From 3f906baf1f10ae23ad66b53d4fc34fde439ce869 Mon Sep 17 00:00:00 2001
From: srcejon <jon@beniston.com>
Date: Thu, 7 Sep 2023 09:43:12 +0100
Subject: [PATCH] Tidy up. Add docs.

---
 doc/img/PSK31Mod_plugin.png                   | Bin 0 -> 9719 bytes
 plugins/channeltx/modpsk31/psk31modgui.cpp    |  16 +-----
 plugins/channeltx/modpsk31/psk31modgui.h      |   3 +-
 plugins/channeltx/modpsk31/psk31modgui.ui     |  53 ++++++------------
 .../channeltx/modpsk31/psk31modsettings.cpp   |   6 +-
 plugins/channeltx/modpsk31/psk31modsource.cpp |  19 +------
 plugins/channeltx/modpsk31/psk31modsource.h   |   6 +-
 .../modpsk31/psk31modtxsettingsdialog.ui      |   4 +-
 plugins/channeltx/modpsk31/readme.md          |   2 +
 9 files changed, 33 insertions(+), 76 deletions(-)
 create mode 100644 doc/img/PSK31Mod_plugin.png

diff --git a/doc/img/PSK31Mod_plugin.png b/doc/img/PSK31Mod_plugin.png
new file mode 100644
index 0000000000000000000000000000000000000000..52be4349671a1d1ffcad3bc11fae8c7f433acce2
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literal 0
HcmV?d00001

diff --git a/plugins/channeltx/modpsk31/psk31modgui.cpp b/plugins/channeltx/modpsk31/psk31modgui.cpp
index 8b5f82d8a..8cb285c2e 100644
--- a/plugins/channeltx/modpsk31/psk31modgui.cpp
+++ b/plugins/channeltx/modpsk31/psk31modgui.cpp
@@ -113,7 +113,6 @@ bool PSK31GUI::handleMessage(const Message& message)
         }
         ui->txButton->setToolTip(tooltip);
 
-        s = s.replace(">", "");  // Don't display LTRS
         s = s.replace("\r", ""); // Don't display carriage returns
 
         if (!s.isEmpty())
@@ -186,7 +185,7 @@ void PSK31GUI::on_deltaFrequency_changed(qint64 value)
 void PSK31GUI::on_rfBW_valueChanged(int value)
 {
     int bw = value;
-    ui->rfBWText->setText(formatFrequency(bw));
+    ui->rfBWText->setText(QString("%1 Hz").arg(bw));
     m_channelMarker.setBandwidth(bw);
     m_settings.m_rfBandwidth = bw;
     applySettings();
@@ -444,15 +443,6 @@ void PSK31GUI::applySettings(bool force)
     }
 }
 
-QString PSK31GUI::formatFrequency(int frequency) const
-{
-    QString suffix = "";
-    if (width() > 450) {
-        suffix = " Hz";
-    }
-    return QString("%1%2").arg(frequency).arg(suffix);
-}
-
 QString PSK31GUI::substitute(const QString& text)
 {
     const MainSettings& mainSettings = MainCore::instance()->getSettings();
@@ -483,14 +473,14 @@ void PSK31GUI::displaySettings()
 
     ui->deltaFrequency->setValue(m_channelMarker.getCenterFrequency());
 
-    ui->rfBWText->setText(formatFrequency(m_settings.m_rfBandwidth));
+    ui->rfBWText->setText(QString("%1 Hz").arg(m_settings.m_rfBandwidth));
     ui->rfBW->setValue(m_settings.m_rfBandwidth);
 
     ui->udpEnabled->setChecked(m_settings.m_udpEnabled);
     ui->udpAddress->setText(m_settings.m_udpAddress);
     ui->udpPort->setText(QString::number(m_settings.m_udpPort));
 
-    ui->gainText->setText(QString("%1").arg((double)m_settings.m_gain, 0, 'f', 1));
+    ui->gainText->setText(QString("%1dB").arg((double)m_settings.m_gain, 0, 'f', 1));
     ui->gain->setValue(m_settings.m_gain);
 
     ui->channelMute->setChecked(m_settings.m_channelMute);
diff --git a/plugins/channeltx/modpsk31/psk31modgui.h b/plugins/channeltx/modpsk31/psk31modgui.h
index 25115fa0c..3e6be55b6 100644
--- a/plugins/channeltx/modpsk31/psk31modgui.h
+++ b/plugins/channeltx/modpsk31/psk31modgui.h
@@ -77,7 +77,7 @@ private:
     QString m_initialToolTip;
 
     PSK31* m_psk31Mod;
-    MovingAverageUtil<double, double, 2> m_channelPowerDbAvg; // Less than other mods, as packets are short
+    MovingAverageUtil<double, double, 20> m_channelPowerDbAvg;
 
     MessageQueue m_inputMessageQueue;
 
@@ -88,7 +88,6 @@ private:
     void blockApplySettings(bool block);
     void applySettings(bool force = false);
     void displaySettings();
-    QString formatFrequency(int frequency) const;
     bool handleMessage(const Message& message);
     void makeUIConnections();
     void updateAbsoluteCenterFrequency();
diff --git a/plugins/channeltx/modpsk31/psk31modgui.ui b/plugins/channeltx/modpsk31/psk31modgui.ui
index bcd498b6a..e02bae250 100644
--- a/plugins/channeltx/modpsk31/psk31modgui.ui
+++ b/plugins/channeltx/modpsk31/psk31modgui.ui
@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>396</width>
-    <height>702</height>
+    <height>700</height>
    </rect>
   </property>
   <property name="sizePolicy">
@@ -43,7 +43,7 @@
      <x>2</x>
      <y>2</y>
      <width>391</width>
-     <height>211</height>
+     <height>161</height>
     </rect>
    </property>
    <property name="minimumSize">
@@ -213,19 +213,19 @@
          <string>RF bandwidth</string>
         </property>
         <property name="minimum">
-         <number>1</number>
-        </property>
-        <property name="maximum">
-         <number>2000</number>
-        </property>
-        <property name="singleStep">
          <number>10</number>
         </property>
+        <property name="maximum">
+         <number>500</number>
+        </property>
+        <property name="singleStep">
+         <number>1</number>
+        </property>
         <property name="pageStep">
-         <number>100</number>
+         <number>10</number>
         </property>
         <property name="value">
-         <number>340</number>
+         <number>100</number>
         </property>
         <property name="orientation">
          <enum>Qt::Horizontal</enum>
@@ -241,7 +241,7 @@
          </size>
         </property>
         <property name="text">
-         <string>1700</string>
+         <string>500 Hz</string>
         </property>
         <property name="alignment">
          <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
@@ -429,30 +429,6 @@
         </property>
        </spacer>
       </item>
-     </layout>
-    </item>
-    <item>
-     <widget class="Line" name="line_6">
-      <property name="orientation">
-       <enum>Qt::Horizontal</enum>
-      </property>
-     </widget>
-    </item>
-    <item>
-     <layout class="QHBoxLayout" name="callsignLayout">
-      <item>
-       <spacer name="horizontalSpacerSettings">
-        <property name="orientation">
-         <enum>Qt::Horizontal</enum>
-        </property>
-        <property name="sizeHint" stdset="0">
-         <size>
-          <width>40</width>
-          <height>20</height>
-         </size>
-        </property>
-       </spacer>
-      </item>
       <item>
        <widget class="ButtonSwitch" name="repeat">
         <property name="toolTip">
@@ -483,6 +459,13 @@
       </item>
      </layout>
     </item>
+    <item>
+     <widget class="Line" name="line_6">
+      <property name="orientation">
+       <enum>Qt::Horizontal</enum>
+      </property>
+     </widget>
+    </item>
     <item>
      <layout class="QHBoxLayout" name="packetDataLayout">
       <item>
diff --git a/plugins/channeltx/modpsk31/psk31modsettings.cpp b/plugins/channeltx/modpsk31/psk31modsettings.cpp
index e6a2e2f05..51b7eeba0 100644
--- a/plugins/channeltx/modpsk31/psk31modsettings.cpp
+++ b/plugins/channeltx/modpsk31/psk31modsettings.cpp
@@ -36,7 +36,7 @@ void PSK31Settings::resetToDefaults()
 {
     m_inputFrequencyOffset = 0;
     m_baud = 31.25;
-    m_rfBandwidth = 340;
+    m_rfBandwidth = 100;
     m_gain = 0.0f;
     m_channelMute = false;
     m_repeat = false;
@@ -52,7 +52,7 @@ void PSK31Settings::resetToDefaults()
         "UR 599 QTH IS ${location}",
         "TU DE ${callsign} CQ"
     });
-    m_rgbColor = QColor(180, 205, 130).rgb();
+    m_rgbColor = QColor(25, 180, 200).rgb();
     m_title = "PSK31 Modulator";
     m_streamIndex = 0;
     m_useReverseAPI = false;
@@ -139,7 +139,7 @@ bool PSK31Settings::deserialize(const QByteArray& data)
         d.readS32(1, &tmp, 0);
         m_inputFrequencyOffset = tmp;
         d.readReal(2, &m_baud, 31.25f);
-        d.readS32(3, &m_rfBandwidth, 340);
+        d.readS32(3, &m_rfBandwidth, 100);
         d.readReal(5, &m_gain, 0.0f);
         d.readBool(6, &m_channelMute, false);
         d.readBool(7, &m_repeat, false);
diff --git a/plugins/channeltx/modpsk31/psk31modsource.cpp b/plugins/channeltx/modpsk31/psk31modsource.cpp
index 2b8b483d1..06cde3e3c 100644
--- a/plugins/channeltx/modpsk31/psk31modsource.cpp
+++ b/plugins/channeltx/modpsk31/psk31modsource.cpp
@@ -30,7 +30,6 @@ PSK31Source::PSK31Source() :
     m_channelSampleRate(48000),
     m_channelFrequencyOffset(0),
     m_spectrumRate(2000),
-    m_fmPhase(0.0),
     m_spectrumSink(nullptr),
     m_specSampleBufferIndex(0),
     m_magsq(0.0),
@@ -42,8 +41,8 @@ PSK31Source::PSK31Source() :
     m_bitCount(0)
  {
     m_bits.append(0);
-    m_lowpass.create(301, m_channelSampleRate, 400.0 / 2.0);
-    m_pulseShape.create(0.5, 6, m_channelSampleRate / 45.45, true);
+    m_lowpass.create(301, m_channelSampleRate, 100.0 / 2.0);
+    m_pulseShape.create(0.5, 6, m_channelSampleRate / 31.25, true);
 
     m_demodBuffer.resize(1<<12);
     m_demodBufferFill = 0;
@@ -258,8 +257,6 @@ void PSK31Source::applySettings(const PSK31Settings& settings, bool force)
 
     m_settings = settings;
 
-    // Precalculate FM sensensity and linear gain to save doing it in the loop
-    m_phaseSensitivity = 2.0f * M_PI * 1100 / (double)m_channelSampleRate;
     m_linearGain = powf(10.0f,  m_settings.m_gain/20.0f);
 }
 
@@ -303,9 +300,6 @@ void PSK31Source::applyChannelSettings(int channelSampleRate, int channelFrequen
     m_samplesPerSymbol = m_channelSampleRate / m_settings.m_baud;
     qDebug() << "m_samplesPerSymbol: " << m_samplesPerSymbol << " (" << m_channelSampleRate << "/" << m_settings.m_baud << ")";
 
-    // Precalculate FM sensensity to save doing it in the loop
-    m_phaseSensitivity = 2.0f * M_PI * 1100 / (double)m_channelSampleRate;
-
     QList<ObjectPipe*> pipes;
     MainCore::instance()->getMessagePipes().getMessagePipes(m_channel, "reportdemod", pipes);
 
@@ -349,7 +343,6 @@ void PSK31Source::addBit(int bit)
     m_bits[m_byteIdx] |= bit << m_bitIdx;
     m_bitIdx++;
     m_bitCount++;
-    m_bitCountTotal++;
     if (m_bitIdx == 8)
     {
         m_byteIdx++;
@@ -364,8 +357,6 @@ void PSK31Source::initTX()
 {
     m_byteIdx = 0;
     m_bitIdx = 0;
-    m_bitCount = m_bitCountTotal; // Reset to allow retransmission
-    m_bit = 0;
 }
 
 void PSK31Source::addTXText(QString text)
@@ -377,7 +368,7 @@ void PSK31Source::addTXText(QString text)
         QString s = text;
 
         if (m_settings.m_prefixCRLF) {
-            s.prepend("\r\r\n>"); // '>' switches to letters
+            s.prepend("\r\r\n");
         }
         if (m_settings.m_postfixCRLF) {
             s.append("\r\r\n");
@@ -393,7 +384,6 @@ void PSK31Source::encodeText(const QString& text)
     m_byteIdx = 0;
     m_bitIdx = 0;
     m_bitCount = 0;
-    m_bitCountTotal = 0;
     for (int i = 0; i < m_bits.size(); i++) {
         m_bits[i] = 0;
     }
@@ -423,12 +413,9 @@ void PSK31Source::encodeIdle()
     m_byteIdx = 0;
     m_bitIdx = 0;
     m_bitCount = 0;
-    m_bitCountTotal = 0;
     for (int i = 0; i < m_bits.size(); i++) {
         m_bits[i] = 0;
     }
     addBit(0);
     addBit(0);
-    addBit(0);
-    addBit(0);
 }
diff --git a/plugins/channeltx/modpsk31/psk31modsource.h b/plugins/channeltx/modpsk31/psk31modsource.h
index 7313ba094..2c0db32a0 100644
--- a/plugins/channeltx/modpsk31/psk31modsource.h
+++ b/plugins/channeltx/modpsk31/psk31modsource.h
@@ -70,15 +70,12 @@ private:
     ChannelAPI *m_channel;
 
     NCO m_carrierNco;
-    double m_fmPhase;                   // Double gives cleaner spectrum than Real
-    double m_phaseSensitivity;
     Real m_linearGain;
     Complex m_modSample;
 
     int m_bit;                          // Current bit
-    int m_prevBit;                      // Previous bit, for differential encoding
     int m_symbol;                       // Current symbol
-    int m_prevSymbol;
+    int m_prevSymbol;                   // Previous symbol for differential encoding
     RaisedCosine<Real> m_pulseShape;    // Pulse shaping filter
     Lowpass<Complex> m_lowpass;         // Low pass filter to limit RF bandwidth
 
@@ -113,7 +110,6 @@ private:
     int m_byteIdx;                      // Index in to m_bits
     int m_bitIdx;                       // Index in to current byte of m_bits
     int m_bitCount;                     // Count of number of valid bits in m_bits
-    int m_bitCountTotal;
 
     QVector<qint16> m_demodBuffer;
     int m_demodBufferFill;
diff --git a/plugins/channeltx/modpsk31/psk31modtxsettingsdialog.ui b/plugins/channeltx/modpsk31/psk31modtxsettingsdialog.ui
index 579a7f6f9..31f63eb67 100644
--- a/plugins/channeltx/modpsk31/psk31modtxsettingsdialog.ui
+++ b/plugins/channeltx/modpsk31/psk31modtxsettingsdialog.ui
@@ -29,10 +29,10 @@
       <item row="0" column="0" colspan="2">
        <widget class="QCheckBox" name="prefixCRLF">
         <property name="toolTip">
-         <string>Prefix text with carriage returns, line feed and switch to letters</string>
+         <string>Prefix text with carriage returns and line feed</string>
         </property>
         <property name="text">
-         <string>Prefix CR+CR+LF+LTRS</string>
+         <string>Prefix CR+CR+LF</string>
         </property>
        </widget>
       </item>
diff --git a/plugins/channeltx/modpsk31/readme.md b/plugins/channeltx/modpsk31/readme.md
index cf7e44e66..31fa1eecb 100644
--- a/plugins/channeltx/modpsk31/readme.md
+++ b/plugins/channeltx/modpsk31/readme.md
@@ -63,6 +63,8 @@ Enter text to transmit. Pressing return will transmit the text and clear this fi
 
 The list of pre-defined text can be customised via the Transmit Settings dialog (13).
 
+PSK31 supports the extended ASCII character set.
+
 <h3>13: TX</h3>
 
 Press to transmit the current text. The text field will not be cleared.