diff --git a/plugins/channelrx/chanalyzer/chanalyzer.h b/plugins/channelrx/chanalyzer/chanalyzer.h
index 0fca2eb3e..a45a1d1e2 100644
--- a/plugins/channelrx/chanalyzer/chanalyzer.h
+++ b/plugins/channelrx/chanalyzer/chanalyzer.h
@@ -126,7 +126,6 @@ public:
 	virtual void stop();
 	virtual bool handleMessage(const Message& cmd);
 
-	virtual int getDeltaFrequency() const { return m_frequency; }
 	virtual void getIdentifier(QString& id) { id = objectName(); }
 	virtual void getTitle(QString& title) { title = objectName(); }
 	virtual qint64 getCenterFrequency() const { return m_frequency; }
diff --git a/plugins/channelrx/chanalyzerng/chanalyzerng.h b/plugins/channelrx/chanalyzerng/chanalyzerng.h
index 6312db19d..c80c02ca7 100644
--- a/plugins/channelrx/chanalyzerng/chanalyzerng.h
+++ b/plugins/channelrx/chanalyzerng/chanalyzerng.h
@@ -145,7 +145,6 @@ public:
 	virtual void stop();
 	virtual bool handleMessage(const Message& cmd);
 
-	virtual int getDeltaFrequency() const { return m_running.m_frequency; }
 	virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = objectName(); }
     virtual qint64 getCenterFrequency() const { return m_running.m_frequency; }
diff --git a/plugins/channelrx/demodam/amdemod.h b/plugins/channelrx/demodam/amdemod.h
index 1b838a052..1cc53dc97 100644
--- a/plugins/channelrx/demodam/amdemod.h
+++ b/plugins/channelrx/demodam/amdemod.h
@@ -93,7 +93,6 @@ public:
 	virtual void stop();
 	virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual qint64 getCenterFrequency() const { return m_settings.m_inputFrequencyOffset; }
diff --git a/plugins/channelrx/demodatv/atvdemod.h b/plugins/channelrx/demodatv/atvdemod.h
index 158b9c591..056c77fd2 100644
--- a/plugins/channelrx/demodatv/atvdemod.h
+++ b/plugins/channelrx/demodatv/atvdemod.h
@@ -224,7 +224,6 @@ public:
 	virtual void stop();
 	virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_rfRunning.m_intFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = objectName(); }
     virtual qint64 getCenterFrequency() const { return m_rfRunning.m_intFrequencyOffset; }
diff --git a/plugins/channelrx/demodbfm/bfmdemod.h b/plugins/channelrx/demodbfm/bfmdemod.h
index 456b22d8e..307e9b3ed 100644
--- a/plugins/channelrx/demodbfm/bfmdemod.h
+++ b/plugins/channelrx/demodbfm/bfmdemod.h
@@ -123,7 +123,6 @@ public:
 	virtual void stop();
 	virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual qint64 getCenterFrequency() const { return m_settings.m_inputFrequencyOffset; }
diff --git a/plugins/channelrx/demoddsd/dsddemod.h b/plugins/channelrx/demoddsd/dsddemod.h
index 6f1a7f200..0f6e55382 100644
--- a/plugins/channelrx/demoddsd/dsddemod.h
+++ b/plugins/channelrx/demoddsd/dsddemod.h
@@ -102,7 +102,6 @@ public:
 	virtual void stop();
 	virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual qint64 getCenterFrequency() const { return m_settings.m_inputFrequencyOffset; }
diff --git a/plugins/channelrx/demodlora/lorademod.h b/plugins/channelrx/demodlora/lorademod.h
index 8f64acf83..7228b3b8a 100644
--- a/plugins/channelrx/demodlora/lorademod.h
+++ b/plugins/channelrx/demodlora/lorademod.h
@@ -98,7 +98,6 @@ public:
 	virtual void stop();
 	virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return 0; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual qint64 getCenterFrequency() const { return 0; }
diff --git a/plugins/channelrx/demodssb/ssbdemod.h b/plugins/channelrx/demodssb/ssbdemod.h
index 08d855ca9..14e526850 100644
--- a/plugins/channelrx/demodssb/ssbdemod.h
+++ b/plugins/channelrx/demodssb/ssbdemod.h
@@ -112,7 +112,6 @@ public:
 	virtual void stop();
 	virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual qint64 getCenterFrequency() const { return m_settings.m_inputFrequencyOffset; }
diff --git a/plugins/channelrx/demodwfm/wfmdemod.h b/plugins/channelrx/demodwfm/wfmdemod.h
index 098114b5e..ba1f628a4 100644
--- a/plugins/channelrx/demodwfm/wfmdemod.h
+++ b/plugins/channelrx/demodwfm/wfmdemod.h
@@ -98,7 +98,6 @@ public:
 	virtual void stop();
 	virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual qint64 getCenterFrequency() const { return m_settings.m_inputFrequencyOffset; }
diff --git a/plugins/channelrx/tcpsrc/tcpsrc.h b/plugins/channelrx/tcpsrc/tcpsrc.h
index 351cc4ab9..471a8c3e7 100644
--- a/plugins/channelrx/tcpsrc/tcpsrc.h
+++ b/plugins/channelrx/tcpsrc/tcpsrc.h
@@ -115,7 +115,6 @@ public:
 	virtual void stop();
 	virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual qint64 getCenterFrequency() const { return m_settings.m_inputFrequencyOffset; }
diff --git a/plugins/channelrx/udpsrc/udpsrc.h b/plugins/channelrx/udpsrc/udpsrc.h
index 917c4d4e0..be3257465 100644
--- a/plugins/channelrx/udpsrc/udpsrc.h
+++ b/plugins/channelrx/udpsrc/udpsrc.h
@@ -107,7 +107,6 @@ public:
 	virtual void stop();
 	virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual qint64 getCenterFrequency() const { return m_settings.m_inputFrequencyOffset; }
diff --git a/plugins/channeltx/modam/ammod.h b/plugins/channeltx/modam/ammod.h
index 392c7b848..38fd35b9e 100644
--- a/plugins/channeltx/modam/ammod.h
+++ b/plugins/channeltx/modam/ammod.h
@@ -236,7 +236,6 @@ public:
     virtual void stop();
     virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual void setName(const QString& name) { setObjectName(name); }
diff --git a/plugins/channeltx/modatv/atvmod.h b/plugins/channeltx/modatv/atvmod.h
index 0c66fd872..e709a1dfd 100644
--- a/plugins/channeltx/modatv/atvmod.h
+++ b/plugins/channeltx/modatv/atvmod.h
@@ -402,7 +402,6 @@ public:
     virtual void stop();
     virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual void setName(const QString& name) { setObjectName(name); }
diff --git a/plugins/channeltx/modnfm/nfmmod.h b/plugins/channeltx/modnfm/nfmmod.h
index fa665199f..1e10abfbc 100644
--- a/plugins/channeltx/modnfm/nfmmod.h
+++ b/plugins/channeltx/modnfm/nfmmod.h
@@ -217,7 +217,6 @@ public:
     virtual void stop();
     virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual void setName(const QString& name) { setObjectName(name); }
diff --git a/plugins/channeltx/modssb/ssbmod.h b/plugins/channeltx/modssb/ssbmod.h
index b9aefa27b..1c8961c39 100644
--- a/plugins/channeltx/modssb/ssbmod.h
+++ b/plugins/channeltx/modssb/ssbmod.h
@@ -239,7 +239,6 @@ public:
     virtual void stop();
     virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual void setName(const QString& name) { setObjectName(name); }
diff --git a/plugins/channeltx/modwfm/wfmmod.h b/plugins/channeltx/modwfm/wfmmod.h
index 8ef1581ee..6731fd8fd 100644
--- a/plugins/channeltx/modwfm/wfmmod.h
+++ b/plugins/channeltx/modwfm/wfmmod.h
@@ -237,7 +237,6 @@ public:
     virtual void stop();
     virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual void setName(const QString& name) { setObjectName(name); }
diff --git a/plugins/channeltx/udpsink/udpsink.h b/plugins/channeltx/udpsink/udpsink.h
index 963965b13..71bd565c8 100644
--- a/plugins/channeltx/udpsink/udpsink.h
+++ b/plugins/channeltx/udpsink/udpsink.h
@@ -97,7 +97,6 @@ public:
     virtual void pull(Sample& sample);
     virtual bool handleMessage(const Message& cmd);
 
-    virtual int getDeltaFrequency() const { return m_absoluteFrequencyOffset; }
     virtual void getIdentifier(QString& id) { id = objectName(); }
     virtual void getTitle(QString& title) { title = m_settings.m_title; }
     virtual void setName(const QString& name) { setObjectName(name); }
diff --git a/sdrbase/channel/channelsinkapi.h b/sdrbase/channel/channelsinkapi.h
index 9df096e2c..dba578bf9 100644
--- a/sdrbase/channel/channelsinkapi.h
+++ b/sdrbase/channel/channelsinkapi.h
@@ -36,7 +36,6 @@ public:
     virtual ~ChannelSinkAPI() {}
     virtual void destroy() = 0;
 
-    virtual int getDeltaFrequency() const = 0;
     virtual void getIdentifier(QString& id) = 0;
     virtual void getTitle(QString& title) = 0;
     virtual void setName(const QString& name) { m_name = name; }
diff --git a/sdrbase/channel/channelsourceapi.h b/sdrbase/channel/channelsourceapi.h
index 7ed402448..192ee239f 100644
--- a/sdrbase/channel/channelsourceapi.h
+++ b/sdrbase/channel/channelsourceapi.h
@@ -35,7 +35,6 @@ public:
     virtual ~ChannelSourceAPI() {}
     virtual void destroy() = 0;
 
-    virtual int getDeltaFrequency() const = 0;
     virtual void getIdentifier(QString& id) = 0;
     virtual void getTitle(QString& title) = 0;
     virtual void setName(const QString& name) = 0;
diff --git a/sdrgui/webapi/webapiadaptergui.cpp b/sdrgui/webapi/webapiadaptergui.cpp
index f26bff9ec..b4d61c13d 100644
--- a/sdrgui/webapi/webapiadaptergui.cpp
+++ b/sdrgui/webapi/webapiadaptergui.cpp
@@ -1255,7 +1255,7 @@ void WebAPIAdapterGUI::getDeviceSet(SWGSDRangel::SWGDeviceSet *deviceSet, const
         {
             channels->append(new SWGSDRangel::SWGChannel);
             ChannelSourceAPI *channel = deviceUISet->m_deviceSinkAPI->getChanelAPIAt(i);
-            channels->back()->setDeltaFrequency(channel->getDeltaFrequency());
+            channels->back()->setDeltaFrequency(channel->getCenterFrequency());
             channels->back()->setIndex(channel->getIndexInDeviceSet());
             channels->back()->setUid(channel->getUID());
             channel->getIdentifier(*channels->back()->getId());
@@ -1285,7 +1285,7 @@ void WebAPIAdapterGUI::getDeviceSet(SWGSDRangel::SWGDeviceSet *deviceSet, const
         {
             channels->append(new SWGSDRangel::SWGChannel);
             ChannelSinkAPI *channel = deviceUISet->m_deviceSourceAPI->getChanelAPIAt(i);
-            channels->back()->setDeltaFrequency(channel->getDeltaFrequency());
+            channels->back()->setDeltaFrequency(channel->getCenterFrequency());
             channels->back()->setIndex(channel->getIndexInDeviceSet());
             channels->back()->setUid(channel->getUID());
             channel->getIdentifier(*channels->back()->getId());
diff --git a/sdrsrv/webapi/webapiadaptersrv.cpp b/sdrsrv/webapi/webapiadaptersrv.cpp
index 920684916..113dbec07 100644
--- a/sdrsrv/webapi/webapiadaptersrv.cpp
+++ b/sdrsrv/webapi/webapiadaptersrv.cpp
@@ -1383,7 +1383,7 @@ void WebAPIAdapterSrv::getDeviceSet(SWGSDRangel::SWGDeviceSet *swgDeviceSet, con
         {
             channels->append(new SWGSDRangel::SWGChannel);
             ChannelSourceAPI *channel = deviceSet->m_deviceSinkAPI->getChanelAPIAt(i);
-            channels->back()->setDeltaFrequency(channel->getDeltaFrequency());
+            channels->back()->setDeltaFrequency(channel->getCenterFrequency());
             channels->back()->setIndex(channel->getIndexInDeviceSet());
             channels->back()->setUid(channel->getUID());
             channel->getIdentifier(*channels->back()->getId());
@@ -1413,7 +1413,7 @@ void WebAPIAdapterSrv::getDeviceSet(SWGSDRangel::SWGDeviceSet *swgDeviceSet, con
         {
             channels->append(new SWGSDRangel::SWGChannel);
             ChannelSinkAPI *channel = deviceSet->m_deviceSourceAPI->getChanelAPIAt(i);
-            channels->back()->setDeltaFrequency(channel->getDeltaFrequency());
+            channels->back()->setDeltaFrequency(channel->getCenterFrequency());
             channels->back()->setIndex(channel->getIndexInDeviceSet());
             channels->back()->setUid(channel->getUID());
             channel->getIdentifier(*channels->back()->getId());