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diff --git a/gnuradio-core/src/lib/general/gr_vco.h b/gnuradio-core/src/lib/general/gr_vco.h
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+++ b/gnuradio-core/src/lib/general/gr_vco.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2005 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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 2, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+#ifndef _GR_VCO_H_
+#define _GR_VCO_H_
+
+
+#include <vector>
+#include <gr_sincos.h>
+#include <cmath>
+#include <gr_complex.h>
+
+/*!
+ * \brief base class template for Voltage Controlled Oscillator (VCO)
+ */
+
+//FIXME  Eventually generalize this to fixed point
+
+template<class o_type, class i_type> 
+class gr_vco {
+public:
+  gr_vco () : d_phase (0) {}
+
+  virtual ~gr_vco () {}
+
+  // radians
+  void set_phase (double angle) {
+    d_phase = angle;
+  }
+
+  void adjust_phase (double delta_phase) {
+    d_phase += delta_phase;
+    if (fabs (d_phase) > M_PI){
+      
+      while (d_phase > M_PI)
+	d_phase -= 2*M_PI;
+
+      while (d_phase < -M_PI)
+	d_phase += 2*M_PI;
+    }
+  }
+
+  double get_phase () const { return d_phase; }
+
+  // compute sin and cos for current phase angle
+  void sincos (float *sinx, float *cosx) const;
+
+  // compute cos or sin for current phase angle
+  float cos () const { return std::cos (d_phase); }
+  float sin () const { return std::sin (d_phase); }
+
+  // compute a block at a time
+  void cos (float *output, const float *input, int noutput_items, double k, double ampl = 1.0);
+
+protected:
+  double d_phase;
+};
+
+template<class o_type, class i_type> 
+void
+gr_vco<o_type,i_type>::sincos (float *sinx, float *cosx) const
+{
+  gr_sincosf (d_phase, sinx, cosx);
+}
+
+template<class o_type, class i_type> 
+void
+gr_vco<o_type,i_type>::cos (float *output, const float *input, int noutput_items, double k, double ampl)
+{
+  for (int i = 0; i < noutput_items; i++){
+    output[i] = cos() * ampl;
+    adjust_phase(input[i] * k);
+  }
+}
+#endif /* _GR_VCO_H_ */