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diff --git a/Transceiver52M/DummyLoad.h b/Transceiver52M/DummyLoad.h
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+/*
+* Copyright 2008 Free Software Foundation, Inc.
+*
+* This software is distributed under the terms of the GNU Public License.
+* See the COPYING file in the main directory for details.
+*
+* This use of this software may be subject to additional restrictions.
+* See the LEGAL file in the main directory for details.
+
+    This program 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.
+
+    This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "radioDevice.h"
+
+
+#include <sys/time.h>
+#include <math.h>
+#include <string>
+#include <iostream>
+
+
+/** A class to handle a USRP rev 4, with a two RFX900 daughterboards */
+class DummyLoad: public RadioDevice {
+
+private:
+
+  double sampleRate; 	///< the desired sampling rate
+  unsigned long long samplesRead;	///< number of samples read from USRP
+  unsigned long long samplesWritten;	///< number of samples sent to USRP
+
+  Mutex underrunLock;
+
+  struct timeval startTime, currTime; 
+
+  TIMESTAMP currstamp;
+  short *dummyBurst;
+  int dummyBurstSz;
+  int dummyBurstCursor;
+  bool underrun;
+
+  void updateTime(void);
+
+ public:
+
+  /** Object constructor */
+  DummyLoad (double _desiredSampleRate);
+
+  int loadBurst(short *wDummyBurst, int len);
+
+  /** Instantiate the USRP */
+  bool make(bool skipRx = false); 
+
+  /** Start the USRP */
+  bool start();
+
+  /** Stop the USRP */
+  bool stop();
+
+  /**
+	Read samples from the USRP.
+	@param buf preallocated buf to contain read result
+	@param len number of samples desired
+	@param overrun Set if read buffer has been overrun, e.g. data not being read fast enough
+	@param timestamp The timestamp of the first samples to be read
+	@param underrun Set if USRP does not have data to transmit, e.g. data not being sent fast enough
+	@param RSSI The received signal strength of the read result
+	@return The number of samples actually read
+  */
+  int  readSamples(short *buf, int len, bool *overrun, 
+		   TIMESTAMP timestamp = 0xffffffff,
+		   bool *underrun = NULL,
+		   unsigned *RSSI = NULL);
+  /**
+        Write samples to the USRP.
+        @param buf Contains the data to be written.
+        @param len number of samples to write.
+        @param underrun Set if USRP does not have data to transmit, e.g. data not being sent fast enough
+        @param timestamp The timestamp of the first sample of the data buffer.
+        @param isControl Set if data is a control packet, e.g. a ping command
+        @return The number of samples actually written
+  */
+  int  writeSamples(short *buf, int len, bool *underrun, 
+		    TIMESTAMP timestamp = 0xffffffff,
+		    bool isControl = false);
+ 
+  /** Update the alignment between the read and write timestamps */
+  bool updateAlignment(TIMESTAMP timestamp);
+  
+  /** Set the transmitter frequency */
+  bool setTxFreq(double wFreq);
+
+  /** Set the receiver frequency */
+  bool setRxFreq(double wFreq);
+
+  /** Returns the starting write Timestamp*/
+  TIMESTAMP initialWriteTimestamp(void) { return 20000;}
+
+  /** Returns the starting read Timestamp*/
+  TIMESTAMP initialReadTimestamp(void) { return 20000;}
+
+  /** returns the full-scale transmit amplitude **/
+  double fullScaleInputValue() {return 13500.0;}
+
+  /** returns the full-scale receive amplitude **/
+  double fullScaleOutputValue() {return 9450.0;}
+
+  /** Return internal status values */
+  inline double getTxFreq() { return 0;}
+  inline double getRxFreq() { return 0;}
+  inline double getSampleRate() {return sampleRate;}
+  inline double numberRead() { return samplesRead; }
+  inline double numberWritten() { return samplesWritten;}
+
+};
+