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uSDX
SO5WI Offline


Liczba postów: 8
Dołączył: 22-05-2014
Post: #263
RE: uSDX
(20-10-2021 12:29)SP2JQR napisał(a):  Problem złej liniowości w bramce jest znany od samego początku. Podobno autor softu miał tabelę korekcyjną, o którą już dawno pytałem tu: http://sp-hm.pl/thread-3992-post-46143.html#pid46143
Prawdopodobnie w kolejnych wersjach została usunięta, bo nie było miejsca w pamięci na inne bajery.
Wiem też, że autor w pierwszych próbach robił modulację w drenie, ale z niej zrezygnował w celu uproszczenia radia.
Wychodzi na to, że trzeba wrócić do pierwowzoru. Wydaje mi się, że jako modulator można też wykorzystać wzmacniacz m.cz. wykonany w klasie D po drobnych przeróbkach.
Moje próby takiej modulacji polegały na bezpośrednim sterowaniu wzmocnionym PWM procesora tranzystora IRF9540. Zatrzymałem się na filtrze, który musi być zrobiony na dużą moc.

Czy masz może kawałek schematu modulacji w drenie?
01-02-2022 19:05
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