diff --git a/sdrbase/dsp/spectrummarkers.cpp b/sdrbase/dsp/spectrummarkers.cpp
index ac95c4f54..5a497c694 100644
--- a/sdrbase/dsp/spectrummarkers.cpp
+++ b/sdrbase/dsp/spectrummarkers.cpp
@@ -1,9 +1,6 @@
///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2021 Edouard Griffiths, F4EXB //
// //
-// Symbol synchronizer or symbol clock recovery mostly encapsulating //
-// liquid-dsp's symsync "object" //
-// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
diff --git a/sdrbase/dsp/spectrummarkers.h b/sdrbase/dsp/spectrummarkers.h
index 02d601c2d..00b90f2ca 100644
--- a/sdrbase/dsp/spectrummarkers.h
+++ b/sdrbase/dsp/spectrummarkers.h
@@ -1,9 +1,6 @@
///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2021 Edouard Griffiths, F4EXB //
// //
-// Symbol synchronizer or symbol clock recovery mostly encapsulating //
-// liquid-dsp's symsync "object" //
-// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
diff --git a/sdrbase/dsp/spectrumvis.cpp b/sdrbase/dsp/spectrumvis.cpp
index 093a157c5..a0fd79a0b 100644
--- a/sdrbase/dsp/spectrumvis.cpp
+++ b/sdrbase/dsp/spectrumvis.cpp
@@ -1,9 +1,6 @@
///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2015-2020 Edouard Griffiths, F4EXB //
// //
-// Symbol synchronizer or symbol clock recovery mostly encapsulating //
-// liquid-dsp's symsync "object" //
-// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
diff --git a/sdrbase/dsp/spectrumvis.h b/sdrbase/dsp/spectrumvis.h
index 26194ab81..5a3a16ac7 100644
--- a/sdrbase/dsp/spectrumvis.h
+++ b/sdrbase/dsp/spectrumvis.h
@@ -1,9 +1,6 @@
///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2015-2020 Edouard Griffiths, F4EXB //
// //
-// Symbol synchronizer or symbol clock recovery mostly encapsulating //
-// liquid-dsp's symsync "object" //
-// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
diff --git a/sdrbase/dsp/symsync.cpp b/sdrbase/dsp/symsync.cpp
deleted file mode 100644
index d523c3421..000000000
--- a/sdrbase/dsp/symsync.cpp
+++ /dev/null
@@ -1,96 +0,0 @@
-///////////////////////////////////////////////////////////////////////////////////
-// Copyright (C) 2018 Edouard Griffiths, F4EXB //
-// //
-// Symbol synchronizer or symbol clock recovery mostly encapsulating //
-// liquid-dsp's symsync "object" //
-// //
-// This program is free software; you can redistribute it and/or modify //
-// it under the terms of the GNU General Public License as published by //
-// the Free Software Foundation as version 3 of the License, or //
-// (at your option) any later version. //
-// //
-// This program is distributed in the hope that it will be useful, //
-// but WITHOUT ANY WARRANTY; without even the implied warranty of //
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
-// GNU General Public License V3 for more details. //
-// //
-// You should have received a copy of the GNU General Public License //
-// along with this program. If not, see . //
-///////////////////////////////////////////////////////////////////////////////////
-
-#include "symsync.h"
-
-SymbolSynchronizer::SymbolSynchronizer()
-{
- // For now use hardcoded values:
- // - RRC filter
- // - 4 samples per symbol
- // - 5 symbols delay filter
- // - 0.5 filter excess bandwidth factor
- // - 32 filter elements for the internal polyphase filter
- m_sync = symsync_crcf_create_rnyquist(LIQUID_FIRFILT_RRC, 4, 5, 0.5f, 32);
- // - 0.02 loop filter bandwidth factor
- symsync_crcf_set_lf_bw(m_sync, 0.01f);
- // - 4 samples per symbol output rate
- symsync_crcf_set_output_rate(m_sync, 4);
- m_syncSampleCount = 0;
-}
-
-SymbolSynchronizer::~SymbolSynchronizer()
-{
- symsync_crcf_destroy(m_sync);
-}
-
-Real SymbolSynchronizer::run(const Sample& s)
-{
- unsigned int nn;
- Real v = -1.0f;
- liquid_float_complex y = (s.m_real / SDR_RX_SCALEF) + (s.m_imag / SDR_RX_SCALEF)*I;
- symsync_crcf_execute(m_sync, &y, 1, m_z, &nn);
-
- for (unsigned int i = 0; i < nn; i++)
- {
- if (nn != 1) {
- qDebug("SymbolSynchronizer::run: %u", nn);
- }
-
- if (m_syncSampleCount % 4 == 0) {
- v = 1.0f;
- }
-
- if (m_syncSampleCount < 4095) {
- m_syncSampleCount++;
- } else {
- qDebug("SymbolSynchronizer::run: tau: %f", symsync_crcf_get_tau(m_sync));
- m_syncSampleCount = 0;
- }
- }
-
- return v;
-}
-
-liquid_float_complex SymbolSynchronizer::runZ(const Sample& s)
-{
- unsigned int nn;
- liquid_float_complex y = (s.m_real / SDR_RX_SCALEF) + (s.m_imag / SDR_RX_SCALEF)*I;
- symsync_crcf_execute(m_sync, &y, 1, m_z, &nn);
-
- for (unsigned int i = 0; i < nn; i++)
- {
- if (nn != 1) {
- qDebug("SymbolSynchronizer::run: %u", nn);
- }
-
- if (m_syncSampleCount == 0) {
- m_z0 = m_z[i];
- }
-
- if (m_syncSampleCount < 3) {
- m_syncSampleCount++;
- } else {
- m_syncSampleCount = 0;
- }
- }
-
- return m_z0;
-}
diff --git a/sdrbase/dsp/symsync.h b/sdrbase/dsp/symsync.h
deleted file mode 100644
index c86450a56..000000000
--- a/sdrbase/dsp/symsync.h
+++ /dev/null
@@ -1,39 +0,0 @@
-///////////////////////////////////////////////////////////////////////////////////
-// Copyright (C) 2018 Edouard Griffiths, F4EXB //
-// //
-// Symbol synchronizer or symbol clock recovery mostly encapsulating //
-// liquid-dsp's symsync "object" //
-// //
-// This program is free software; you can redistribute it and/or modify //
-// it under the terms of the GNU General Public License as published by //
-// the Free Software Foundation as version 3 of the License, or //
-// (at your option) any later version. //
-// //
-// This program is distributed in the hope that it will be useful, //
-// but WITHOUT ANY WARRANTY; without even the implied warranty of //
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
-// GNU General Public License V3 for more details. //
-// //
-// You should have received a copy of the GNU General Public License //
-// along with this program. If not, see . //
-///////////////////////////////////////////////////////////////////////////////////
-
-#include "dsp/dsptypes.h"
-#include "liquid.h"
-#include
-
-class SymbolSynchronizer
-{
-public:
- SymbolSynchronizer();
- ~SymbolSynchronizer();
-
- Real run(const Sample& s);
- liquid_float_complex runZ(const Sample& s);
-
-private:
- symsync_crcf m_sync;
- liquid_float_complex m_z[4+4]; // 4 samples per symbol. One symbol plus extra space
- liquid_float_complex m_z0;
- int m_syncSampleCount;
-};