No problem if you're transmitting a continuous sine wave. But CW is a series of pulses that need shaping by the DSP. The rise and fall have lots of other harmonic components.
> -----Original Message----- > From: [email protected] [mailto:flexedge-boun...@flex- > radio.biz] On Behalf Of Erwin van den Bosch (PA7N) > Sent: Wednesday, November 24, 2010 9:31 AM > To: [email protected] > Subject: Re: [FlexEdge] CW transmit Flex 1500 and latency > > Tim, I think you don't understand my post. Please read again or tell me > why you need a DSP buffer to create a sinus wave? CW is nothing more then > a sinus wave. No DSP filtering needed to be able to output a sinus wave. > > Regards, > Erwin. > > On 24-11-2010 13:55, Tim Ellison wrote: > > You can't have a zero size DSP buffer. DSP is the "heart" of the radio > and does other things in addition to determining filter characteristics. > > > > I recommend waiting for CW, Part II > > > > > > -Tim > > > > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of Erwin van den > > Bosch (PA7N) > > Sent: Wednesday, November 24, 2010 3:34 AM > > To: [email protected] > > Subject: [FlexEdge] CW transmit Flex 1500 and latency > > > > Just a thought: > > > > When I install 2.0.16 all DSP buffer sizes are 2048. For SSB and Digi > modes I can understand that because the filtering is better with A large > buffer size instead of A small buffer size. > > > > But when transmitting CW I think the DSP transmit buffer (not the > USB/audio buffer) can be zero because you don't need filtering on the CW > carrier. Just generate a nice sinewave (via calculation or a simple lookup > table). By doing this without DSP buffers the latency may be a little less > when transmitting CW. > > > > Regards, > > Erwin > > > > _______________________________________________ > 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 development and > experimentalist who are using beta versions of the software. _______________________________________________ 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 development and experimentalist who are using beta versions of the software.
