Можливо я помиляюсь але ця апаратура є модифікацією апаратури Сигнал ФМ 7
на 27ФМ там кварц передатчика був розрахований на половину частоти
передачі 13,56 МГц (передатчик подвоює частоту).
Есть 13557.5 но нет кварца на приёмник.
Чтобы узнать какой кварц нужен на приемник нужно 13557.5х2=27.115-455=26.66 Мгц. Думаю так правильно кварц на приемник нужен частотой 26.66 Мгц.,хотя правом на истину не обладаю.
Если у вас есть такой кварц то скорее всего что он с промежуточной частотой 465 кгц.
У MFFS ПЧ в приёмнике 455кГц, а у Сигнала 465кГц. Других отличий кроме цветового оформления не обнаружены.
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