Jim, Yes, MT3 at 500Hz bandwidth may have an occupied bandwidth greater than 500 Hz. My spectrum analyzer has a hard time with bandwidths less than 500 Hz. I used to not have that problem with it, but I have changed something. I will have to check. I went through the resolution bandwidth and video bandwidth, but that did not help. The problem is that when I measure the occupied 26 db down, the bandwidth of a single tone it is 384 Hz. That used to not be the case. Maybe my delta 44 sound card is not as clean as I would have hoped.
73, Mark N5RFX At 11:56 AM 11/19/2006, you wrote: >Bonnie, > >Why can't you use bandwidths of 500 or less in Olivia or MT63 to send >images in the narrow subbands? My copy of gMFSK allows setting >parameters of both protocols to values that should meet the >requirements of the new FCC rules. I recognize MT63 may not have an >occupied bandwidth of 500 Hz at its lowest setting, but I haven't >researched that totally. > >Jim >WA0LYK
