Within PC-ALE there is a setting called "Voice Detect", I had not checked that box. I can confirm that with that box checked PC-ALE never transmitted when scanning 550, 740 and 860 KHZ.
I then modified my settings to scan frequencies with lower signal levels, 7120, 10000, and 14300. PC-ALE transmitted on 7120 , no signal present, but did not transmit on WWV's freq or on 14300. I need to play around more but it seems so far that PC-ALE does NOT transmit if the frequency is busy. How Charles accomplished this but the Winlink 2000 folks did not, is puzzling to me. If the frequency sounds clear but actually is not (perhaps one end of a QSO is not audible but the other will be when it is there turn) , what would be the difference between someone on SSB saying "is this frequency in use ?" and an ALE sounding? They both last about the same time. If one uses PSK31 or something like Olivia , sending "is this frequency in use?" would actually take longer than an ALE sounding. I can't join the "channelizing" debate because I don;t quite get it, but the early results are that PC-ALE does not transmit if a signal is present. I think I will next test 14070 14075 and see if PC-ALE detects PSK31 and other digital modes and avoids transmitting. Andy K3UK Fredonia, New York. Skype Me : callto://andyobrien73 Also available via Echolink Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
