These are some sample spectra collected on 20m during the RTTY roundup. They were recorded with a Softrock Ensemble II, a Presonus Firestudio Mobile (for A/D) and SDR# for the display. The resolution bandwidth is about 6Hz in all pictures. This was received on a low dipole in upstate NY.
All of the signals I am showing have a SNR ratio of around 50-80dB, and register roughly S9 to S9+30dB on my K3, which should give you a rough idea for how loud they are. All of the plots have 10dB/div on the vertial axis, and the noise floor is approximately at the -80dB mark unless otherwise noted. The horizontal divisions are either 700Hz/div or 600Hz/div. It is a small difference, but take that into account when you compare the spectra. There is a frequency axis on the bottom to allow you to compare apples to apples. All of these signals do not have any noticable spurs in view, and other signals sticking out of the spectrum can be explained by other RTTY stations in close proximity.
This page simply illustrates that there is a significant difference between the occupied bandwidth of different signals in the contest--some are very neighbor friendly, some less so. Each signal is numbered for any discussion.
Signals #1 and #2 are the same strength, which makes for a good side-by-side comparison. You may need to scroll to the right to see signal #2, as it is a large picture. (600Hz/div)
Signal #6 is another big one, a little louder than #5 (700Hz/div)
