diff --git a/grc/CMakeLists.txt b/grc/CMakeLists.txt
index 22d7ab6..20f3bdd 100644
--- a/grc/CMakeLists.txt
+++ b/grc/CMakeLists.txt
@@ -29,6 +29,14 @@ list(APPEND debug_blocks
 
 list(APPEND enabled_blocks
     satnogs_block_tree.xml
+    satnogs_ax25_decoder_bm.xml
+    satnogs_ax25_encoder_mb.xml
+    satnogs_ccsds_rs_decoder_mm.xml
+    satnogs_decoder_8b10b.xml
+    satnogs_fox_telem_mm.xml
+    satnogs_frame_file_sink.xml
+    satnogs_iq_sink.xml
+    satnogs_lrpt_sync.xml 
     satnogs_morse_decoder.xml
     satnogs_multi_format_msg_sink.xml
     satnogs_ogg_encoder.xml 
@@ -38,13 +46,10 @@ list(APPEND enabled_blocks
     satnogs_doppler_correction_cc.xml
     satnogs_udp_msg_sink.xml
     satnogs_coarse_doppler_correction_cc.xml
-    satnogs_ax25_encoder_mb.xml
-    satnogs_ax25_decoder_bm.xml
     satnogs_waterfall_sink.xml
+    satnogs_quad_demod_filter_ff.xml
     satnogs_ogg_source.xml
     satnogs_noaa_apt_sink.xml
-    satnogs_frame_file_sink.xml
-    satnogs_iq_sink.xml 
 )
 
 if(${INCLUDE_DEBUG_BLOCKS})
@@ -52,8 +57,5 @@ if(${INCLUDE_DEBUG_BLOCKS})
 endif()
 install(FILES
     ${enabled_blocks}
-    satnogs_quad_demod_filter_ff.xml
-    satnogs_decoder_8b10b.xml
-    satnogs_ccsds_rs_decoder_mm.xml
-    satnogs_fox_telem_mm.xml DESTINATION share/gnuradio/grc/blocks
+    DESTINATION share/gnuradio/grc/blocks
 )
diff --git a/grc/satnogs_block_tree.xml b/grc/satnogs_block_tree.xml
index ed471e7..c7d35e8 100644
--- a/grc/satnogs_block_tree.xml
+++ b/grc/satnogs_block_tree.xml
@@ -21,10 +21,11 @@
   <block>satnogs_cw_matched_filter_ff</block>
   <block>satnogs_morse_decoder</block>
   <block>satnogs_multi_format_msg_sink</block>
+  <block>satnogs_lrpt_sync</block>
+  <block>satnogs_iq_sink</block>
   <block>satnogs_ogg_encoder</block>
   <block>satnogs_ogg_source</block>
   <block>satnogs_cw_to_symbol</block>
-  <block>satnogs_sine_matched_filter_ff</block>
   <block>satnogs_udp_msg_source</block>
   <block>satnogs_tcp_rigctl_msg_source</block>
   <block>satnogs_doppler_correction_cc</block>
diff --git a/grc/satnogs_iq_sink.xml b/grc/satnogs_iq_sink.xml
index 853d1a4..3527995 100644
--- a/grc/satnogs_iq_sink.xml
+++ b/grc/satnogs_iq_sink.xml
@@ -2,7 +2,6 @@
 <block>
   <name>IQ Sink</name>
   <key>satnogs_iq_sink</key>
-  <category>[SatNOGS]</category>
   <import>import satnogs</import>
   <make>satnogs.iq_sink($scale, $filename, $append, $status)</make>
   <callback>open($file)</callback>
diff --git a/grc/satnogs_lrpt_sync.xml b/grc/satnogs_lrpt_sync.xml
new file mode 100644
index 0000000..60f22c0
--- /dev/null
+++ b/grc/satnogs_lrpt_sync.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0"?>
+<block>
+  <name>LRPT Frame Sync</name>
+  <key>satnogs_lrpt_sync</key>
+  <import>import satnogs</import>
+  <make>satnogs.lrpt_sync($thresh)</make>
+
+  <param>
+    <name>Threshold</name>
+    <key>thresh</key>
+    <value>2</value>
+    <type>int</type>
+  </param>
+
+  <sink>
+    <name>in</name>
+    <type>complex</type>
+  </sink>
+
+</block>
\ No newline at end of file
diff --git a/include/satnogs/CMakeLists.txt b/include/satnogs/CMakeLists.txt
index cf2b26f..f242e30 100644
--- a/include/satnogs/CMakeLists.txt
+++ b/include/satnogs/CMakeLists.txt
@@ -70,5 +70,6 @@ install(FILES
     quad_demod_filter_ff.h
     decoder_8b10b.h
     ccsds_rs_decoder_mm.h
-    fox_telem_mm.h DESTINATION include/satnogs
+    fox_telem_mm.h
+    lrpt_sync.h DESTINATION include/satnogs
 )
\ No newline at end of file
diff --git a/include/satnogs/lrpt_sync.h b/include/satnogs/lrpt_sync.h
new file mode 100644
index 0000000..5ca30bc
--- /dev/null
+++ b/include/satnogs/lrpt_sync.h
@@ -0,0 +1,715 @@
+/* -*- c++ -*- */
+/*                     GNU GENERAL PUBLIC LICENSE
+ *                        Version 3, 29 June 2007
+ * 
+ *  Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ *  Everyone is permitted to copy and distribute verbatim copies
+ *  of this license document, but changing it is not allowed.
+ * 
+ *                             Preamble
+ * 
+ *   The GNU General Public License is a free, copyleft license for
+ * software and other kinds of works.
+ * 
+ *   The licenses for most software and other practical works are designed
+ * to take away your freedom to share and change the works.  By contrast,
+ * the GNU General Public License is intended to guarantee your freedom to
+ * share and change all versions of a program--to make sure it remains free
+ * software for all its users.  We, the Free Software Foundation, use the
+ * GNU General Public License for most of our software; it applies also to
+ * any other work released this way by its authors.  You can apply it to
+ * your programs, too.
+ * 
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+ * copy of the Program in return for a fee.
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+ * 
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+ * possible use to the public, the best way to achieve this is to make it
+ * free software which everyone can redistribute and change under these terms.
+ * 
+ *   To do so, attach the following notices to the program.  It is safest
+ * to attach them to the start of each source file to most effectively
+ * state the exclusion of warranty; and each file should have at least
+ * the "copyright" line and a pointer to where the full notice is found.
+ * 
+ *     {one line to give the program's name and a brief idea of what it does.}
+ *     Copyright (C) {year}  {name of author}
+ * 
+ *     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, either 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 for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ * Also add information on how to contact you by electronic and paper mail.
+ * 
+ *   If the program does terminal interaction, make it output a short
+ * notice like this when it starts in an interactive mode:
+ * 
+ *     {project}  Copyright (C) {year}  {fullname}
+ *     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ *     This is free software, and you are welcome to redistribute it
+ *     under certain conditions; type `show c' for details.
+ * 
+ * The hypothetical commands `show w' and `show c' should show the appropriate
+ * parts of the General Public License.  Of course, your program's commands
+ * might be different; for a GUI interface, you would use an "about box".
+ * 
+ *   You should also get your employer (if you work as a programmer) or school,
+ * if any, to sign a "copyright disclaimer" for the program, if necessary.
+ * For more information on this, and how to apply and follow the GNU GPL, see
+ * <http://www.gnu.org/licenses/>.
+ * 
+ *   The GNU General Public License does not permit incorporating your program
+ * into proprietary programs.  If your program is a subroutine library, you
+ * may consider it more useful to permit linking proprietary applications with
+ * the library.  If this is what you want to do, use the GNU Lesser General
+ * Public License instead of this License.  But first, please read
+ * <http://www.gnu.org/philosophy/why-not-lgpl.html>.
+ */
+
+#ifndef INCLUDED_SATNOGS_LRPT_SYNC_H
+#define INCLUDED_SATNOGS_LRPT_SYNC_H
+
+#include <satnogs/api.h>
+#include <gnuradio/sync_block.h>
+
+namespace gr
+{
+namespace satnogs
+{
+
+/*!
+ * \brief <+description of block+>
+ * \ingroup satnogs
+ *
+ */
+class SATNOGS_API lrpt_sync : virtual public gr::sync_block
+{
+public:
+  typedef boost::shared_ptr<lrpt_sync> sptr;
+
+  /*!
+   * \brief Return a shared_ptr to a new instance of satnogs::lrpt_sync.
+   *
+   * To avoid accidental use of raw pointers, satnogs::lrpt_sync's
+   * constructor is in a private implementation
+   * class. satnogs::lrpt_sync::make is the public interface for
+   * creating new instances.
+   */
+  static sptr
+  make (size_t threshold = 2);
+};
+
+} // namespace satnogs
+} // namespace gr
+
+#endif /* INCLUDED_SATNOGS_LRPT_SYNC_H */
+
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 7661f73..755e2b1 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -69,7 +69,8 @@ list(APPEND satnogs_sources
     quad_demod_filter_ff_impl.cc
     decoder_8b10b_impl.cc
     ccsds_rs_decoder_mm_impl.cc
-    fox_telem_mm_impl.cc)
+    fox_telem_mm_impl.cc
+    lrpt_sync_impl.cc)
 
 if(${INCLUDE_DEBUG_BLOCKS})
 	list(APPEND satnogs_sources ${satnogs_debug_sources})
@@ -88,6 +89,8 @@ add_dependencies(gnuradio-satnogs fec)
 target_link_libraries(gnuradio-satnogs
     ${Boost_LIBRARIES}
     ${GNURADIO_ALL_LIBRARIES}
+    gnuradio-blocks
+    gnuradio-digital
     ${CMAKE_THREAD_LIBS_INIT}
     ${NOVA_LIBRARIES}
     ${VOLK_LIBRARIES}
diff --git a/lib/lrpt_sync_impl.cc b/lib/lrpt_sync_impl.cc
new file mode 100644
index 0000000..749340e
--- /dev/null
+++ b/lib/lrpt_sync_impl.cc
@@ -0,0 +1,183 @@
+/* -*- c++ -*- */
+/*
+ * gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
+ *
+ *  Copyright (C) 2018, Libre Space Foundation <http://librespacefoundation.org/>
+ *
+ *  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, either 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 for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include "lrpt_sync_impl.h"
+#include <satnogs/log.h>
+
+#include <volk/volk.h>
+#include <gnuradio/blocks/count_bits.h>
+
+namespace gr
+{
+namespace satnogs
+{
+
+lrpt_sync::sptr
+lrpt_sync::make (size_t threshold)
+{
+  return gnuradio::get_initial_sptr (new lrpt_sync_impl (threshold));
+}
+
+/*
+ * The private constructor
+ */
+lrpt_sync_impl::lrpt_sync_impl (size_t threshold) :
+        gr::sync_block ("lrpt_sync",
+                   gr::io_signature::make (1, 1, sizeof(gr_complex)),
+                   gr::io_signature::make (0, 0, 0)),
+                   d_thresh(threshold),
+                   d_asm_coded(0xd49c24ff2686b),
+                   d_asm_coded_len(52),
+                   d_asm_coded_mask((1ULL << d_asm_coded_len) - 1),
+                   /*
+                    * We process the data in a multiple of 2 frames and a UW
+                    * sync word
+                    */
+                   d_window((72 + 8)/2),
+                   d_frame_sync(false),
+                   d_rotate(1, 0),
+                   d_qpsk(digital::constellation_qpsk::make()),
+                   d_shift_reg0(0x0),
+                   d_shift_reg1(0x0),
+                   d_shift_reg2(0x0),
+                   d_shift_reg3(0x0)
+{
+
+  set_output_multiple(d_window);
+  const int alignment_multiple = volk_get_alignment () / sizeof(gr_complex);
+  set_alignment (std::max (1, alignment_multiple));
+  d_rotate_pi2 = (gr_complex *)volk_malloc(d_window, volk_get_alignment ());
+  if(!d_rotate_pi2) {
+    throw std::runtime_error("lrpt_sync: Could not allocate memory");
+  }
+
+  d_rotate_2pi2 = (gr_complex *)volk_malloc(d_window, volk_get_alignment ());
+  if(!d_rotate_2pi2) {
+    volk_free(d_rotate_pi2);
+    throw std::runtime_error("lrpt_sync: Could not allocate memory");
+  }
+
+  d_rotate_3pi2 = (gr_complex *)volk_malloc(d_window, volk_get_alignment ());
+  if(!d_rotate_3pi2) {
+    volk_free(d_rotate_pi2);
+    volk_free(d_rotate_2pi2);
+    throw std::runtime_error("lrpt_sync: Could not allocate memory");
+  }
+}
+
+/*
+ * Our virtual destructor.
+ */
+lrpt_sync_impl::~lrpt_sync_impl ()
+{
+  volk_free (d_rotate_pi2);
+  volk_free (d_rotate_2pi2);
+  volk_free (d_rotate_3pi2);
+}
+
+bool
+lrpt_sync_impl::found_sync(uint64_t reg)
+{
+  return blocks::count_bits64 ((reg ^ d_asm_coded) & d_asm_coded_mask)
+      <= d_thresh;
+}
+
+
+int
+lrpt_sync_impl::work_no_sync(const gr_complex *in, int noutput_items)
+{
+  uint32_t bits;
+  int multiple = noutput_items / d_window;
+  for(int i = 0; i < multiple; i++) {
+    volk_32fc_s32fc_multiply_32fc(d_rotate_pi2, in + i * d_window,
+                                  gr_complex(0, 1), d_window);
+    volk_32fc_s32fc_multiply_32fc(d_rotate_2pi2, in + i * d_window,
+                                  gr_complex(-1, 0), d_window);
+    volk_32fc_s32fc_multiply_32fc(d_rotate_3pi2, in + i * d_window,
+                                  gr_complex(0, -1), d_window);
+    /*
+     * Search for the sync pattern, rotating the QPSK constellation on
+     * all possible positions
+     */
+    for(int j = 0; j < d_window; j++) {
+      bits = d_qpsk->decision_maker(in + i * d_window + j);
+      d_shift_reg0 = (d_shift_reg0 << 2) | bits;
+      if(found_sync(d_shift_reg0)) {
+        d_rotate = gr_complex(1.0, 0);
+        d_frame_sync = true;
+        return i * d_window + j;
+      }
+
+      bits = d_qpsk->decision_maker(d_rotate_pi2 + j);
+      d_shift_reg1 = (d_shift_reg1 << 2) | bits;
+      if(found_sync(d_shift_reg1)) {
+        d_rotate = gr_complex(0.0, 1.0);
+        d_frame_sync = true;
+        return i * d_window + j;
+      }
+
+      bits = d_qpsk->decision_maker(d_rotate_2pi2 + j);
+      d_shift_reg2 = (d_shift_reg2 << 2) | bits;
+      if(found_sync(d_shift_reg2)) {
+        d_rotate = gr_complex(-1.0, 0);
+        d_frame_sync = true;
+        return i * d_window + j;
+      }
+
+      bits = d_qpsk->decision_maker(d_rotate_3pi2 + j);
+      d_shift_reg3 = (d_shift_reg3 << 2) | bits;
+      if(found_sync(d_shift_reg3)) {
+        d_rotate = gr_complex(0.0, -1.0);
+        d_frame_sync = true;
+        return i * d_window + j;
+      }
+    }
+  }
+  return noutput_items;
+}
+
+int
+lrpt_sync_impl::work_sync(const gr_complex *in, int noutput_items)
+{
+  return noutput_items;
+}
+
+
+int
+lrpt_sync_impl::work (int noutput_items,
+                      gr_vector_const_void_star &input_items,
+                      gr_vector_void_star &output_items)
+{
+  const gr_complex *in = (const gr_complex *) input_items[0];
+  uint32_t bits;
+  if(!d_frame_sync) {
+    return work_no_sync(in, noutput_items);
+  }
+  return work_sync(in, noutput_items);
+}
+
+} /* namespace satnogs */
+} /* namespace gr */
+
diff --git a/lib/lrpt_sync_impl.h b/lib/lrpt_sync_impl.h
new file mode 100644
index 0000000..60a5c55
--- /dev/null
+++ b/lib/lrpt_sync_impl.h
@@ -0,0 +1,733 @@
+/* -*- c++ -*- */
+/*                     GNU GENERAL PUBLIC LICENSE
+ *                        Version 3, 29 June 2007
+ * 
+ *  Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ *  Everyone is permitted to copy and distribute verbatim copies
+ *  of this license document, but changing it is not allowed.
+ * 
+ *                             Preamble
+ * 
+ *   The GNU General Public License is a free, copyleft license for
+ * software and other kinds of works.
+ * 
+ *   The licenses for most software and other practical works are designed
+ * to take away your freedom to share and change the works.  By contrast,
+ * the GNU General Public License is intended to guarantee your freedom to
+ * share and change all versions of a program--to make sure it remains free
+ * software for all its users.  We, the Free Software Foundation, use the
+ * GNU General Public License for most of our software; it applies also to
+ * any other work released this way by its authors.  You can apply it to
+ * your programs, too.
+ * 
+ *   When we speak of free software, we are referring to freedom, not
+ * price.  Our General Public Licenses are designed to make sure that you
+ * have the freedom to distribute copies of free software (and charge for
+ * them if you wish), that you receive source code or can get it if you
+ * want it, that you can change the software or use pieces of it in new
+ * free programs, and that you know you can do these things.
+ * 
+ *   To protect your rights, we need to prevent others from denying you
+ * these rights or asking you to surrender the rights.  Therefore, you have
+ * certain responsibilities if you distribute copies of the software, or if
+ * you modify it: responsibilities to respect the freedom of others.
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+ *   For example, if you distribute copies of such a program, whether
+ * gratis or for a fee, you must pass on to the recipients the same
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+ *   Developers that use the GNU GPL protect your rights with two steps:
+ * (1) assert copyright on the software, and (2) offer you this License
+ * giving you legal permission to copy, distribute and/or modify it.
+ * 
+ *   For the developers' and authors' protection, the GPL clearly explains
+ * that there is no warranty for this free software.  For both users' and
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+ *   Finally, every program is threatened constantly by software patents.
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+ * patents cannot be used to render the program non-free.
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+ *   The precise terms and conditions for copying, distribution and
+ * modification follow.
+ * 
+ *                        TERMS AND CONDITIONS
+ * 
+ *   0. Definitions.
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+ *   "This License" refers to version 3 of the GNU General Public License.
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+ *   "Copyright" also means copyright-like laws that apply to other kinds of
+ * works, such as semiconductor masks.
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+ *   "The Program" refers to any copyrightable work licensed under this
+ * License.  Each licensee is addressed as "you".  "Licensees" and
+ * "recipients" may be individuals or organizations.
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+ *   A "covered work" means either the unmodified Program or a work based
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+ *   You may convey verbatim copies of the Program's source code as you
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+ *   6. Conveying Non-Source Forms.
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+ *   You may convey a covered work in object code form under the terms
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+ *     a) Convey the object code in, or embodied in, a physical product
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+ *   A "User Product" is either (1) a "consumer product", which means any
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+ * documented (and with an implementation available to the public in
+ * source code form), and must require no special password or key for
+ * unpacking, reading or copying.
+ * 
+ *   7. Additional Terms.
+ * 
+ *   "Additional permissions" are terms that supplement the terms of this
+ * License by making exceptions from one or more of its conditions.
+ * Additional permissions that are applicable to the entire Program shall
+ * be treated as though they were included in this License, to the extent
+ * that they are valid under applicable law.  If additional permissions
+ * apply only to part of the Program, that part may be used separately
+ * under those permissions, but the entire Program remains governed by
+ * this License without regard to the additional permissions.
+ * 
+ *   When you convey a copy of a covered work, you may at your option
+ * remove any additional permissions from that copy, or from any part of
+ * it.  (Additional permissions may be written to require their own
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+ *   Notwithstanding any other provision of this License, for material you
+ * add to a covered work, you may (if authorized by the copyright holders of
+ * that material) supplement the terms of this License with terms:
+ * 
+ *     a) Disclaiming warranty or limiting liability differently from the
+ *     terms of sections 15 and 16 of this License; or
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+ * received it, or any part of it, contains a notice stating that it is
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+ * a further restriction but permits relicensing or conveying under this
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+ *   Additional terms, permissive or non-permissive, may be stated in the
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+ *   8. Termination.
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+ *   You may not propagate or modify a covered work except as expressly
+ * provided under this License.  Any attempt otherwise to propagate or
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+ * this License (including any patent licenses granted under the third
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+ *   However, if you cease all violation of this License, then your
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+ *   Termination of your rights under this section does not terminate the
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+ *   9. Acceptance Not Required for Having Copies.
+ * 
+ *   You are not required to accept this License in order to receive or
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+ * occurring solely as a consequence of using peer-to-peer transmission
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+ *   10. Automatic Licensing of Downstream Recipients.
+ * 
+ *   Each time you convey a covered work, the recipient automatically
+ * receives a license from the original licensors, to run, modify and
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+ *   An "entity transaction" is a transaction transferring control of an
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+ * (including a cross-claim or counterclaim in a lawsuit) alleging that
+ * any patent claim is infringed by making, using, selling, offering for
+ * sale, or importing the Program or any portion of it.
+ * 
+ *   11. Patents.
+ * 
+ *   A "contributor" is a copyright holder who authorizes use under this
+ * License of the Program or a work on which the Program is based.  The
+ * work thus licensed is called the contributor's "contributor version".
+ * 
+ *   A contributor's "essential patent claims" are all patent claims
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+ * hereafter acquired, that would be infringed by some manner, permitted
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+ * purposes of this definition, "control" includes the right to grant
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+ * 
+ *   Each contributor grants you a non-exclusive, worldwide, royalty-free
+ * patent license under the contributor's essential patent claims, to
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+ *   In the following three paragraphs, a "patent license" is any express
+ * agreement or commitment, however denominated, not to enforce a patent
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+ *   If you convey a covered work, knowingly relying on a patent license,
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+ * then you must either (1) cause the Corresponding Source to be so
+ * available, or (2) arrange to deprive yourself of the benefit of the
+ * patent license for this particular work, or (3) arrange, in a manner
+ * consistent with the requirements of this License, to extend the patent
+ * license to downstream recipients.  "Knowingly relying" means you have
+ * actual knowledge that, but for the patent license, your conveying the
+ * covered work in a country, or your recipient's use of the covered work
+ * in a country, would infringe one or more identifiable patents in that
+ * country that you have reason to believe are valid.
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+ *   If, pursuant to or in connection with a single transaction or
+ * arrangement, you convey, or propagate by procuring conveyance of, a
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+ * receiving the covered work authorizing them to use, propagate, modify
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+ * work and works based on it.
+ * 
+ *   A patent license is "discriminatory" if it does not include within
+ * the scope of its coverage, prohibits the exercise of, or is
+ * conditioned on the non-exercise of one or more of the rights that are
+ * specifically granted under this License.  You may not convey a covered
+ * work if you are a party to an arrangement with a third party that is
+ * in the business of distributing software, under which you make payment
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+ * parties who would receive the covered work from you, a discriminatory
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+ * conveyed by you (or copies made from those copies), or (b) primarily
+ * for and in connection with specific products or compilations that
+ * contain the covered work, unless you entered into that arrangement,
+ * or that patent license was granted, prior to 28 March 2007.
+ * 
+ *   Nothing in this License shall be construed as excluding or limiting
+ * any implied license or other defenses to infringement that may
+ * otherwise be available to you under applicable patent law.
+ * 
+ *   12. No Surrender of Others' Freedom.
+ * 
+ *   If conditions are imposed on you (whether by court order, agreement or
+ * otherwise) that contradict the conditions of this License, they do not
+ * excuse you from the conditions of this License.  If you cannot convey a
+ * covered work so as to satisfy simultaneously your obligations under this
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+ * not convey it at all.  For example, if you agree to terms that obligate you
+ * to collect a royalty for further conveying from those to whom you convey
+ * the Program, the only way you could satisfy both those terms and this
+ * License would be to refrain entirely from conveying the Program.
+ * 
+ *   13. Use with the GNU Affero General Public License.
+ * 
+ *   Notwithstanding any other provision of this License, you have
+ * permission to link or combine any covered work with a work licensed
+ * under version 3 of the GNU Affero General Public License into a single
+ * combined work, and to convey the resulting work.  The terms of this
+ * License will continue to apply to the part which is the covered work,
+ * but the special requirements of the GNU Affero General Public License,
+ * section 13, concerning interaction through a network will apply to the
+ * combination as such.
+ * 
+ *   14. Revised Versions of this License.
+ * 
+ *   The Free Software Foundation may publish revised and/or new versions of
+ * the GNU General Public License from time to time.  Such new versions will
+ * be similar in spirit to the present version, but may differ in detail to
+ * address new problems or concerns.
+ * 
+ *   Each version is given a distinguishing version number.  If the
+ * Program specifies that a certain numbered version of the GNU General
+ * Public License "or any later version" applies to it, you have the
+ * option of following the terms and conditions either of that numbered
+ * version or of any later version published by the Free Software
+ * Foundation.  If the Program does not specify a version number of the
+ * GNU General Public License, you may choose any version ever published
+ * by the Free Software Foundation.
+ * 
+ *   If the Program specifies that a proxy can decide which future
+ * versions of the GNU General Public License can be used, that proxy's
+ * public statement of acceptance of a version permanently authorizes you
+ * to choose that version for the Program.
+ * 
+ *   Later license versions may give you additional or different
+ * permissions.  However, no additional obligations are imposed on any
+ * author or copyright holder as a result of your choosing to follow a
+ * later version.
+ * 
+ *   15. Disclaimer of Warranty.
+ * 
+ *   THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+ * APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+ * HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+ * ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+ * 
+ *   16. Limitation of Liability.
+ * 
+ *   IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+ * WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+ * THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+ * GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+ * USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+ * DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+ * PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+ * EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGES.
+ * 
+ *   17. Interpretation of Sections 15 and 16.
+ * 
+ *   If the disclaimer of warranty and limitation of liability provided
+ * above cannot be given local legal effect according to their terms,
+ * reviewing courts shall apply local law that most closely approximates
+ * an absolute waiver of all civil liability in connection with the
+ * Program, unless a warranty or assumption of liability accompanies a
+ * copy of the Program in return for a fee.
+ * 
+ *                      END OF TERMS AND CONDITIONS
+ * 
+ *             How to Apply These Terms to Your New Programs
+ * 
+ *   If you develop a new program, and you want it to be of the greatest
+ * possible use to the public, the best way to achieve this is to make it
+ * free software which everyone can redistribute and change under these terms.
+ * 
+ *   To do so, attach the following notices to the program.  It is safest
+ * to attach them to the start of each source file to most effectively
+ * state the exclusion of warranty; and each file should have at least
+ * the "copyright" line and a pointer to where the full notice is found.
+ * 
+ *     {one line to give the program's name and a brief idea of what it does.}
+ *     Copyright (C) {year}  {name of author}
+ * 
+ *     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, either 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 for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ * Also add information on how to contact you by electronic and paper mail.
+ * 
+ *   If the program does terminal interaction, make it output a short
+ * notice like this when it starts in an interactive mode:
+ * 
+ *     {project}  Copyright (C) {year}  {fullname}
+ *     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ *     This is free software, and you are welcome to redistribute it
+ *     under certain conditions; type `show c' for details.
+ * 
+ * The hypothetical commands `show w' and `show c' should show the appropriate
+ * parts of the General Public License.  Of course, your program's commands
+ * might be different; for a GUI interface, you would use an "about box".
+ * 
+ *   You should also get your employer (if you work as a programmer) or school,
+ * if any, to sign a "copyright disclaimer" for the program, if necessary.
+ * For more information on this, and how to apply and follow the GNU GPL, see
+ * <http://www.gnu.org/licenses/>.
+ * 
+ *   The GNU General Public License does not permit incorporating your program
+ * into proprietary programs.  If your program is a subroutine library, you
+ * may consider it more useful to permit linking proprietary applications with
+ * the library.  If this is what you want to do, use the GNU Lesser General
+ * Public License instead of this License.  But first, please read
+ * <http://www.gnu.org/philosophy/why-not-lgpl.html>.
+ */
+
+#ifndef INCLUDED_SATNOGS_LRPT_SYNC_IMPL_H
+#define INCLUDED_SATNOGS_LRPT_SYNC_IMPL_H
+
+#include <satnogs/lrpt_sync.h>
+#include <gnuradio/digital/constellation.h>
+
+namespace gr
+{
+namespace satnogs
+{
+
+class lrpt_sync_impl : public lrpt_sync
+{
+public:
+  lrpt_sync_impl (size_t threshold);
+  ~lrpt_sync_impl ();
+
+  int
+  work (int noutput_items,
+        gr_vector_const_void_star &input_items,
+        gr_vector_void_star &output_items);
+
+private:
+  const size_t                          d_thresh;
+  const uint64_t                        d_asm_coded;
+  const uint64_t                        d_asm_coded_len;
+  const uint64_t                        d_asm_coded_mask;
+  const int                             d_window;
+  bool                                  d_frame_sync;
+  gr_complex                            d_rotate;
+  digital::constellation_qpsk::sptr     d_qpsk;
+  uint64_t                              d_shift_reg0;
+  uint64_t                              d_shift_reg1;
+  uint64_t                              d_shift_reg2;
+  uint64_t                              d_shift_reg3;
+  gr_complex*                           d_rotate_pi2;
+  gr_complex*                           d_rotate_2pi2;
+  gr_complex*                           d_rotate_3pi2;
+
+  int
+  work_no_sync(const gr_complex *in, int noutput_items);
+
+  int
+  work_sync(const gr_complex *in, int noutput_items);
+
+  bool
+  found_sync(uint64_t reg);
+
+};
+
+
+} // namespace satnogs
+} // namespace gr
+
+#endif /* INCLUDED_SATNOGS_LRPT_SYNC_IMPL_H */
+
diff --git a/swig/satnogs_swig0.i b/swig/satnogs_swig0.i
index 90af799..2ac09ba 100644
--- a/swig/satnogs_swig0.i
+++ b/swig/satnogs_swig0.i
@@ -35,6 +35,7 @@
 #include "satnogs/decoder_8b10b.h"
 #include "satnogs/ccsds_rs_decoder_mm.h"
 #include "satnogs/fox_telem_mm.h"
+#include "satnogs/lrpt_sync.h"
 %}
 
 
@@ -113,3 +114,6 @@ GR_SWIG_BLOCK_MAGIC2(satnogs, ccsds_rs_decoder_mm);
 
 %include "satnogs/fox_telem_mm.h"
 GR_SWIG_BLOCK_MAGIC2(satnogs, fox_telem_mm);
+
+%include "satnogs/lrpt_sync.h"
+GR_SWIG_BLOCK_MAGIC2(satnogs, lrpt_sync);