PSK AUDIO OUT sounds like a Modem
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#1 PSK AUDIO OUT sounds like a Modem
open-fixed
nobody
None
5
2007-06-10
2007-01-12
Anonymous
No
Vojtech,
Enjoying your excellent program. Thanks for your efforts. I read earlier posts about audio distortion when sending PSK so I attempted to duplicate it with my IPAQ 2215. I was succesful with several different PDA's. I found that the distortion occurs when there is strong audio present at the mic when setting Pocketdigi into transmit. If the input sound is silent (radio volume down or mic turned off) no sending distortion occurs. This is quite repeatable and occurs only on the two PSK modes, not on RTTY or MFSK.
My solution for now is to turn down my radio audio before hitting send on PocketDigi and as soon as the program begins sending I can turn the audio back up. Works every time. I guess a more elegant soulution would be PocketDigi muting the mic input breifly before the program started sending. Thanks again for your efforts.
Bob WD8QLY (radioral@localnet.com)
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The problem is caused by a buggy sound card driver which does not support full duplex mode, but does not indicate it either. I have a bugfix ready and it will be released soon.
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Fixed in 1.0.9.
It is caused by bad sound card full duplex support.
73, Vojtech