diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index 02161340c..e81160575 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -62,7 +62,6 @@ set (UG_SRCS
 
 set (UG_IMGS
   images/130610_2343-wav-80.png
-  images/170709_135615.wav.png
   images/AstroData_2.png
   images/Astronomical_data.png
   images/auto-seq.png
@@ -79,6 +78,7 @@ set (UG_IMGS
   images/FreqCal_Results.png
   images/freemsg.png
   images/ft8_decodes.png
+  images/FT8_waterfall.png
   images/help-menu.png
   images/JT4F.png
   images/JT65B.png
diff --git a/doc/user_guide/en/images/MSK144.png b/doc/user_guide/en/images/MSK144.png
index 2109c8cda..adc28f98e 100644
Binary files a/doc/user_guide/en/images/MSK144.png and b/doc/user_guide/en/images/MSK144.png differ
diff --git a/doc/user_guide/en/images/ft8_decodes.png b/doc/user_guide/en/images/ft8_decodes.png
index 2b5b4e959..dd4a8f3d1 100644
Binary files a/doc/user_guide/en/images/ft8_decodes.png and b/doc/user_guide/en/images/ft8_decodes.png differ
diff --git a/doc/user_guide/en/tutorial-example3.adoc b/doc/user_guide/en/tutorial-example3.adoc
index 6e4e98c56..e8e37c715 100644
--- a/doc/user_guide/en/tutorial-example3.adoc
+++ b/doc/user_guide/en/tutorial-example3.adoc
@@ -1,7 +1,7 @@
 // Status=review
 .Main Window:
 - Select *FT8* on the *Mode* menu.
-- Set Tx and Rx frequencies to 1200 Hz.
+- Set Tx frequency to 1600 Hz, Rx to 1442 Hz.
 - Double-click on *Erase* to clear both text windows.
 
 .Wide Graph Settings:
@@ -13,11 +13,13 @@ frequency limit is approximately 2600 Hz.
 .Open a Wave File:
 
 - Select *File | Open* and navigate to
-+...\save\samples\FT8\170709_135615.wav+.  The waterfall and decoded
-text window should look something like the following screen shots:
++...\save\samples\FT8\181201_180245.wav+.  The waterfall and Band
+Activity window should look something like the following screen shots.
+(This recording was made during the "FT8 Roundup" contest, so most
+transmissions happen to be using *RTTY Roundup* message formats.)
 
 [[X15]]
-image::170709_135615.wav.png[align="left",alt="Wide Graph Decode 170709_135615"]
+image::FT8_waterfall.png[align="left",alt="Wide Graph Decode 170709_135615"]
 
 image::ft8_decodes.png[align="left"]
 
@@ -37,9 +39,9 @@ things just described and also invokes the decoder in a small range
 around the Rx frequency.  To decode a particular signal, double-click
 near the left edge of its waterfall trace.
 
-- Now double-click on any of the the lines of decoded text in the main
-window.  All three lines will show the same behavior, setting Rx
-frequency to that of the selected message and leaving Tx frequency
+- Now double-click on any of the the lines of decoded text in the Band
+Activity window.  Any line will show the same behavior, setting
+Rx frequency to that of the selected message and leaving Tx frequency
 unchanged.  To change both Rx and Tx frequencies, hold *Ctrl* down
 when double-clicking.
 
diff --git a/doc/user_guide/en/vhf-features.adoc b/doc/user_guide/en/vhf-features.adoc
index 1838529ce..41aade4c0 100644
--- a/doc/user_guide/en/vhf-features.adoc
+++ b/doc/user_guide/en/vhf-features.adoc
@@ -241,10 +241,8 @@ up to about 2100 km (1300 miles).  Completing a QSO takes longer in
 the evening than in the morning, longer at higher frequencies, and
 longer at distances close to the upper limit.  But with patience, 100
 Watts or more, and a single yagi it can usually be done.  The
-following screen shot shows two 15-second MSK144 transmissions from
-W5ADD during a 50 MHz QSO with K1JT, at a distance of about 1800 km
-(1100 mi).  The decoded segments have been marked on the *Fast
-Graph* spectral display.
+following screen shot shows two 15-second reception intervals
+containing MSK144 signals from three different stations.
 
 image::MSK144.png[align="center",alt="MSK144"]
 
diff --git a/samples/FT8/170709_135615.wav b/samples/FT8/170709_135615.wav
deleted file mode 100644
index a3ebf8836..000000000
Binary files a/samples/FT8/170709_135615.wav and /dev/null differ
diff --git a/samples/FT8/181201_180245.wav b/samples/FT8/181201_180245.wav
new file mode 100644
index 000000000..e62d9dc4a
Binary files /dev/null and b/samples/FT8/181201_180245.wav differ
diff --git a/samples/MSK144/160915_113100.wav b/samples/MSK144/160915_113100.wav
deleted file mode 100644
index 295f11d6e..000000000
Binary files a/samples/MSK144/160915_113100.wav and /dev/null differ
diff --git a/samples/MSK144/160915_113230.wav b/samples/MSK144/160915_113230.wav
deleted file mode 100644
index f1337a709..000000000
Binary files a/samples/MSK144/160915_113230.wav and /dev/null differ
diff --git a/samples/MSK144/181211_120500.wav b/samples/MSK144/181211_120500.wav
new file mode 100644
index 000000000..dc0601632
Binary files /dev/null and b/samples/MSK144/181211_120500.wav differ
diff --git a/samples/MSK144/181211_120800.wav b/samples/MSK144/181211_120800.wav
new file mode 100644
index 000000000..a353e70a1
Binary files /dev/null and b/samples/MSK144/181211_120800.wav differ