During nighttime hours, because of the intense skywave propagation then prevailing, no large number of stations can be permitted to operate on one of these channels, if the wide area service for which these frequencies are assigned is to be rendered satisfactorily by the dominant stations which must be relied upon to render it.

During the 1960s the use of manual sign language grew greatly, but it was not until the 1980s that AAC began to emerge as an area in its own right.

During this same period, slave-holding border states had more free African-Americans and European immigrants than the lower South, which increased Southern fears that slavery was threatened with rapid extinction in this area.

During the Hellenistic and Roman periods, many of the existing buildings in the area of the Acropolis were repaired, due to damage from age, and occasionally, war.

During the later part of first millennium BC the use of brass spread across a wide geographical area from Britain and Spain in the west to Iran, and India in the east.

During Charles V's invasion of Provence in 1536, Francis I of France sent the Count of Fürstenberg's 6000 Landsknechte to ravage the area in a scorched earth policy.

During the mid-18th century, the area was inhabited by a Native American tribe known as the Potawatomi, who had taken the place of the Miami and Sauk and Fox peoples.

During the 1970 – 1978 restoration works and excavations inside the building, and under the nearby Muristan, it was found that the area was originally a quarry, from which white meleke limestone was struck.

During its history the area has also been known as Congo, Congo Free State, Belgian Congo and Zaire.

During the N64's lifetime, Nintendo made one model revision which made the serial port area smaller.

During the next 750 years, independent Muslim states were established, and the entire area of Muslim control became known as Al-Andalus.

During the decade of 1780, the Spanish regained control of the Bay Islands and took most of the British and their allies in the Black River area.

During times of heavy rainfall, much of the savannah area is covered by shallow water, making transportation by means other than a shallow-draft boat almost impossible.

During the course of the war the area of Congress Poland became occupied by the Central Powers, with Warsaw captured by the Germans on 5 August 1915.

During prehistoric times, London was most likely a rural area with scattered settlement.

During these first few years Hellas was one of three or four area teams playing mainly at a municipal level while fighting against city rivals Bentegodi to become the city's premier football outfit.

During this time the Society lost about 120 people and others fell ill until conditions were improved and the swamps around the area were drained.

During the Classical period an important public building, the Pompeion, stood inside the walls in the area between the two gates.

During the Cold War there was some nuclear weapons testing in the Christmas Island area.

During Polish rule of the area in the late 10th century, the chronicle of Thietmar of Merseburg ( 975-1018 ) mentions salsa Cholbergiensis as the see of the Diocese of Kołobrzeg, set up during the Congress of Gniezno in 1000 and placed under the Archdiocese of Gniezno.

During the subsequent Christianization of the area by Otto of Bamberg, a St. Mary's church was built.

During the Herodian dynasty rule, the area has become part of Judaea.

During the first two decades of independence, Mali received major technical and financial support from the former Soviet Union, China, and their allies, especially in the area of radio and television broadcasting.

During the centuries preceding the classical period, Mayan kingdoms sprang up in an area stretching from the Pacific coasts of southern Mexico and Guatemala to the northern Yucatán Peninsula.

During the reign of Juba II Emperor Augustus ( who created in the area of what is now northern Morocco 12 colonies with retired Roman legionaries ) had already founded three colonias, with Roman citizens, in Mauretania close to the Atlantic coast: Iulia Constantia Zilil, Iulia Valentia Banasa and Iulia Campestris Babba.

During the 1st century BC, there were pirate states along the Anatolian coast, threatening the commerce of the Roman Empire in the eastern Mediterranean.

During this term he transferred Turkmen people from their Anatolian city of Aksaray to newly conquered İstanbul to populate the city which had lost a portion of its former population prior to conquest.

During a second voyage in 1494, Columbus passed along the south coast of the island, landing at various inlets including what was to become Guantánamo Bay.

During the War of the Grand Alliance, on orders from the province of New York, Massachusetts, Kidd captured an enemy privateer, which duty he was commissioned to perform off of the New England coast.

During the period leading up to the conquest of Honduras by Pedro de Alvarado, many indigenous people along the north coast of Honduras were captured and taken as slaves to work on Spain's Caribbean plantations.

During his arrival, he founded the settlement of La Navidad on the north coast of present-day Haiti.

During the 16th century, Ashante society experienced sudden changes, including population growth because of cultivation of New World plants such as cassava and maize and an increase in the gold trade between the coast and the north.

During the 1720s, the slave-trading states of Whydah and Allada were taken, giving Dahomey direct access to the slave coast and trade with Europeans.

During the 2nd millennium BCE these evolved – possibly under an Indo-European ( most likely Baltic ) influence – into proto-Sami ( inland ) and proto (- Baltic )- Finnic ( coast ).

During the 1765 season, four pilots were engaged at 4 shillings a day each: John Beck for the coast west of " Great St. Lawrence ", Morgan Snook for Fortune Bay, John Dawson for Connaigre and Hermitage Bay, and John Peck for the " Bay of Despair.

During his reign Justinian also subdued the Tzani, a people on the east coast of the Black Sea that had never been under Roman rule before.

During the Ingrian War, a fraction of the Ladoga coast was occupied by Sweden.

During the winter months, manatees often congregate near the warm water outflows of power plants along the coast of Florida instead of migrating south as they once did, causing some conservations to worry they have become too reliant on these artificially-warmed areas.

During the mid-3rd century BC, Carthage was a large city located on the coast of modern Tunisia.

During the 17th and 18th centuries, numerous trading posts, belonging to various colonial empires, were established along the coast.

During times of Portuguese colonization, Moors were persecuted, and many forced to retreat to the central highlands and the eastern coast.

During the second millennium BCE, Syria was occupied successively by Canaanites, Phoenicians, and Arameans as part of the general disruptions associated with the Sea Peoples ; the Phoenicians settled along the coastline of these area as well as in the west ( Now Lebanon & The current Syrian coast ), in the area already known for its cedars.

During World War II a Norwegian naval unit nicknamed the " Shetland Bus " was established by the Special Operations Executive in the autumn of 1940 with a base first at Lunna and later in Scalloway to conduct operations around the coast of Norway.

During the winter of 424-423 BC, the Spartan general Brasidas attacked Amphipolis, a half-day's sail west from Thasos on the Thracian coast, instigating the Battle of Amphipolis.

During the winter or dry season, extending roughly from November to April, the monsoon winds usually blow from the northeast along the China coast and across the Gulf of Tonkin, picking up considerable moisture ; consequently the winter season in most parts of the country is dry only by comparison with the rainy or summer season.

) During the Three Kingdoms, the king of Wu sent a diplomatic mission along the coast of Asia, reaching as far as the Eastern Roman Empire.

During this century, the Middle East, the coast of North Africa and the Iberian Peninsula rapidly come under Islamic Arab domination.

During the Bronze Age the pattern of settlement at Mycenae was a fortified hill surrounded by hamlets and estates, in contrast to the dense urbanity on the coast ( cf.

During LHIIIA: 2, Ahhiya, now known as Ahhiyawa, extended its influence over Miletus, settling on the coast of Anatolia, and competed with the Hittites for influence and control in western Anatolia.

During the Battle of Dakar, which took place off the coast of Dakar on September 23 – 25, 1940, the British navy attempted to rally the colonial administration in Dakar to the Allied cause and detach it from Vichy.

During the history of Portugal between 1415 and 1578, Portugal explored the Atlantic Ocean, discovering several Atlantic archipelagos like the Azores, Madeira, or Cape Verde, explored the African coast as well as colonizing selected areas of Africa, discovered an eastern route to India that rounded the Cape of Good Hope, discovered Brazil, explored the Indian Ocean and established trading routes throughout most of southern Asia, and sent the first direct European maritime trade and diplomatic missions to China and Japan.