Errata: serial adapter not detected on some Linux systems solved.
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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
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\subsection*{Problem}
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Audio of transmission is heavily distorted. Sometimes the transmitter gives up altogether.
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\subsection*{Cause}
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\subsubsection*{Cause}
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Output of USB audio device contains a periodic frequency, probably the sampling frequency. This signal modulates the transmitter.
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\subsection*{Solution}
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\subsubsection*{Solution}
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Populate both capacitors C5 and C7. Together with the audio transformer, these form a filter, reducing the amplitude of the oscillation frequency.
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\subsection*{Problem}
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Under Linux, the sound card is detected, but the serial adapter is not.
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\subsubsection*{Cause}
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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.
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\subsubsection*{Solution}
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Remove BRLTTY with the following command: \textit{sudo apt autoremove brltty}. On OpenSuSe, you can use YaST to remove the package.
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\clearpage
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\section{Open source hardware and software}
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