night effect

The effect of changed polarization on a direction finder occurring at night. The effective range of a long-range beacon that has a daytime range of 200 NM may be reduced to about 70 NM by night. This reduction in range occurs because of the presence of sky wave propagation in an LF/MF (low- and medium-frequency) band. The sky wave is not present during the daytime, but at night the sky waves affect the ADF (automatic direction finder) accuracy. The change in polarization in radio waves refracted by ionospheric layers results in a signal voltage being induced in the horizontal positions of the loop antenna, causing erroneous bearing directions. The effect is most common at night.

Aviation dictionary. 2014.

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  • night effect — nakties reiškinys statusas T sritis radioelektronika atitikmenys: angl. night effect vok. Nachteffect, m rus. ночной эффект, m pranc. effet de nuit, m …   Radioelektronikos terminų žodynas

  • night effect — nakties reiškinys statusas T sritis Gynyba apibrėžtis Poveikis, sukeltas bangų atspindžio poliarizacijos, kartais galintis iškreipti orientaciją. Dažniausiai pasireiškia temstant. atitikmenys: angl. night effect pranc. effet de nuit …   NATO terminų aiškinamasis žodynas

  • night effect — An effect mainly caused by variations in the state of polarization of reflected waves, which sometimes result in errors in direction finding bearings. The effect is most frequent at nightfall …   Military dictionary

  • night effect — noun : a shifting of the apparent direction of arrival of radio waves received with a direction finder that is sometimes accompanied by other irregularities of wave behavior and is most commonly observed at night …   Useful english dictionary

  • night effect — phenomenon of the nighttime …   English contemporary dictionary

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  • Night — (n[imac]t), n. [OE. night, niht, AS. neaht, niht; akin to D. nacht, OS. & OHG. naht, G. nacht, Icel. n[=o]tt, Sw. natt, Dan. nat, Goth. nahts, Lith. naktis, Russ. noche, W. nos, Ir. nochd, L. nox, noctis, Gr. ny x, nykto s, Skr. nakta, nakti.… …   The Collaborative International Dictionary of English

  • Night after night — Night Night (n[imac]t), n. [OE. night, niht, AS. neaht, niht; akin to D. nacht, OS. & OHG. naht, G. nacht, Icel. n[=o]tt, Sw. natt, Dan. nat, Goth. nahts, Lith. naktis, Russ. noche, W. nos, Ir. nochd, L. nox, noctis, Gr. ny x, nykto s, Skr. nakta …   The Collaborative International Dictionary of English

  • Night bird — Night Night (n[imac]t), n. [OE. night, niht, AS. neaht, niht; akin to D. nacht, OS. & OHG. naht, G. nacht, Icel. n[=o]tt, Sw. natt, Dan. nat, Goth. nahts, Lith. naktis, Russ. noche, W. nos, Ir. nochd, L. nox, noctis, Gr. ny x, nykto s, Skr. nakta …   The Collaborative International Dictionary of English

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