https://www.rttycontesting.com/
Excellent tutorials for getting started on RTTY and setting up contesting software. Host of 2Tone software.
http://www.frontiernet.net/~aflowers/tinyfsk/
http://www.frontiernet.net/~aflowers/tinyfsk/TinyFSK.ino
Details and source code for the TinyFSK
http://www.hamntwoeggs.com/2018/03/programming-tinyfsk-with-arduino-ide.html
Programming the Arduino Nano with the TinyFSK software
http://www.hamntwoeggs.com/2018/03/tinyfsk-fsk-implementation-in-n1mm-and.html
TinyFSK Implementation with Writelog and N1MM+
http://www.hamntwoeggs.com/2018/04/tinyfsk-and-winwarbler.html
TinyFSK Implementation in WinWarbler
https://www.itu.int/dms_pubrec/itu-r/rec/sm/R-REC-SM.328-11-200605-I!!PDF-E.pdf
ITU Standard regarding RTTY Spectra and Bandwidth
http://www.w7ay.net/site/Technical/RTTY%20Sidebands/sidebands.html
Some information regarding RTTY sidebands, from Kok Chen W7AY
http://ncjweb.com/features/sepoct13feat.pdf
RTTY Spectrum Measurement, Andy Flowers, K0SM
Can RTTY transmit bandwidth be improved?
http://www.qsl.net/ja7ude/extfsk/jitter.html
JA7UDE analysis of jitter in RTTY transmissions with EXTFSK and EXTFSK64
FSK RTTY on the 7300 using a single USB cable and VSPE Com port splitter
