On Fri, 2 Apr 2010 23:19:24 -0400 solarwind wrote: > It lists a "maximum bandwidth" column. What does "maximum bandwidth" > mean? With modulation modes proliferating (all those digital modes were too many to keep track of), FCC and, I suppose regulatory agencies of Canada and many other countries opted to specify maximum bandwidth allowed in certain frequency segments. So, in the more restricted shortwave bands you'll find 2.5 or 3 kHz as max bandwidth (typical SSB), while in higher bands wider modulation techniques are permitted. Note that appart from just the maximum bandwidth there still may be restrictions on the actual modes. And there is a restriction on the contents of the data transmitted, which much be compatible with the amateur charter. (and the data may not be transmitted encripted, except with publicly decodeable algorithms) John -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist