diff --git a/gr-jay/grc/jay_frequency_tuner.xml b/gr-jay/grc/jay_frequency_tuner.xml
new file mode 100644
index 0000000..8fe2e15
--- /dev/null
+++ b/gr-jay/grc/jay_frequency_tuner.xml
@@ -0,0 +1,34 @@
+
+
+ frequency_tuner
+ jay_frequency_tuner
+ [jay]
+ import jay
+ jay.frequency_tuner($freq_min, $freq_max, $freq_step)
+
+ Frequency Min
+ freq_min
+ 0
+ float
+
+
+ Frequency Max
+ freq_max
+ 0
+ float
+
+
+ Frequency Step
+ freq_step
+ 0
+ float
+
+
+ in
+ complex
+
+
+ out
+ complex
+
+
diff --git a/gr-jay/include/jay/frequency_tuner.h b/gr-jay/include/jay/frequency_tuner.h
new file mode 100644
index 0000000..f5a3e15
--- /dev/null
+++ b/gr-jay/include/jay/frequency_tuner.h
@@ -0,0 +1,56 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2019 Jay Arrowfield.
+ *
+ * This 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, or (at your option)
+ * any later version.
+ *
+ * This software 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 software; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+
+#ifndef INCLUDED_JAY_FREQUENCY_TUNER_H
+#define INCLUDED_JAY_FREQUENCY_TUNER_H
+
+#include
+#include
+
+namespace gr {
+ namespace jay {
+
+ /*!
+ * \brief <+description of block+>
+ * \ingroup jay
+ *
+ */
+ class JAY_API frequency_tuner : virtual public gr::block
+ {
+ public:
+ typedef boost::shared_ptr sptr;
+
+ /*!
+ * \brief Return a shared_ptr to a new instance of jay::frequency_tuner.
+ *
+ * To avoid accidental use of raw pointers, jay::frequency_tuner's
+ * constructor is in a private implementation
+ * class. jay::frequency_tuner::make is the public interface for
+ * creating new instances.
+ */
+ static sptr make(float freq_min, float freq_max, float freq_step);
+ };
+
+ } // namespace jay
+} // namespace gr
+
+#endif /* INCLUDED_JAY_FREQUENCY_TUNER_H */
+
diff --git a/gr-jay/lib/frequency_tuner_impl.cc b/gr-jay/lib/frequency_tuner_impl.cc
new file mode 100644
index 0000000..6c41806
--- /dev/null
+++ b/gr-jay/lib/frequency_tuner_impl.cc
@@ -0,0 +1,81 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2019 Jay Arrowfield.
+ *
+ * This 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, or (at your option)
+ * any later version.
+ *
+ * This software 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 software; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include
+#include "frequency_tuner_impl.h"
+
+namespace gr {
+ namespace jay {
+
+ frequency_tuner::sptr
+ frequency_tuner::make(float freq_min, float freq_max, float freq_step)
+ {
+ return gnuradio::get_initial_sptr
+ (new frequency_tuner_impl(freq_min, freq_max, freq_step));
+ }
+
+ /*
+ * The private constructor
+ */
+ frequency_tuner_impl::frequency_tuner_impl(float freq_min, float freq_max, float freq_step)
+ : gr::block("frequency_tuner", gr::io_signature::make(1, 1, sizeof(gr_complex)), gr::io_signature::make(1, 1, sizeof(gr_complex)))
+ , m_freq_min(freq_min)
+ , m_freq_max(freq_max)
+ , m_freq_step(freq_step)
+ {}
+
+ /*
+ * Our virtual destructor.
+ */
+ frequency_tuner_impl::~frequency_tuner_impl()
+ {
+ }
+
+ void
+ frequency_tuner_impl::forecast (int noutput_items, gr_vector_int &ninput_items_required)
+ {
+ ninput_items_required[0] = noutput_items;
+ }
+
+ int
+ frequency_tuner_impl::general_work (int noutput_items,
+ gr_vector_int &ninput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items)
+ {
+ const gr_complex *in = (const gr_complex *) input_items[0];
+ gr_complex *out = (gr_complex *) output_items[0];
+
+ // Do <+signal processing+>
+ // Tell runtime system how many input items we consumed on
+ // each input stream.
+ consume_each (noutput_items);
+
+ // Tell runtime system how many output items we produced.
+ return noutput_items;
+ }
+
+ } /* namespace jay */
+} /* namespace gr */
+
diff --git a/gr-jay/lib/frequency_tuner_impl.h b/gr-jay/lib/frequency_tuner_impl.h
new file mode 100644
index 0000000..55ce273
--- /dev/null
+++ b/gr-jay/lib/frequency_tuner_impl.h
@@ -0,0 +1,53 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2019 Jay Arrowfield.
+ *
+ * This 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, or (at your option)
+ * any later version.
+ *
+ * This software 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 software; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_JAY_FREQUENCY_TUNER_IMPL_H
+#define INCLUDED_JAY_FREQUENCY_TUNER_IMPL_H
+
+#include
+
+namespace gr {
+ namespace jay {
+
+ class frequency_tuner_impl : public frequency_tuner
+ {
+ private:
+ // Nothing to declare in this block.
+ float m_freq_min;
+ float m_freq_max;
+ float m_freq_step;
+ public:
+ frequency_tuner_impl(float freq_min, float freq_max, float freq_step);
+ ~frequency_tuner_impl();
+
+ // Where all the action really happens
+ void forecast (int noutput_items, gr_vector_int &ninput_items_required);
+
+ int general_work(int noutput_items,
+ gr_vector_int &ninput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items);
+ };
+
+ } // namespace jay
+} // namespace gr
+
+#endif /* INCLUDED_JAY_FREQUENCY_TUNER_IMPL_H */
+