Analysis of Model UM Switching Equipment
Abstract
The Model UM Switching equipment is employed in Loran transmitting stations to correlate the major station equipments and to perform the functions of selection, isolation and discrimination. The equipment contains three electronic discriminators whose purpose is to isolate the timer receivers when the local pulse is being transmitted. Normally only one discriminator unit is used, but if the station is double pulsed and wave antennas are used, two discriminators are necessary; the third being used as a standby. The equipment is also equipped with controls which permits the operator to connect any timer to any transmitter, and any discriminator to any timer. The equipment was installed at the experimental Loran Station of this Laboratory, at Chesapeake Bay. Tests were conducted there under actual operating conditions to determine its suitability for Loran Shore Station use. The equipment was found to be electrically suitable for use at shore stations; but the mechanical design of the equipment should be improved to make servicing and installation easier. It was found that a large amount of noise was generated by the discriminators, tending to decrease the sensitivity of the receivers. This, however is not serious with the present geographical separation of the stations, but if the base lines are to be increased, this extra noise might become objectionable. A summary of the tests conducted is included in this report as well as the shortcomings of the mechanical design. At the conclusion of these tests, the subject equipment was started on a 3000-hour life test to determine the quality of the components.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 21, 1946
- Accession Number
- AD1196143
Entities
People
- J. W. Brogden
Organizations
- United States Naval Research Laboratory