O P E R A T I O N C H A P T E R 6
Hint: There is a trade-off to be made of minimum latency versus sharpest
(narrowest) filters. Both are driven by the buffer (DSP and Audio)
settings and the sample rate setting. For optimal CW performance,
you may need to use the 48kHz sample rate, which will give the
narrowest filters. Next you need to set your audio buffer as low as
your computer system will tolerate. The DSP buffer setting should
then be set as high as possible, without introducing disturbing latency.
See Appendix A for a more detailed explanation.
Note: CW VFO Frequency Offset
The VFO on the PowerSDR software is designed to show the zero beat
of the CW tone relative to the selected CW Pitch. This allows click-
tuning of CW signals as well as the traditional CW VFO readout. This
also enables the VFO to remain constant when switching from CWL to
CWU mode. Every effort is made to preserve a CW signal when
switching between any SSB and CW modes.
Internal Keyer
If using PowerSDR’s internal keyer, open the Setup Form – DSP Tab, Keyer Sub-Tab shown in Figure
142 below. Several of the controls in this form are also available in the Mode Specific Controls – CW
(8) section on the Front Console.
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140 2003-2009 FlexRadio Systems
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