Small update to docs.

m17/images/test/m17-cxx-demod

@@ -1 +0,0 @@
-Subproject commit 0bf152e99098e2c2b70c1cc9dc5bfaccad2a2ead

m17/m17-configuration.ipynb

@@ -269,9 +269,10 @@
     "Stop transmitting. If the results look good after changing the polarity, go\n",
     "back to the main menu and press *Save Settings*.\n",
     "\n",
-    "If the results are still bad, stop check all of the frequency settings.  Verify\n",
-    "the PPM settings on the RTL-SDR.  Ensure that your radio's VCO is properly\n",
-    "calibrated and that it is transmitting and receiving at the proper frequency.\n",
+    "If the results are still bad, check the frequency settings used on the radio and\n",
+    "on the command-line for `rtl_fm`.  Verify the PPM settings on the RTL-SDR.  Ensure\n",
+    "that your radio's VCO is properly calibrated and that it is transmitting and\n",
+    "receiving at the proper frequency.\n",
     "\n",
     "You can also reach out to #public-chat on the M17 Discord for help.\n",
     "\n",
@@ -317,10 +318,11 @@
     "This is the same command used for BER testing and setting up the TX polarity,\n",
     "except we are now piping the output to the computer's audio output.\n",
     "\n",
-    "Press the transmit button on the M17 HT app.  A short press locks the transmit\n",
+    "Press the transmit button on the M17 HT app. The Transmit button can act\n",
+    "like a toggle button or a push button. A short press locks the transmit\n",
     "button.  Another short press disengages the transmit button.  If instead you\n",
-    "hold the button for longer than 1/2 second, it will stop transmitting as soon\n",
-    "as you release the button.\n",
+    "hold the button for longer than 1/2 second, it acts as a push button and will\n",
+    "stop transmitting as soon as you release the button.\n",
     "\n",
     "Press the transmit button, speak, then release the transmit button.  It is\n",
     "likely that you will hear a long delay before the received audio plays.  This\n",
@@ -335,7 +337,7 @@
     "  </tr>\n",
     "</table>\n",
     "\n",
-    "Notice that the callsign was decoded.\n",
+    "Notice that the callsign you entered into the M17 HT app was decoded.\n",
     "\n",
     "The long audio delay can be reduced somewhat by using `stdbuf`.  This makes the\n",
     "command-line a bit unwieldy.\n",
@@ -350,11 +352,11 @@
     "verify that the output polarity is correct first by attempting to\n",
     "receive it using the method outline in [Configure TX Polarity](#Configure-TX-Polarity).\n",
     "\n",
-    "Set up your Pluto SDR or other transmit-capable SDR.  Install any required\n",
+    "Set up your ADALM Pluto or other transmit-capable SDR.  Install any required\n",
     "filters and transmit antenna.  If you can, connect the SDR to the radio\n",
-    "under test through a 30dB or 40dB attenuator.  Be very careful if you do\n",
+    "under test through a 30dB or 40dB attenuator.  *Be very careful if you do\n",
     "connect the SDR to the radio because it is very easy to damage the SDR\n",
-    "if the radio transmits.\n",
+    "if the radio transmits.*\n",
     "\n",
     "Open *GNU Radio Companion* (GRC) and within that, open the `m17-bert.grc` file.\n",
     "Adjust the output sink paramters (including the frequency) for the test.  You\n",
@@ -385,6 +387,7 @@
     "    the Android device.  Open the Mobilinkd Config app. Connect to the TNC.\n",
     "    Select *Modem Settings*, then enable `RX Reverse Polarity`. Press *Close*\n",
     "    and then *Save Settings*.  Repeat the experiment.\n",
+    " 1. Try reducing the attenuation in the *PlutoSDR Sink* block.\n",
     "\n",
     "### Voice Reception\n",
     "\n",