Leigh, Within the automatic sub bands, they would not have to have any detection and would still be legal. When the rules were drawn up, the technology had not been invented to have busy frequency detection, at least not for amateur radio. But that all changed a couple years ago when Rick, KN6KB invented the technique.
When they are outside the automatic sub bands, it is my view that they must take great care to insure that the automatic station is not transmitting over other stations. The one good thing is that the wider Pactor 3 mode can not be used automatically when outside the automatic area. However, the P2 mode (500 Hz or less) can be used anywhere in the text data portions of the bands when sending text data. One thing that has come to my attention is that Winlink 2000 claims to be handling FAX transmission for weather. Does anyone know if this is really true? It would definitely not be legal to do this with Pactor 3 in the text data area under the current rules here in the U.S.. It only recently became legal here on the narrow (500 Hz and less) to send analog or digital FAX in the text data portions of the bands. 73, Rick, KV9U Leigh L Klotz, Jr. wrote: > Well, then it's true. They don't care about the law. > Leigh/WA5ZNU > On Sat, 24 Mar 2007 5:49 pm, kv9u wrote: > >> The discussion of automatic signal detection and not transmitting on a >> busy frequency has been a major item of discussion in the past day on >> one of the Winlink 2000 groups and the impression that I got from the >> main spokesperson/owner was that if they had to follow busy detection >> rules, Winlink 2000 would be impossible to operate. >> >>
