Update readme.txt

spreadsheet/readme.txt

@@ -1,10 +1,8 @@
-This spreadsheet is for analyzing the CubeSat Simulator telemetry.
+This spreadsheet is for analyzing the CubeSatSim APRS and CW telemetry ONLY.
 
-This is only used for the AFSK 1200 APRS telemetry mode.  The latest version of the CubeSatSim supports Fox-1 telemetry emulation, so the use of this mode is encouraged - it does not use this spreadsheet as the telemetry is automatically decoded and graphed.
+The best telemetry for the CubeSatSim is FSK which uses the AMSAT FoxTelem software to automatically demodulate, decode, and graph the data.
 
-Setting up FoxTelem is described here https://github.com/alanbjohnston/CubeSatSim/wiki/Ground-Station
+For more information see https://github.com/alanbjohnston/CubeSatSim/wiki/3.-Ground-Station
-
-This spreadsheet has been tested with Office 365 (Windows) and Office Excel for Mac (Version: 16.16.6) and LibreOffice Calc Version: 6.1.4.2 (Windows)
 
 A version for Google Docs is available for copying and download at:
 
@@ -12,12 +10,12 @@ A version for Google Docs is available for copying and download at:
 
 Instructions:
 
-Copy your raw telemetry data into the Data Input tab.  If you don't have any data, copy data from the Sample Data tab.
+Copy your raw telemetry data into the Data Input tab.  If you don't have any data, copy data from the Sample Data tab.  
 
-The odd rows should be a time timestamp (which is ignored) while the even rows should contain frames of telemetry data (beginning with "hi hi" then a series of 3 digit numbers).  If this isn't the case, you will need to edit until even lines starting at row 2 contain frames of telemetry.
+The odd rows can be a callsign or time timestamp (which is ignored) while the even rows should contain frames of telemetry data (beginning with "hi hi" then a series of 3 digit numbers).  If this isn't the case, you will need to edit until even lines starting at row 2 contain frames of telemetry.
 
 The telemetry starting in Row 2 will be automatically calculated and plotted.
 
 See plots in Voltage Graphs, Current Graphs, and Temperature Graph tabs.
 
-To see raw data or create a new plot, go to Graphs tab
+To see raw data or create a new plot, go to Graphs tab.