You're right, Joe: you don't want to push predistortion to the max available power out on a given band. It may be a little less than 100 W to ensure headroom under all load conditions.
And these days, predistortion is done with DSP. The K4 has a lot more horsepower in this regard than the K3/K3S. Wayne N6KR > On Nov 4, 2019, at 4:54 PM, Joe Subich, W4TV <li...@subich.com> wrote: > > On 2019-11-04 7:34 PM, W2xj wrote: >> One could always have a modular approach which is how other industries >> approach this. > Sure, a modular approach would work well ... a 12V/60W PA or > a 40V/200W PA that would plug into the same space. Not exactly > rocket science. > > > BTW, predistortion is common practice is a number of industries. > > Yes, I'm very familiar with predistortion - it was common in analog > UHF TV transmitters 30+ years ago and integral to broadcast HDTV > today. Still, proper setup was not something for an "appliance > operator" and tracking changing operating conditions (e.g., fading > batteries) takes a lot of computational horsepower. On top of that, > predistortion works best when the amplifier chain is not pushed for > every last fraction of a watt of output - best results will always > be obtained when the PA chain is reasonably clean to start with. > > 73, > > ... Joe, W4TV ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
