This note will briefly discuss the possible frequency allocations we may use.

Justifications for selection of frequencies

 (text from Roger Birkelands thesis)

ITU regulations

From ITU Radio Regulation Articles

Possible frequency allocations

The following is from the relevant sections of ITU Radio Regulations. The allocations are similar for the three regions, except for some national/regional differences. Also, PRIMARY (indicated by CAPS) and secondary (indicated by lowercase) allocations are slightly different. 

Notes (both for ITU Region 1 and ITU Region 2)

Most important:

https://www.itu.int/dms_pubrec/itu-r/rec/rs/R-REC-RS.1260-2-201709-I!!PDF-E.pdf

Region 1

Region 2