A new system of VLF d ir ection findin g has been developed an d tested by th e National Bureau of Standards, Bo uld er, Colorado. The system. h as b een nam ed " Ephi" (E-c/» b ecau se t he bearin g of t he tra nsient signal is d etermin ed from the r elative phase (c/» of the v ertical electri cal fi eld (E) r eceived at spaced a n tennas. The a dv an tage of t hi s schem e compared to co nventional cro ssed-loop techniqu es is t hat it minimizes sit in g and pol ari zation errors. A mi ni m um of t hree ante nn a~ mu st be used to r esolve direct.ional ambigu ity, a nd the preferrred antenn a location is at t he vertices of a n eq ui lateral t ria ngle with baselin es equal to % to j,{o wavelength (at 10 kc). App ropri 'lte pha se d et ectors, delay lin es an d coin ciden ce circui ts a re u sed to obtai n a directio na l cod e in p rese t sectors. Wit hin practical in st ru m entation li mits a ny numbe r of sectors of variable w id t hs can be operated simultaneo ll sly a nd each can be rotated ill !.lzimu th. ' Contri but ion from Ole Central R adio Propagation Laboratory, :"Jationa I Bureau of Slanda rds, B oulder, Colo. 1 F. Horner, 'rhe accu racy of the location of sources of atmospherics by rad io direetion•fin ci in g, Proe. lEE , 101,383, (1954).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.