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Какая-то СВИСТЮЛЬКА стоит на частоте......

УЛУЧШЕНИЕ ИЗБИРАТЕЛЬНОСТИ ПРИЕМНИКОВ

Простые приемники с промежуточной частотой (ПЧ) 465 кГц имеют, как правило, невысокую избирательность. Подавление нерабочей полосы в таких приемниках отсутствует или весьма незначительно.

Предлагаемая схема позволяет улучшить подавление нижней боковой полосы на 23... 24 дБ и может быть встроена практически в любой приемник с ПЧ 465 кГц. Схема содержит два смесителя на встречно-параллельных диодах и фазовращатели, описанные В.Поляковым [1].

Cxema

Настройка гетеродина производится сердечником L3 и подбором емкости СЗ. Частоту генерации нужно установить около 232 кГц. При этом в телефонах включенного приемника слышен шум, уровень которого уменьшается при ввинчивании или вы-винчивании сердечника. Ввинчивая сердечник, следует найти положение, при котором шум начинает уменьшатся, при этом частота генерации соответствует нижнему скату АЧХ УПЧ. Более точно это можно сделать при наличии ГКЧ (изме-рителя АЧХ). Подключив осциллограф или ВЧ вольтметр к отводу L4, настройте контур L5, С6 в резонанс (232 кГц). Затем подайте на вход УПЧ сигнал с ГСС, соответствующий нижней боковой полосе (460...464 кГц), и резистором R5 добейтесь минимального сигнала на выходе приемника.

Детали.

Отношение числа витков катушек L1 и L2 — 4:1...2:1. Для стандартных контуров ПЧ с ферритовыми чашками L2 имеет 15...30 витков. Для L3, L4 и L5 использованы сердечники СБ-1. L3 содержит 100 витков, L5 — 200 витков с отводом от середины, L4 — 30 витков. Провод — диаметром 0,12...0,15 мм. L6 и L7 — дроссели Д0,1 500 мкГн. L8 намотана в два провода и имеет 400...500 витков. Провод — диаметром 0,1 мм, сердечник — ШЗхб от малогабаритного трансформатора УНЧ. L9 — 300 витков провода 0,1мм на кольце К 16х8х4 2000 ИМ. Конденсаторы С2, СЗ, С4 — типа КСО.

В изготовленном приемнике получено подавление нерабочей боковой полосы не менее чем на 26 дБ. В тракте ПЧ использован пьезофильтр ФП1П-0,15.

Литература
1. Поляков В.Т. Трансиверы прямого преобразования. — М.: ДОСА-АФ, 1984.

Ю.ЗИРЮКИН (EU3AS), 225210, Брестская обл., г.Береза, а/я 29.

(РЛ 3/98)


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