Video from Finland explains the VOA Radiogram concept (better than I can)
Greg, OH2FFY, in Finland (yes, the name doesn’t seem Finnish; he’s from Australia) produced this video about VOA Radiogram back on December 31, 2014, but I just discovered it today. Greg does an excellent job of explaining the VOA Radiogram concept, in words and pictures…
https://www.youtube.com/watch?v=mEXbQ8W-gqc