VE7UWU/sdrangel
1
0
Fork 0
mirror of https://github.com/f4exb/sdrangel.git synced 2024-11-22 08:04:49 -05:00
Code Issues Projects Releases Wiki Activity

RTTY demod: Fix so mark is high RF freq. Fix squelch.

Browse Source
This commit is contained in:
Jon Beniston 2023-09-04 09:33:42 +01:00
parent a5214e3002
commit ba01da7827
2 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
plugins/channelrx/demodrtty/readme.md
View File

@ -79,7 +79,12 @@ Specifies whether bits are transmitted least-significant-bit first (LSB) or most
<h3>14: Mark/Space Frequency</h3>
When unchecked, the mark frequency is the higher frequency, when checked the space frequency is higher.
When unchecked, the mark frequency is the higher RF frequency, when checked the space frequency is higher.
This should be unchecked when transmitter is using LSB AFSK and checked for USB AFSK and DWD
[1](https://www.dwd.de/EN/specialusers/shipping/broadcast_en/brodcast_rtty_1_052014.pdf?__blob=publicationFile&v=1)
[2](https://www.dwd.de/EN/specialusers/shipping/broadcast_en/broadcast_rtty_2_052014.pdf?__blob=publicationFile&v=1)
shipping weather broadcasts.
<h3>15: Suppress CR LF</h3>

6
plugins/channelrx/demodrtty/rttydemodsink.cpp
View File

@ -154,8 +154,8 @@ void RttyDemodSink::processOneSample(Complex &ci)
m_expIdx = (m_expIdx + 1) % m_expLength;
//Complex exp = m_exp[m_sampleIdx];
//qDebug() << "IQ " << real(ci) << imag(ci);
Complex corr1 = ci * exp;
Complex corr2 = ci * std::conj(exp);
Complex corr1 = ci * std::conj(exp); // Conj is high/mark freq (as for matched filter, we need to time reverse and take conjugate)
Complex corr2 = ci * exp; // Low/space freq
// Filter
Real abs1, abs2;
@ -238,6 +238,8 @@ void RttyDemodSink::processOneSample(Complex &ci)
m_clockCount = 0;
m_clock = false;
m_cycleCount = 0;
m_rssiMagSqSum = 0.0;
m_rssiMagSqCount = 0;
}
}
else