Looks like it's working reasonably well, though the 20 meter band fell out shortly after we all got it installed. More testing tomorrow for sure. :)
-Mooneer K6AQ On Sat, Dec 19, 2020 at 2:26 PM <[email protected]> wrote: > Have it loaded and running now. > > Working on a couple others as I type to get some end to end testing. > > Many thanks David, and best of the holidays. > > > Walter/K5WH > > -----Original Message----- > From: David Rowe <[email protected]> > Sent: Saturday, December 19, 2020 3:34 PM > To: [email protected] > Subject: [Freetel-codec2] FreeDV 1.5 - 700E and OFDM compression > > I've been working on a new FreeDV 700E mode, and some compression for > FreeDV 700D and 700E to increase the average power. A Christmas present > for you to play with > > 700E is designed to handle fast fading like 700C, but like 700D has > powerful FEC. My bench tests indicate 700C & E are equivalent on moderate > fading channels (2Hz dopdler/2ms spread), but on very fast fading (4Hz/4ms) > 700E does better - 700C & D fall over. 700D works better at lower SNRs on > slow fading channels. > > I've also been testing against compressed SSB, which as Helmut suggests is > pretty hard to beat, as it's so robust to fading. However 700E is hanging > on quite well with fast fading, and becomes noise free as the SNR increases. > > -/- > > The second innovation is compression of the 700C/D/E waveforms, to > increase average power significantly. > > Please be careful adjusting the Tx drive and especially enabling the Tool > - Options - Clipping. It can drive your PA quite hard. I have managed 40W > RMS out of my 75W PEP transmitter. Make sure your transmitter can handle > long periods of high average power. My IC7200 and > FT-817 seem OK. > > At the same equivalent peak power - 700D is doing well when compressed SSB > is -5dB SNR and rather hard on the ears. > > -/- > > Peter VK3RV, Jose LU5DKI, and Barry VK3BRT tried 1.5.0 last night and > report it works on real HF channels. > The latest manual describes the new features: > > > https://github.com/drowe67/freedv-gui/blob/118cb66ee4679518185db871ec0ae68071c406a4/USER_MANUAL.md > > > You can download Windows 32 and 64 bit versions of FreeDV 1.5 here: > > http://rowetel.com/downloads/freedv > > -/- > > I'd be interested in any feedback. If you have an interesting test case > (e.g. a bug or comparing SSB to FreeDV), pls send me off air recordings of > signals (FreeDV Tools-Record File from Radio). That helps me make objective > comparisons. Recordings are much more useful to me than anecdotes or > subjective reports. > > Thanks, > David > > > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >
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