> Andrew O'Brien wrote: > 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.
The most critical difference between a SSB or AM or CW or FM op calling "QRZ the Frequency?" or the like -- hearing nothing they go ahead and transmit -- is that they generally unkey their mike and engage their ears so if they weren't heard or didn't hear they will quickly hear someone advise them of a busy freq. Can PC-ALE compensate for a first-pass bad read on a busy frequency or does it then shift gears and pound away no matter what? A 200ms test for any and all transmissions which fails to detect a busy frequency is likely to miss a lot -- unless the busy frequency detect remains activated and frequently checks for a missed QSO or a Break Break or a SOS or a MAYDAY ... WDYT? -- Thanks! & 73, doc, KD4E ... somewhere in FL URL: bibleseven (dot) com 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/
