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diff --git a/src/output/UHD.h b/src/output/UHD.h
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+/*
+   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Her Majesty the
+   Queen in Right of Canada (Communications Research Center Canada)
+
+   Copyright (C) 2017
+   Matthias P. Braendli, matthias.braendli@mpb.li
+
+    http://opendigitalradio.org
+
+DESCRIPTION:
+   It is an output driver for the USRP family of devices, and uses the UHD
+   library.
+*/
+
+/*
+   This file is part of ODR-DabMod.
+
+   ODR-DabMod 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.
+
+   ODR-DabMod 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 ODR-DabMod.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#ifdef HAVE_CONFIG_H
+#   include <config.h>
+#endif
+
+#ifdef HAVE_OUTPUT_UHD
+
+#include <uhd/utils/thread_priority.hpp>
+#include <uhd/utils/safe_main.hpp>
+#include <uhd/usrp/multi_usrp.hpp>
+#include <chrono>
+#include <memory>
+#include <string>
+#include <atomic>
+
+#include "Log.h"
+#include "output/SDR.h"
+#include "output/USRPTime.h"
+#include "TimestampDecoder.h"
+#include "RemoteControl.h"
+#include "ThreadsafeQueue.h"
+
+#include <stdio.h>
+#include <sys/types.h>
+
+// If the timestamp is further in the future than
+// 100 seconds, abort
+#define TIMESTAMP_ABORT_FUTURE 100
+
+// Add a delay to increase buffers when
+// frames are too far in the future
+#define TIMESTAMP_MARGIN_FUTURE 0.5
+
+namespace Output {
+
+class UHD : public Output::SDRDevice
+{
+    public:
+        UHD(SDRDeviceConfig& config);
+        UHD(const UHD& other) = delete;
+        UHD& operator=(const UHD& other) = delete;
+        ~UHD();
+
+        virtual void tune(double lo_offset, double frequency) override;
+        virtual double get_tx_freq(void) override;
+        virtual void set_txgain(double txgain) override;
+        virtual double get_txgain(void) override;
+        virtual void transmit_frame(const struct FrameData& frame) override;
+        virtual RunStatistics get_run_statistics(void) override;
+        virtual double get_real_secs(void) override;
+
+        virtual void set_rxgain(double rxgain) override;
+        virtual double get_rxgain(void) override;
+        virtual size_t receive_frame(
+                complexf *buf,
+                size_t num_samples,
+                struct frame_timestamp& ts,
+                double timeout_secs) override;
+
+        // Return true if GPS and reference clock inputs are ok
+        virtual bool is_clk_source_ok(void) override;
+        virtual const char* device_name(void) override;
+
+    private:
+        SDRDeviceConfig& m_conf;
+        uhd::usrp::multi_usrp::sptr m_usrp;
+        uhd::tx_streamer::sptr m_tx_stream;
+        uhd::rx_streamer::sptr m_rx_stream;
+        std::shared_ptr<USRPTime> m_device_time;
+
+        size_t num_underflows = 0;
+        size_t num_overflows = 0;
+        size_t num_late_packets = 0;
+        size_t num_frames_modulated = 0; //TODO increment
+        size_t num_underflows_previous = 0;
+        size_t num_late_packets_previous = 0;
+
+        uhd::tx_metadata_t md;
+
+        // Used to print statistics once a second
+        std::chrono::steady_clock::time_point last_print_time;
+
+        // Returns true if we want to verify loss of refclk
+        bool refclk_loss_needs_check(void) const;
+        bool suppress_refclk_loss_check = false;
+
+        // Poll asynchronous metadata from UHD
+        std::atomic<bool> m_running;
+        boost::thread m_async_rx_thread;
+        void stop_threads(void);
+        void print_async_thread(void);
+};
+
+} // namespace Output
+
+#endif // HAVE_OUTPUT_UHD
+