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diff --git a/Transceiver52M/device/uhd/smpl_buf.h b/Transceiver52M/device/uhd/smpl_buf.h
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+/*
+ * Sample Buffer - Allows reading and writing of timed samples
+ *
+ * Copyright 2010,2011 Free Software Foundation, Inc.
+ * Copyright (C) 2015 Ettus Research LLC
+ * Copyright 2019 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ *
+ * Author: Tom Tsou <tom.tsou@ettus.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * See the COPYING file in the main directory for details.
+ */
+
+#pragma once
+
+#include <unistd.h>
+#include <uhd/types/time_spec.hpp>
+
+#include "radioDevice.h"
+
+/*
+    Sample Buffer - Allows reading and writing of timed samples using osmo-trx
+                    or UHD style timestamps. Time conversions are handled
+                    internally or accessable through the static convert calls.
+*/
+class smpl_buf {
+public:
+	/** Sample buffer constructor
+	    @param len number of 32-bit samples the buffer should hold
+	    @param rate sample clockrate
+	    @param timestamp
+	*/
+	smpl_buf(size_t len, double rate);
+	~smpl_buf();
+
+	/** Query number of samples available for reading
+	    @param timestamp time of first sample
+	    @return number of available samples or error
+	*/
+	ssize_t avail_smpls(TIMESTAMP timestamp) const;
+	ssize_t avail_smpls(uhd::time_spec_t timestamp) const;
+
+	/** Read and write
+	    @param buf pointer to buffer
+	    @param len number of samples desired to read or write
+	    @param timestamp time of first stample
+	    @return number of actual samples read or written or error
+	*/
+	ssize_t read(void *buf, size_t len, TIMESTAMP timestamp);
+	ssize_t read(void *buf, size_t len, uhd::time_spec_t timestamp);
+	ssize_t write(void *buf, size_t len, TIMESTAMP timestamp);
+	ssize_t write(void *buf, size_t len, uhd::time_spec_t timestamp);
+
+	/** Buffer status string
+	    @return a formatted string describing internal buffer state
+	*/
+	std::string str_status(size_t ts) const;
+
+	/** Formatted error string
+	    @param code an error code
+	    @return a formatted error string
+	*/
+	static std::string str_code(ssize_t code);
+
+	enum err_code {
+		ERROR_TIMESTAMP = -1,
+		ERROR_READ = -2,
+		ERROR_WRITE = -3,
+		ERROR_OVERFLOW = -4
+	};
+
+private:
+	uint32_t *data;
+	size_t buf_len;
+
+	double clk_rt;
+
+	TIMESTAMP time_start;
+	TIMESTAMP time_end;
+
+	size_t data_start;
+	size_t data_end;
+};