Well P. Smith ... Maybe my terminology of "available" vs "occupied" transponder bandwidth wasn't the best choice, but it still seems like we are talking about the same thing here. If the total "available" bandwidth of a tp. like on the Spaceways when operated in their "non-processor" or "Bent-Pipe" mode is 62.5 Mhz, but only 36 Mhz of that is used by the spectrum of a 36M0G7W type transmission relayed by it. Then about 26.5 MHz (+/- 13.25 MHz on either edge for a frequency centered signal) of the transponder's available bandwidth is not being used. Or is "unoccupied." And a signal with a 36 MHz wide spectra centered on the tp. center frequency is what should register on a spectrum analyzer.