Good morning, I have a USB to Serial Adapter, but when I use it generates a noise in my radio on all bands. RF Chokes already tried with no success. Would isolate this noise? The adapter is:: http://www.solucaocabos.com.br/loja/produtos/p_USB%20serial%20leadership.jpg Thank you for your attention, and answers !!! -- *Flávio Maielo PY4EK*