Accession Number : AD0625114

Title :   EVALUATION OF PROPOSED MODIFICATIONS TO THE AN/UPN-15 SERIES LORAN C RECEIVERS.

Descriptive Note : Interim rept.,

Corporate Author : ELECTRONICS MAINTENANCE ENGINEERING CENTER NORFOLK VA

Personal Author(s) : Fedders, Gordon T.

Report Date : 07 JUN 1965

Pagination or Media Count : 71

Abstract : An evaluation of AN/UPN-12( ) and AN/UPN-15( ) field changes produced by EMEC was conducted. The basic AN/UPN-12 is a LORAN A receiver which is modified by installation of Field Change 1-AN/UPN-12( ) to provide LORAN C capability. Nomenclature is changed to AN/UPN-15( ) after modification. The modified equipment was installed in a naval aircraft and flown to Nassau, Bahamas. Performance data were collected enroute, on the ground at Nassau, and at the Naval Air Test Center, Patuxent River, Maryland. X and Y delay readings were recorded during both day and night periods as well as the transition periods at sunrise and sunset. The data were tabulated on graphical form for analysis. Although three of the four field changes produced no outward effect, they did contribute to overall equipment stability and reliability. The fourth modification provided a less ambiguous video display and produced much more consistent results when two ground waves were matched. Sky-wave match was more troublesome because of envelope distortion when ground and sky waves combine. Additional errors resulted when the two signals traveled via substantially different distances (the X signal 200 miles and the Y signal 1200 miles) to the receiver.

Descriptors :   *LORAN, PERFORMANCE(ENGINEERING), MODIFICATION KITS, NAVIGATIONAL AIDS, RADIO NAVIGATION, RADIO RECEIVERS.

Subject Categories : Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE