On Sat, Jun 22, 2013 at 10:21 AM, Jay <[email protected]> wrote: > Andrew > > I'm not seeing what you are. I can get the filter width in both USB and > DIGU down as small as 40hz and still get something decoded. what AF freq > are you centering the filter on in USB. Im using 1500hz as the center for > both, it is harder to get a filter centered at 1500hz in USB mode but can > manage it. it's also kind of tough to get a 31hz signal centered in a 40hz > filter, but I'm not seeing any difference in the width of the filters I can > set in either mode. >
Filter resolution depends on DSP buffer size. Larger buffers mean sharper filters and better filter resolution. I bet you are running different DSP buffer sizes for USB and DIGU. If you set them the same the filters will behave the same. But if you are running digital modes you want to run DIGU, not USB. You do not want the speech processing to distort your signal so run DIGU. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 [email protected] +1.916.877.5067 (USA) -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 [email protected] +1.916.877.5067 (USA) _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software innovation and other technical SDR topics.
