Errata: serial adapter not detected on some Linux systems solved.

master
marcel 2 years ago
parent 730008fe55
commit 24361b2ecb
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[]\OT1/cmr/m/n/10 This doc-u-ment is pub-lished un-der the Cre-ative Com-mons A
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@ -393,12 +393,21 @@ There are endless ways to enclose the \textit{rig interface MK2}. You can buy a
\subsection*{Problem}
Audio of transmission is heavily distorted. Sometimes the transmitter gives up altogether.
\subsection*{Cause}
\subsubsection*{Cause}
Output of USB audio device contains a periodic frequency, probably the sampling frequency. This signal modulates the transmitter.
\subsection*{Solution}
\subsubsection*{Solution}
Populate both capacitors C5 and C7. Together with the audio transformer, these form a filter, reducing the amplitude of the oscillation frequency.
\subsection*{Problem}
Under Linux, the sound card is detected, but the serial adapter is not.
\subsubsection*{Cause}
BRLTTY silently blocks CH340 USB driver. BRLTTY is a braille display driver for Linux/Unix. If you do not use braille devices, it can be safely removed.
\subsubsection*{Solution}
Remove BRLTTY with the following command: \textit{sudo apt autoremove brltty}. On OpenSuSe, you can use YaST to remove the package.
\clearpage
\section{Open source hardware and software}

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