Index: dev_comm/excitation.txt
===================================================================
--- dev_comm/excitation.txt	(revision 23564)
+++ dev_comm/excitation.txt	(revision 23565)
@@ -1,13 +1,16 @@
 
-There are 5 kinds of excitation but for a first release lets only do Gaussian
-excitation.
+Gaussian excitation
 
 It has 2 inputs we care about. They are frequencies the manual calls f0 and
 fc.
 
-f0 is the center frequency
-fc is the 20db cutoff frequency
+   center frequency
+f0=_____________Hz
 
+    20db cutoff frequency
+fc=_____________Hz (bandwidth = 2*fc)
+
+
 technically there is another variable but lets assume we aren't trying to
 support every mode of operation and just assume users who need it will have to
 do some programming of their own. So just regurgitate the FDTD in the output
@@ -15,5 +18,23 @@
 format:
 FDTD = SetGaussExcite(FDTD,f0,fc);
 
+**
 
+Sinusoidal excitation
 
+     sinewave frequency
+f0 = ______Hz
+
+FDTD = SetSinusExcite(FDTD,f0)
+
+**
+
+
+
+   nyquest rate
+f0=________ Hz
+
+
+
+FDTD = SetCustomExcite(FDTD,f0,funcStr)
+