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Консультация № 199118
02.09.2020, 00:34
0.00 руб.
22.09.2020, 06:34
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2
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Мощность излучения антенны с КУ=10 на частоте 30 МГц составляет 15 Вт. Какой КУ должна иметь приемная антенна, установленная на расстоянии 1 км от передающей, чтобы максимальная мощность принимаемого сигнала была равна 1 мВт? Показать рисунок.
Мощность излучения антенны с КУ=10 на частоте 30 МГц составляет 15 Вт. Какой КУ должна иметь приемная антенна, установленная на расстоянии 1 км от передающей, чтобы максимальная мощность принимаемого сигнала была равна 1 мВт? Показать рисунок.
Обсуждение
03.09.2020, 10:18
общий
Адресаты:
Вы создали примерно десяток консультаций на тему "Антенно-фидерные устройства".
Я мог бы решить несколько задач, но за 45 лет после моей учёбы я забыл экзотические формулы. Искать их в загаженном рекламами рунете не хочется. Я ещё не очистил ранее-скаченные статьи, занимаюсь чисткой.
У Вас перед получением этих задач должны быть какие-то учебники. Вы не постарались приложить методичку к задачам, чтоб облегчить работу экспертам, а наоборот, нагружаете экспертов своими дополнительными капризами "Показать рисунок".
Какой Вам рисунок? Антенны? Разбаловал Вас Андрей Владимирович.
Я мог бы решить несколько задач, но за 45 лет после моей учёбы я забыл экзотические формулы. Искать их в загаженном рекламами рунете не хочется. Я ещё не очистил ранее-скаченные статьи, занимаюсь чисткой.
У Вас перед получением этих задач должны быть какие-то учебники. Вы не постарались приложить методичку к задачам, чтоб облегчить работу экспертам, а наоборот, нагружаете экспертов своими дополнительными капризами "Показать рисунок".
Какой Вам рисунок? Антенны? Разбаловал Вас Андрей Владимирович.
09.09.2020, 16:09
общий
это ответ
Здравствуйте, dar777!
Максимальная мощность принимаемого сигнала P[sub]пр[/sub] связана с мощностью излучения P[sub]пер[/sub] передающей антенны с КУ, равным G[sub]пер[/sub], формулой идеальной радиопередачи:
где G[sub]пр[/sub] - КУ приёмной антенны, [$955$] - длина волны, r - расстояние между антеннами. С учётом того, что длина волны связана с её частотой f соотношением [$955$] = c/f (c [$8776$] 3[$183$]10[sup]8[/sup] м/с - скорость света), для КУ приёмной антенны имеем
В данном случае P[sub]пр[/sub] = 1 мВт = 0.001 Вт, P[sub]пер[/sub] = 15 Вт, G[sub]пер[/sub] = 10, r = 1 км = 1000 м, f = 30 МГц = 30000000 Гц, и необходимое КУ приёмной антенны будет равно
Максимальная мощность принимаемого сигнала P[sub]пр[/sub] связана с мощностью излучения P[sub]пер[/sub] передающей антенны с КУ, равным G[sub]пер[/sub], формулой идеальной радиопередачи:
где G[sub]пр[/sub] - КУ приёмной антенны, [$955$] - длина волны, r - расстояние между антеннами. С учётом того, что длина волны связана с её частотой f соотношением [$955$] = c/f (c [$8776$] 3[$183$]10[sup]8[/sup] м/с - скорость света), для КУ приёмной антенны имеем
В данном случае P[sub]пр[/sub] = 1 мВт = 0.001 Вт, P[sub]пер[/sub] = 15 Вт, G[sub]пер[/sub] = 10, r = 1 км = 1000 м, f = 30 МГц = 30000000 Гц, и необходимое КУ приёмной антенны будет равно
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