Dave if this is a reply to my comment. Go and re-read it again . At 11:24 PM 6/21/2006, you wrote: >I have an SCS PTC-IIe that can operate both Pactor-2 and Pactor-3. I >can find no evidence of a busy frequency detector in its >documentation or schematic. > >For keyboard-to-keyboard Pactor operation, there is no need of busy >frequency detection; the operators at each end can assure a clear >frequency just as they would do with any other attended QSO. > >Neither Pactor nor SCS modems are the problem. Semi-automatic >operation without busy frequency detection will be a source of QRM >no matter what protocol is used. > >There is plenty of email traffic on the published WinLink PMBO >frequencies; see http://users.iafrica.com/z/zs/zs5s/bulls/PMBO.TXT > >
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