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« on: September 06, 2016, 1717 UTC »
I think what we have here is two ideologies that aren't going to see eye to eye, and I can see the points made by both sides. My personal opinion is anything less than 100W carrier isn't really worth building because it wouldn't meet any of my goals. On one hand, Antennnae is a budding hobbyist who isn't quite at the engineering level of myself or Stretchy, but given enough time will get there. Rome wasn't built in a day, and neither is understanding this level of electronics by designing and building. I too used to hate torroids, but with a little experience and some neat software tools, I use them in a lot of my designs for their versatility and small size.
Stretchy I can see your point as well, as I am in a similar position with regard to design principles and topologies, but I think it would serve the average hobbyist better to not be as condescending. You've built things like this for a long time, the average joe these are aimed at haven't. While I agree you've got a good product and it seems to be made well, it probably looks pretty daunting to the average appliance operator ham, or someone without a lot of construction experience.
I in the background have been working on something similar based on the current mode class D topology with PWM modulation and would like to scale this to the 5KW level at some point, but that maybe just be a pipe dream. Using the Kahn method of envelope elimination and restoration it is possible to have these modern transmitters do SSB with high efficiency. The basic building blocks are already going to be there in the stereo exciter, one needs only to add the appropriate 45 degree phase shift to the program audio before it hits the balanced modulators, full wave rectify the audio feeding the PWM stage and away you go. This is how commercial shortwave transmitters do it, and it is possible to scale it down to something that the rest of us would find useful.
Keep tinkering and learning boys, it's how all of us advance!
+-RH
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