Охота на лис: возьмите радио в парк на прогулку (часть 2)
Перевод статьи Keith Witney VE7MID (Canada).
Часть 2.
Антенны диапазона 2 метра
Конструкция WB2HOL с элементами из стальной ленты от рулетки.
Версия VE7CGE выполнена из сантехнических компонентов и ленты от старой рулетки.
Очень точные пеленги.
Острая диаграмма направленности и хорошее соотношение вперед/назад.
Легко перегружается сильным сигналом.
Пеленгование по минимуму острее, чем по «громкому» направлению
Для поиска слабых сигналов можно пеленговать по максимуму с потерей точности пеленгов.
Направленная. Усиление 5 dB. Компактная и легкая. Проста в изготовлении.
50 Ом. Широкополосная. Отличное соотношение вперед/назад.
Расчет выполнен в L. B. Cebik Moxon Calculator
tool.
Вариант антенны типа HB9CV от VA7KBA (совместно с VK3YNG “нюхач”).
Небольшие размеры, кардиоидная диаграмма направленности, элементы из рулетки.
В процессе разработки.
TDOA — антенна. Работает по принципу измерения разницы во времени поступления сигнала.
Принцип Double Ducky (комбинация двух ненаправленных антенн).
Простая.
Тон (?) не зависит от мощности сигнала.
Острый минимум. Не требуется аттенюатор.
Двунаправленная диаграмма, но можно ввести кардиоидный режим с помощью линии задержки.
Аттенюатор для диапазона 2 метра.
Аттенюатор «смещения».
2/4 МГц генератор со смещающим диодом.
Смещает принимаемую частоту на 2/4 МГц и обеспечивает различную степень подавления сигнала.
(Примечание переводчика : принцип работы такого аттенюатора похож на конвертер — происходит смещение частоты поступающего на вход приемника сигнала за пределы принимаемой полосы, подробнее здесь)
Пример от K0OV. Можно использовать простой генератор на основе CMOS инвертора и кварцевого резонатора на 4 МГц (VE7MID).
Доступен в виде набора.
Ступенчатый аттенюатор 100 dB.
Сложно обеспечить качественную изоляцию (экранирование) при домашнем изготовлении.
Имеется в наличии некоторое количество излишков.
Передатчик для спортивной радиопеленгации диапазона 2 метра
Использована старая портативка с простым контроллером.
VE7CGE и VA7KBA модернизировали решение обеспечив канал для удаленного включения/выключения.
Будем благодарны за пожертвования в виде старых портативок.
Размещается в коробке для боезапаса с батареей, приемной и передающей антеннами.
Мощность 0,25-1 Вт. Передающая антенна — горизонтальный диполь, приемная антенна — вертикальный диполь.
(Продолжение следует)
7/8/2010 NSARC 20100708
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[…]Sites of interest we’ve a link to[…]