The HPSDR has now implemented predistortion and soon I think Walter K5WH, who is very active on FreeDV will have it for his TX. Perhaps, he'll share his experience with predistortion with us in the near future.
Mel ----- Original Message ----- From: "Bruce Perens" <[email protected]> To: "David Rowe" <[email protected]> Cc: <[email protected]> Sent: Wednesday, March 05, 2014 8:17 PM Subject: Re: [Freetel-codec2] FDM Subband Thoughts > On 03/05/2014 02:55 PM, David Rowe wrote: >> based on my experiments of 1 year ago I'm not sure if PAPR improvements >> will give us much gain on most of today's HF radios. > Many Amateur manufacturers publish a derated power spefication for "AM > carrier" or for FSK. I took a quick look at specifications for various > radios and didn't notice that the derate value was over 6 dB. This seems > consistent with your observation that a "100 Watt" portable rig driven > to about 20 Watts ran hot. On the other hand, there are a lot of radios > that are rated at their full power for FSK and FM, and in the case of > the Icom 9100, for digital voice (using GMSK). Some of them just turn > the fan higher. > > I'm not pushing the issue, but nor do I think you should discount it > entirely. > > Thanks > > Bruce > > ------------------------------------------------------------------------------ > Subversion Kills Productivity. Get off Subversion & Make the Move to > Perforce. > With Perforce, you get hassle-free workflows. Merge that actually works. > Faster operations. Version large binaries. Built-in WAN optimization and > the > freedom to use Git, Perforce or both. Make the move to Perforce. > http://pubads.g.doubleclick.net/gampad/clk?id=122218951&iu=/4140/ostg.clktrk > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ Subversion Kills Productivity. Get off Subversion & Make the Move to Perforce. With Perforce, you get hassle-free workflows. Merge that actually works. Faster operations. Version large binaries. Built-in WAN optimization and the freedom to use Git, Perforce or both. Make the move to Perforce. http://pubads.g.doubleclick.net/gampad/clk?id=122218951&iu=/4140/ostg.clktrk _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
