Filtr audio ADSP z Aliexpress
ADSP FDS-02 filtr audio za niecałe 76$
https://www.aliexpress.com/item/2016-DSP-Digital-Filter-for-SSB-CW-Amateur-Radio-Communications-Ham-BY-BG5ROJ/32829703536.html?spm=a2g0s.9042311.0.0.h8U1Jv
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