diff --git a/grc/m17_m17_coder.block.yml b/grc/m17_m17_coder.block.yml
index 07cf20e..b132fed 100644
--- a/grc/m17_m17_coder.block.yml
+++ b/grc/m17_m17_coder.block.yml
@@ -3,10 +3,6 @@ label: m17_coder
 category: '[m17]'
 
 parameters:
-- id: samp_rate
-  label: samp_rate
-  dtype: float
-  default: samp_rate
 - id: src_id
   label: Source ID
   dtype: string
@@ -33,10 +29,9 @@ asserts:
     - ${ type < 65536 }
 templates:
   imports: from gnuradio import m17
-  make: m17.m17_coder(${src_id},${dst_id},${type},${meta},${samp_rate},${debug})
+  make: m17.m17_coder(${src_id},${dst_id},${type},${meta},${debug})
   callbacks:
     - set_meta(${meta})
-    - set_samp_rate(${samp_rate})
     - set_src_id(${src_id})
     - set_dst_id(${dst_id})
     - set_type(${type})
@@ -64,7 +59,7 @@ outputs:
   optional: 0
 
 documentation: |-
-     The m17-coder block reads a byte datastream clocked (samp_rate) at 200 bits/s and will output a real stream at 24 times this input rate. The source and destination fields are 6-character strings, the type field is a 0-255 value and the meta field a free string which can be updated during transmission.
+     The m17-coder block reads a byte datastream clocked at 200 bits/s and outputs a real stream at 24 times this input rate (4800 Hz). The source and destination fields are 9-character callsign strings, the type field is a 0-65535 value and the meta field a free string which can be updated during transmission.
 
 #  'file_format' specifies the version of the GRC yml format used in the file
 #  and should usually not be changed.
diff --git a/include/gnuradio/m17/m17_coder.h b/include/gnuradio/m17/m17_coder.h
index 0bce81b..512fae2 100644
--- a/include/gnuradio/m17/m17_coder.h
+++ b/include/gnuradio/m17/m17_coder.h
@@ -32,11 +32,10 @@ public:
      * class. m17::m17_coder::make is the public interface for
      * creating new instances.
      */
-    static sptr make(std::string src_id,std::string dst_id,short type,std::string meta,float samp_rate,bool debug);
+    static sptr make(std::string src_id,std::string dst_id,short type,std::string meta,bool debug);
     virtual void set_meta(std::string meta)=0;
     virtual void set_src_id(std::string src_id)=0;
     virtual void set_dst_id(std::string dst_id)=0;
-    virtual void set_samp_rate(float samp_rate)=0;
     virtual void set_debug(bool debug)=0;
     virtual void set_type(short type)=0;
 };
diff --git a/lib/m17_coder_impl.cc b/lib/m17_coder_impl.cc
index 8aefa10..75090d1 100644
--- a/lib/m17_coder_impl.cc
+++ b/lib/m17_coder_impl.cc
@@ -46,13 +46,12 @@ struct LSF
 	uint8_t crc[2];
 } lsf;
 
-void send_Preamble(const uint8_t type,float *out, int *counterout, float samp_rate)
+void send_Preamble(const uint8_t type,float *out, int *counterout)
 {
     float symb;
 
     if(type) //pre-BERT
     {
-        // for(uint16_t i=0; i<(int)(40e-3*samp_rate)/2; i++) //40ms * 4800 = 192 TODO JMF
         for(uint16_t i=0; i<(int)(192/2); i++) //40ms * 4800 = 192
         {
             symb=-3.0;
@@ -67,7 +66,6 @@ void send_Preamble(const uint8_t type,float *out, int *counterout, float samp_ra
     }
     else //pre-LSF
     {
-        // for(uint16_t i=0; i<(int)(40e-3*samp_rate)/2; i++) //40ms * 4800 = 192 TODO JMF
         for(uint16_t i=0; i<(int)(192/2); i++) //40ms * 4800 = 192
         {
             symb=+3.0;
@@ -261,24 +259,23 @@ uint16_t LSF_CRC(struct LSF *in)
 }
 
     m17_coder::sptr
-    m17_coder::make(std::string src_id,std::string dst_id,short type,std::string meta, float samp_rate,bool debug)
+    m17_coder::make(std::string src_id,std::string dst_id,short type,std::string meta, bool debug)
     {
       return gnuradio::get_initial_sptr
-        (new m17_coder_impl(src_id,dst_id,type,meta,samp_rate,debug));
+        (new m17_coder_impl(src_id,dst_id,type,meta,debug));
     }
 
     /*
      * The private constructor
      */
-    m17_coder_impl::m17_coder_impl(std::string src_id,std::string dst_id,short type,std::string meta, float samp_rate, bool debug)
+    m17_coder_impl::m17_coder_impl(std::string src_id,std::string dst_id,short type,std::string meta, bool debug)
       : gr::block("m17_coder",
               gr::io_signature::make(1, 1, sizeof(char)),
               gr::io_signature::make(1, 1, sizeof(float)))
-              ,_samp_rate(samp_rate), _meta(meta),_type(type), _debug(debug)
+              , _meta(meta),_type(type), _debug(debug)
 {    set_meta(meta);
      set_src_id(src_id);
      set_dst_id(dst_id);
-     set_samp_rate(samp_rate);
      set_type(type);
      set_debug(debug);
      uint16_t ccrc=LSF_CRC(&lsf);
@@ -288,11 +285,6 @@ uint16_t LSF_CRC(struct LSF *in)
      _fn=0;                      //16-bit Frame Number (for the stream mode)
 }
 
-void m17_coder_impl::set_samp_rate(float samp_rate)
-{_samp_rate=samp_rate;
- printf("New sampling rate: %f\n",_samp_rate); 
-}
-
 void m17_coder_impl::set_debug(bool debug)
 {_debug=debug;
  if (_debug==true) printf("true\n"); else printf("Debug false\n"); 
@@ -540,7 +532,7 @@ printf("got_lsf=1\n");
             conv_Encode_LSF(enc_bits, &lsf);
 
             //send out the preamble and LSF
-            send_Preamble(0,out,&countout,_samp_rate); //0 - LSF preamble, as opposed to 1 - BERT preamble
+            send_Preamble(0,out,&countout); //0 - LSF preamble, as opposed to 1 - BERT preamble
 
             //send LSF syncword
             send_Syncword(SYNC_LSF,out,&countout);
diff --git a/lib/m17_coder_impl.h b/lib/m17_coder_impl.h
index 5fdbe8a..78e1925 100644
--- a/lib/m17_coder_impl.h
+++ b/lib/m17_coder_impl.h
@@ -18,7 +18,6 @@ class m17_coder_impl : public m17_coder
 private:
     std::string _meta;
     unsigned char _src_id[6],_dst_id[6];
-    float _samp_rate=0.;
     short _type;
     int _got_lsf=0;
     uint16_t _fn=0;                      //16-bit Frame Number (for the stream mode)
@@ -28,11 +27,10 @@ private:
 public:
     void set_src_id(std::string src_id);
     void set_dst_id(std::string dst_id);
-    void set_samp_rate(float samp_rate);
     void set_meta(std::string meta);
     void set_type(short type);
     void set_debug(bool debug);
-    m17_coder_impl(std::string src_id,std::string dst_id,short type,std::string meta,float samp_rate,bool debug);
+    m17_coder_impl(std::string src_id,std::string dst_id,short type,std::string meta,bool debug);
     ~m17_coder_impl();
 
     // Where all the action really happens
diff --git a/python/m17/bindings/docstrings/m17_coder_pydoc_template.h b/python/m17/bindings/docstrings/m17_coder_pydoc_template.h
index 469e1da..4dc83fe 100644
--- a/python/m17/bindings/docstrings/m17_coder_pydoc_template.h
+++ b/python/m17/bindings/docstrings/m17_coder_pydoc_template.h
@@ -28,8 +28,6 @@ static const char *__doc_gr_m17_m17_coder_set_src_id = R"doc()doc";
 
 static const char *__doc_gr_m17_m17_coder_set_dst_id = R"doc()doc";
 
-static const char *__doc_gr_m17_m17_coder_set_samp_rate = R"doc()doc";
-
 static const char *__doc_gr_m17_m17_coder_set_debug = R"doc()doc";
 
 static const char *__doc_gr_m17_m17_coder_set_type = R"doc()doc";
diff --git a/python/m17/bindings/m17_coder_python.cc b/python/m17/bindings/m17_coder_python.cc
index dddf08f..b257561 100644
--- a/python/m17/bindings/m17_coder_python.cc
+++ b/python/m17/bindings/m17_coder_python.cc
@@ -16,7 +16,7 @@
 /* BINDTOOL_GEN_AUTOMATIC(0) */
 /* BINDTOOL_USE_PYGCCXML(0) */
 /* BINDTOOL_HEADER_FILE(m17_coder.h)                                        */
-/* BINDTOOL_HEADER_FILE_HASH(c37cf1a142598d1cf96b7a93c85559f2) */
+/* BINDTOOL_HEADER_FILE_HASH(178a26e09118551324bf48782db38a1b) */
 /***********************************************************************************/
 
 #include <pybind11/complex.h>
@@ -37,8 +37,8 @@ void bind_m17_coder(py::module &m) {
       m, "m17_coder", D(m17_coder))
 
       .def(py::init(&m17_coder::make), py::arg("src_id"), py::arg("dst_id"),
-           py::arg("type"), py::arg("meta"), py::arg("samp_rate"),
-           py::arg("debug"), D(m17_coder, make))
+           py::arg("type"), py::arg("meta"), py::arg("debug"),
+           D(m17_coder, make))
 
       .def("set_meta", &m17_coder::set_meta, py::arg("meta"),
            D(m17_coder, set_meta))
@@ -49,9 +49,6 @@ void bind_m17_coder(py::module &m) {
       .def("set_dst_id", &m17_coder::set_dst_id, py::arg("dst_id"),
            D(m17_coder, set_dst_id))
 
-      .def("set_samp_rate", &m17_coder::set_samp_rate, py::arg("samp_rate"),
-           D(m17_coder, set_samp_rate))
-
       .def("set_debug", &m17_coder::set_debug, py::arg("debug"),
            D(m17_coder, set_debug))