Hi Jim, Good to hear from you!
Okay let's test the breakin at 40 words per minute at 5 characters/word and 3 symbols/character that's about 100 msec of total processing time per symbol. That seems pretty reasonable. At 40 WPM a total time budget of: 10 msec T to R 20 msec buffer processing 50 msec DSP chain 5 msec audio buffer fill & xfer 5 msec d/a conversion (very generous I'd think) 10 msec air to ear seems reasonable. So let's see 3x10^9 clock cycles/second X 50 msecs = 1.5x10^8 clocks per symbol for processing... hmmm... I'll bet our flex programmers do it. With at least a 3.0 Ghz machine, I'd say careful testing will show the 5K can do inter symbol breakin at 40WPM. Certainly with a 2.5 Ghz Core Duo... very best Rob AB7CF On Thu, 24 Apr 2008 17:50:46 -0700 Jim Lux <[EMAIL PROTECTED]> writes: > At 05:30 PM 4/24/2008, Robert Dennison wrote: > >Hi guys, > > > ><snip> > > > > >Otherwise only solution I can see is to use pin diodes for T/R and > keep > >filling the receive buffer while transmitting................... > then > >throw the bad stuff in the receive buffer away and process the > rest. > >That would be one heck of a trick without causing a pop! > > > I believe that's what the latest versions of PowerSDR do.. they run > > the Rx continuously, and gate the audio off during Tx time. More > than > a year ago (maybe 2 years), they did do the DSP in half duplex > thing, > and it had just the effect you describe, where you had to wait for a > > buffer to fill before you could hear anything. (worse than that, it > > made the *apparent* delay for QSK turnaround random, which is > really, > really annoying. > > > >very best regards > >Rob > >AB7CF > > > > _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
