diff --git a/repeater/src/lib/repeater.i b/repeater/src/lib/repeater.i
index f764821..f788019 100644
--- a/repeater/src/lib/repeater.i
+++ b/repeater/src/lib/repeater.i
@@ -163,13 +163,13 @@ private:
 
 // ----------------------------------------------------------------
 GR_SWIG_BLOCK_MAGIC(repeater,chan_usrp_rx);
-repeater_chan_usrp_rx_sptr repeater_make_chan_usrp_rx (const char* udp_host, int port, int debug);
+repeater_chan_usrp_rx_sptr repeater_make_chan_usrp_rx (const char* udp_host, int port, int debug, int input_size);
 
 class repeater_chan_usrp_rx : public gr_block
 {
 private:
 
-  repeater_chan_usrp_rx (const char* udp_host, int port, int debug);  	// private constructor
+  repeater_chan_usrp_rx (const char* udp_host, int port, int debug, int input_size);  	// private constructor
 
 public:
   void unkey(void);
diff --git a/repeater/src/lib/repeater_chan_usrp_rx.cc b/repeater/src/lib/repeater_chan_usrp_rx.cc
index be83401..02775ba 100644
--- a/repeater/src/lib/repeater_chan_usrp_rx.cc
+++ b/repeater/src/lib/repeater_chan_usrp_rx.cc
@@ -19,10 +19,11 @@
  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 02111-1307, USA.
  *
+ * This file is part of OP25
+ * repeater_chan_usrp_rx Copyright 2010-2013 KA1RBI
+ *
  */
 
-static const int phase_table[4] = {+1, +3, -1, -3};
-
 /*
  * config.h is generated by configure.  It contains the results
  * of probing for features, options etc.  It should be the first
@@ -54,29 +55,39 @@ static const int phase_table[4] = {+1, +3, -1, -3};
 #define min(a,b) ((a<b)?a:b)
 #endif
 
+static const int phase_table[4] = {+1, +3, -1, -3};
+static const int COMPLEX_FRAME_SIZE = 96 * sizeof(gr_complex);	// 4800 * 0.02
+
 /*
  * Create a new instance of repeater_chan_usrp_rx and return
  * a boost shared_ptr.  This is effectively the public constructor.
  */
 repeater_chan_usrp_rx_sptr 
-repeater_make_chan_usrp_rx (const char* udp_host, int port, int debug)
+repeater_make_chan_usrp_rx (const char* udp_host, int port, int debug, int input_size)
 {
-  return repeater_chan_usrp_rx_sptr (new repeater_chan_usrp_rx(udp_host, port, debug));
+  return repeater_chan_usrp_rx_sptr (new repeater_chan_usrp_rx(udp_host, port, debug, input_size));
 }
 
 /*
  * The private constructor
  */
-repeater_chan_usrp_rx::repeater_chan_usrp_rx (const char* udp_host, int port, int debug)
+repeater_chan_usrp_rx::repeater_chan_usrp_rx (const char* udp_host, int port, int debug, int input_size)
   : gr_block ("chan_usrp_rx",
-		   gr_make_io_signature (1, 1, sizeof(short)),
+		   gr_make_io_signature (1, 1, input_size),
 		   gr_make_io_signature (0, 0, 0)),
 	d_udp_host(udp_host),
 	d_port(port),
 	d_debug(debug),
 	d_sampbuf_ct(0),
-	d_sendseq(0)
+	d_sendseq(0),
+	d_input_size(input_size),
+	d_buf_data_size ((input_size == sizeof(gr_complex)) ? COMPLEX_FRAME_SIZE : USRP_VOICE_FRAME_SIZE),
+	d_max_sampbuf_ct(d_buf_data_size / d_input_size)
 {
+	assert(input_size == sizeof(int16_t) || input_size == sizeof(gr_complex));
+
+	write_buf = new char[sizeof(struct _chan_usrp_bufhdr) + d_buf_data_size];
+
 	init_sock(udp_host, port);
 }
 
@@ -84,6 +95,8 @@ repeater_chan_usrp_rx::~repeater_chan_usrp_rx ()
 {
 	if (write_sock > 0)
 		close(write_sock);
+
+	delete [] write_buf;
 }
 
 static int sends, samps;
@@ -95,8 +108,13 @@ repeater_chan_usrp_rx::general_work (int noutput_items,
                                gr_vector_void_star &output_items)
 {
 	struct timeval tv;
+
 	const int16_t *in = (const int16_t *) input_items[0];
 	int16_t *sampbuf = (int16_t *) &write_buf[sizeof(struct _chan_usrp_bufhdr)];
+
+	const gr_complex *in_c = (const gr_complex *) input_items[0];
+	gr_complex *sampbuf_c = (gr_complex *) &write_buf[sizeof(struct _chan_usrp_bufhdr)];
+
 	struct _chan_usrp_bufhdr *bufhdrp = (struct _chan_usrp_bufhdr*) write_buf;
 	gettimeofday(&tv, NULL);
 //	fprintf(stderr, "sec %lu usec %lu output %d\n", tv.tv_sec, tv.tv_usec, noutput_items);
@@ -104,16 +122,19 @@ repeater_chan_usrp_rx::general_work (int noutput_items,
 	int consumed = 0;
 
 	for (int i = 0; i < noutput_items; i++) {
-		int16_t samp = in[i];
-		sampbuf[d_sampbuf_ct++] = samp;
+		if (d_input_size == sizeof(gr_complex)) {
+			sampbuf_c[d_sampbuf_ct++] = in_c[i];
+		} else {
+			sampbuf[d_sampbuf_ct++] = in[i];
+		}
 		consumed++;
-		if (d_sampbuf_ct >= (USRP_VOICE_FRAME_SIZE>>1)) {
+		if (d_sampbuf_ct >= d_max_sampbuf_ct) {
 			d_sampbuf_ct = 0;
 			memset(bufhdrp, 0, sizeof(struct _chan_usrp_bufhdr));
 			memcpy(bufhdrp->eye, "USRP", 4);
 			bufhdrp->seq = htonl(d_sendseq++);
 			bufhdrp->keyup = htonl(1);
-			int rc = sendto(write_sock, write_buf, sizeof(struct _chan_usrp_bufhdr) + USRP_VOICE_FRAME_SIZE, 0, (struct sockaddr *)&write_sock_addr, sizeof(write_sock_addr));
+			int rc = sendto(write_sock, write_buf, sizeof(struct _chan_usrp_bufhdr) + d_buf_data_size, 0, (struct sockaddr *)&write_sock_addr, sizeof(write_sock_addr));
 //			gettimeofday(&tv, NULL);
 //			fprintf(stderr, "rc %d sends %d samps %u sec %lu usec %lu\n", rc, sends++, samps, tv.tv_sec, tv.tv_usec);
 			break;
diff --git a/repeater/src/lib/repeater_chan_usrp_rx.h b/repeater/src/lib/repeater_chan_usrp_rx.h
index 0391766..ca95ed1 100644
--- a/repeater/src/lib/repeater_chan_usrp_rx.h
+++ b/repeater/src/lib/repeater_chan_usrp_rx.h
@@ -57,7 +57,7 @@ typedef std::deque<uint8_t> dibit_queue;
  * constructor is private.  repeater_make_chan_usrp_rx is the public
  * interface for creating new instances.
  */
-repeater_chan_usrp_rx_sptr repeater_make_chan_usrp_rx (const char* udp_host, int port, int debug);
+repeater_chan_usrp_rx_sptr repeater_make_chan_usrp_rx (const char* udp_host, int port, int debug, int input_size);
 
 class repeater_chan_usrp_rx : public gr_block
 {
@@ -67,9 +67,9 @@ private:
 
   void init_sock(const char* udp_host, int udp_port);
 
-  friend repeater_chan_usrp_rx_sptr repeater_make_chan_usrp_rx (const char* udp_host, int port, int debug);
+  friend repeater_chan_usrp_rx_sptr repeater_make_chan_usrp_rx (const char* udp_host, int port, int debug, int input_size);
 
-  repeater_chan_usrp_rx (const char* udp_host, int port, int debug);
+  repeater_chan_usrp_rx (const char* udp_host, int port, int debug, int input_size);
   // internal functions
 
   // internal data
@@ -83,7 +83,12 @@ private:
   unsigned int d_sampbuf_ct;
   unsigned int d_sendseq;
 
-  char write_buf[ sizeof(struct _chan_usrp_bufhdr) + USRP_VOICE_FRAME_SIZE*sizeof(int16_t) ];
+//  char write_buf[ sizeof(struct _chan_usrp_bufhdr) + USRP_VOICE_FRAME_SIZE*sizeof(int16_t) ];
+  char *write_buf;
+
+  int d_input_size;
+  int d_buf_data_size;
+  unsigned int d_max_sampbuf_ct;
 
  public:
   ~repeater_chan_usrp_rx ();	// public destructor