These audio clips were recorded from AM QSO's. Most were taken directly from the detector of the receiver (usually a Hammarlund Super Pro Series 200 or National NC-303) onto high quality digital audio tape (DAT) or analog cassette. The IF bandwidths range from 6-18 kHz depending on the prevailing band conditions. The recorded audio was input to the computer, either a Mac IIci using a Pro Audio Spectrum 16 digitizer card or a PowerMac G4. Further processing and editing was performed using SoundSculptor II. |
|
The finished clips were
then encoded into the QuickTime or RealAudio formats. The QuickTime clips
use 8, 11.025 or 22 kHz sampling and either IMA 4:1 or Qdesign compression.
The RealAudio clips were encoded using the 15.2, 16 or 32.4 kbps encoders.