Instructions Mine communications Underground communications
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 45C - Common Carrier & Satellite
Corporate Authors	Little (arthur D.), Inc., Cambridge, Mass.; BUREAU OF Mines, Washington, D.C.
Document Type	Technical Report
Title Note	Open file rept. (Final).
NTIS Issue Number	197803
Contract Number	J0166010

Guidelines for Trolley Carrier Phone Systems.

Guidelines for Trolley Carrier Phone Systems.
PB273479

Publication Date	1977
Personal Author	Spencer, R. H.; O'Brien, P.; Jeffreys, D.
Page Count	172
Abstract	Guidelines for trolley carrier phone systems have been prepared and documented to enable operating personnel to improve and upgrade their carrier phone systems. These guidelines cover installation of equipment, conversion of a rail haulage trolley wire and feeder system into a functional carrier frequency transmission line, performance checkout of the trolley carrier phone system, and the development of practical portable test instrumentation. This report summarized the program that led to the development of the guidelines and recommends a program to test and improve their effectiveness. The guidelines were developed using data compiled from four activities: (1) visiting and interviewing persons knowledgeable in and familiar with trolley carrier phone systems; (2) examining the Code of Federal Regulations, Title 30, Mineral Resources, to determine the federal regulations that apply to carrier phones; (3) examining equipment in the laboratory loaned by carrier phone manufactures; and (4) performing in-mine measurements and tests. A full set of the guidelines is appended to the report.
Keywords	Wired wireless Mine haulage Locomotives Coal mines Instructions Mine communications Underground communications
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 45C - Common Carrier & Satellite
Corporate Authors	Little (arthur D.), Inc., Cambridge, Mass.; BUREAU OF Mines, Washington, D.C.
Document Type	Technical Report
Title Note	Open file rept. (Final).
NTIS Issue Number	197803
Contract Number	J0166010