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diff --git a/lib/transmitter/txtime_setter_impl.h b/lib/transmitter/txtime_setter_impl.h
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+++ b/lib/transmitter/txtime_setter_impl.h
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+/* -*- c++ -*- */
+/* @file
+ * @author Piotr Krysik <ptrkrysik@gmail.com>
+ * @section LICENSE
+ * 
+ * Gr-gsm 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.
+ * 
+ * Gr-gsm 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 gr-gsm; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ * 
+ */
+
+#ifndef INCLUDED_GSM_TXTIME_SETTER_IMPL_H
+#define INCLUDED_GSM_TXTIME_SETTER_IMPL_H
+
+#include <grgsm/transmitter/txtime_setter.h>
+#include <grgsm/misc_utils/time_spec.h>
+#include <grgsm/misc_utils/fn_time.h>
+
+namespace gr {
+  namespace gsm {
+
+    class txtime_setter_impl : public txtime_setter
+    {
+     private:
+      uint32_t d_fn_ref;
+      uint32_t d_ts_ref;
+      time_format d_time_ref;
+      time_format d_time_hint;
+      double d_timing_advance;
+      double d_delay_correction;
+
+      void process_fn_time_reference(pmt::pmt_t msg);
+      void process_txtime_of_burst(pmt::pmt_t msg);
+
+     public:
+      txtime_setter_impl(uint32_t init_fn, uint64_t init_time_secs,
+        double init_time_fracs, uint64_t time_hint_secs,
+        double time_hint_fracs, double timing_advance,
+        double delay_correction);
+      ~txtime_setter_impl();
+
+      // Where all the action really happens
+      void set_fn_time_reference(uint32_t fn, uint32_t ts,
+        uint64_t time_secs, double time_fracs);
+      void set_time_hint(uint64_t time_hint_secs, double time_hint_fracs);
+      void set_delay_correction(double delay_correction);
+      void set_timing_advance(double timing_advance);
+    };
+
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_TXTIME_SETTER_IMPL_H */