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Здравствуйте! Прошу помощи в следующем вопросе: Помогите пожалуйста решить задачу ! Нужно очень срочно ! До завтра !
Определить, какие частоты имеют гетеродины (маломощные генераторы гармонических сигналов): 1. В радиопередатчике, если частота несущего колебания на входе амплитудного модулятора f0 = 5*104 [Гц], а несущая АМ радиосигнала fn = |k| *107[Гц]. 2. В радиоприемнике, который принимает этот радиосигнал, и его основной усилитель – усилитель промежуточной частоты, настроен на fпр = 465*103 [Гц].
Обсуждение
Неизвестный
17.12.2011, 19:19
общий
18.12.2011, 01:44
ПОСМОТРИТЕ ЕЩЕ ПОЖАЛУЙСТА ВОТ ЭТИ ВОПРОСЫ !
https://rfpro.ru/question/184814 https://rfpro.ru/quick/329/08bddbbe3a7a584a083715bd26dd010f тут
Добавил их не в тот раздел ! И там их никто не решает !
А можете как-нибудь передать методички по https://rfpro.ru/question/184814 и https://rfpro.ru/quick/329/08bddbbe3a7a584a083715bd26dd010f? А с передатчиком неясно, что такое |k|.
В общем случае в преобразователе частоты (частью которого является гетеродин) происходит умножение полезного сигнала с частотой f[sub]0[/sub] и некоторого опорного напряжения гетеродина с частотой f[sub]г[/sub], отличной от частоты сигнала на некоторую величину. В результате формируется напряжение промежуточной частоты, численно равной f[sub]пр[/sub] = |m·f[sub]0[/sub][$177$]n·f[sub]г[/sub]|, где m, n - целые числа.
В данном случае для радиопередатчика f[sub]0[/sub] = 50 кГц = 0.05 МГц и f[sub]пр[/sub] = 220 МГц (повышение частоты). Полагая m = n =1, получаем f[sub]г[/sub] = f[sub]пр[/sub] + f[sub]0[/sub] = 220 + 0.05 = 220.05 МГц.
Для радиоприёмника имеем f[sub]0[/sub] = 220 МГц и f[sub]пр[/sub] = 465 кГц = 0.465 МГц (понижение частоты), откуда f[sub]г[/sub] = f[sub]пр[/sub] + f[sub]0[/sub] = 220 + 0.465 = 220.465 МГц.
В общем случае в преобразователе частоты (частью которого является гетеродин) происходит умножение полезного сигнала с частотой f[sub]0[/sub] и некоторого опорного напряжения гетеродина с частотой f[sub]г[/sub], отличной от частоты сигнала на некоторую величину. В результате формируется напряжение промежуточной частоты, численно равной f[sub]пр[/sub] = |m·f[sub]0[/sub][$177$]n·f[sub]г[/sub]|, где m, n - целые числа.
В данном случае для радиопередатчика f[sub]0[/sub] = 50 кГц = 0.05 МГц и f[sub]пр[/sub] = 220 МГц (повышение частоты). Полагая m = n =1, получаем f[sub]г[/sub] = f[sub]пр[/sub] + f[sub]0[/sub] = 220 + 0.05 = 220.05 МГц.
Для радиоприёмника имеем f[sub]0[/sub] = 220 МГц и f[sub]пр[/sub] = 465 кГц = 0.465 МГц (понижение частоты), откуда f[sub]г[/sub] = f[sub]пр[/sub] + f[sub]0[/sub] = 220 + 0.465 = 220.465 МГц.
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