📄 qpsk decoder.htm
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<CENTER><STRONG><FONT size=5>QPSK Decoder</FONT></STRONG></CENTER></H1>
<BLOCKQUOTE>
<BLOCKQUOTE><B><FONT size=5>
<P>General description</P></FONT></B>
<P align=justify>The QPSK decoder supports soft bit Viterbi decoding. The
decoder uses the most modern digital PLL synchronization technology for bit
synchronization and a neural network for detection. It prints QPSK varicode
characters on the screen. It searches the QPSK transmission within the given
frequency boundaries. Also you can set the decoded frequency by double
clicking the mouse on the required frequency position.</P>
<P align=justify> </P>
<P align=justify>When QPSK transmission has been detected at some frequency
within the given range, the decoder will then lock itself to that frequency.
When locked, the decoder draws a bold blue line on the spectrum display, at
the currently locked frequency. If the decoder is not locked, then the blue
line is not shown as bold. After locking the frequency, the decoder starts
to estimate the keying parameters of the transmission. When all the
parameters have been estimated, then the decoder starts to print characters
on the screen.</P>
<P align=justify> </P>
<P align=justify>In the locked state, the carrier frequency is automatically
monitored within the given frequency boundaries. If the carrier frequency
changes, then the decoder moves to the new frequency. If 'Lock' is pressed
in the user interface, then the decoder will not automatically change its
frequency. When 慤nLock⌨️ 快捷键说明
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