 // handle multiple nodes; in that case we'd have a way to do
 // production test and qualification. However, using an RWC5020A
 // is a much better use of development time.
-        const static uint8_t kChannel = 1;
+        const static uint8_t kChannel = 0;
         uint32_t uBandwidth;
 
         LMIC.freq = AS923_F1 + kChannel * 200000;

        else
                LMIC.datarate = AS923_DR_SF7B;        // DR8

        // default tx power for US: 21 dBm
        LMIC.txpow = 16;
#else
# error Unsupported LMIC regional configuration.
#endif


  // default tx power for US: 21 dBm
  LMIC.txpow = 21;
#elif defined(CFG_au921)
  // make it easier for test, by pull the parameters up to the top of the
  // block. Ideally, we'd use the serial port to drive this; or have
  // a voting protocol where one side is elected the controller and
  // guides the responder through all the channels, powers, ramps
  // the transmit power from min to max, and measures the RSSI and SNR.
  // Even more amazing would be a scheme where the controller could
  // handle multiple nodes; in that case we'd have a way to do
  // production test and qualification. However, using an RWC5020A
  // is a much better use of development time.

  // set fDownlink true to use a downlink channel; false
  // to use an uplink channel. Generally speaking, uplink
  // is more interesting, because you can prove that gateways
  // *should* be able to hear you.
  const static bool fDownlink = false;

  // the downlink channel to be used.
  const static uint8_t kDownlinkChannel = 3;

  // the uplink channel to be used.
  const static uint8_t kUplinkChannel = 8 + 3;

  // this is automatically set to the proper bandwidth in kHz,
  // based on the selected channel.
  uint32_t uBandwidth;

  if (! fDownlink)
	{
	if (kUplinkChannel < 64)
		{
		LMIC.freq = AU921_125kHz_UPFBASE +
			    kUplinkChannel * AU921_125kHz_UPFSTEP;
		uBandwidth = 125;
		}
	else
		{
		LMIC.freq = AU921_500kHz_UPFBASE +
			    (kUplinkChannel - 64) * AU921_500kHz_UPFSTEP;
		uBandwidth = 500;
		}
	}
  else
	{
	// downlink channel
	LMIC.freq = AU921_500kHz_DNFBASE +
		    kDownlinkChannel * AU921_500kHz_DNFSTEP;
	uBandwidth = 500;
	}

  // Use a suitable spreading factor
  if (uBandwidth < 500)
        LMIC.datarate = AU921_DR_SF7;         // DR4
  else
        LMIC.datarate = AU921_DR_SF12CR;      // DR8

  // default tx power for AU: 30 dBm
  LMIC.txpow = 30;
#elif defined(CFG_as923)
// make it easier for test, by pull the parameters up to the top of the
// block. Ideally, we'd use the serial port to drive this; or have
