Belgium–France border provinces of West Flanders (Flemish Region) and Hainaut, Namur and Luxembourg (Walloon Region). The French side of the border is shared by, from north to south, the departments of Nord and Aisne (region of Hauts-de-France) and Ardennes, Meuse and Meurthe-et-Moselle (region of Grand Est). Belgium–France border The <dfn>Belgium–France border</dfn> separates France and Belgium countries and is 620 km long. Part of it is defined by the Leie river. The western end is at the North Sea ( near De Panne and Bray-Dunes). The eastern end is at the Belgium–France–Luxembourg tripoint (at near Athus and Mont-Saint-Martin). The straight distance between these
Phase-locked loop ranges between initial and final phase deviation is larger than formula_13, we say that cycle slipping takes place. Here, sometimes, the limit of the difference or the maximum of the difference is considered Definition of lock-in range. If the loop is in a locked state, then after an abrupt change of formula_15 free within a lock-in range formula_16, the PLL acquires lock without cycle slipping. Here formula_17 is called lock-in frequency. Phase-locked loop ranges The terms hold-in range, pull-in range (acquisition range), and lock-in range are widely used by engineers for the concepts of frequency deviation ranges within which phase-locked loop-based