У футабы и санвы разная полярность РРМ и разная раскладка каналов.
Если с полярностью можно справиться довольно просто - инвертировать её каскадом на одном транзисторе с общим эммитером, то для изменения поканальной раскладки нужен хороший тренерский передатчик, котогрый умеет переназначать каналы ученика.
Или действительно, придётся городить свой собственный затейливый процессор, как совершенно справедливо выше отметил коллега.
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