http://moonbouncers.org/Circularly%20polarized%20patch%20feed%20for%201296%20MHz_A.pdf - кто использует такой способ приема?
Обратился ко мне радиолюбитель с вопросом о фазовых сдвигах в LNA 23cm.
Какой сдвиг фазы между двумя LNA можно допустить?
Ниже текст его письма:
I am using an SM6FHZ circularly polarised patch feed that has two outputs which are 90 degrees out of phase for circular polarisation which I currently feed into a 90 degree hybrid coupler then into the pre amp.
However the coupler introduces a large insertion loss before the pre amp. So I was intending to use two preamps and then put the hybrid coupler after the preamps to improve the receive performance.
I was wondering if two preamps were from the same batch would likely be quite close in their phase matching or not.
Если использовать два канала SDR приемника, сумматор не нужен. Требования к фазовым сдвигам в каналах приема те же?