Fldigi - Kambing UI

Select the SndCrd tab on the configuration dialog.
On Linux Fldigi can interface to the sound card using either the OSS, the Portaudio, or the PulseAudio. Each of
the appropriate libraries must be present on the computer to use that particular sound i/o.
On Windows Fldigi uses the Portaudio sound driver only.
FldigiContents Sound Card Configuration
It is also possible to configure Fldigi with File I/O only, which is useful for testing the application without an
interface to the sound card. In the File I/O only configuration you can record and playback audio files in a
number of different formats including the "wav" format associated with the Windows operating system.
The program will find all active sound cards and the associated drivers for both. Select the sound card and driver
type that will be used with the program. I recommend using the PortAudio device driver if that is available on
your Linux distribution.
If PortAudio is selected then you can either allow the program to use the auto detect to determine the best sound
card sampling rate, or you can pick from the drop down list. If you know your RX and TX sound card oscillator
correction factors you can enter them now. If not you can determine the RX rate correction using a special WWV
modem built into Fldigi. The decoder and encoder logic for each of the various modems require a specific sound
card sample rate which may not be the the actual sound card sample rate. The conversion between the modem
sample rate and the sound card sample rate is accomplished by one of a set of sample rate converters.
Sound card oscillators may have a slight error in frequency that causes their sampling rate to not be the value
specified. This error is usually small enough to be measured in a parts per million. Fldigi uses a technique called
rate conversion to correct the sampled waveform for this error. The error can be measured and the correction
Sound Card Configuration 20