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Title: CLASS D or CLASS E: Which One Should I Choose Post by: W1KSZ on April 12, 2018, 09:43:25 PM I am getting more serious about building a Class D or E AM Transmitter, something in the 300 Watt avg range.
Before I can get started, I need to decide which Class to build, D or E. What are the advantages of one over the other ? Which one should I choose and why ? Also, after deciding, I will need a source of DIY info, schematics, pictures, etc. Thanks for your help, 73, Dick, W1KSZ Title: Re: CLASS D or CLASS E: Which One Should I Choose Post by: W1KSZ on April 12, 2018, 09:47:33 PM My bad guys, I forgot I had a similar question earlier. Old age is a ^&*%*&.
73, Dick, W1KSZ Title: Re: CLASS D or CLASS E: Which One Should I Choose Post by: W2PFY on April 13, 2018, 09:58:54 AM I don't know a source for class D but Steve WA1QIX has about all could want for your edification.
http://www.classeradio.com/ (http://www.classeradio.com/) Title: Re: CLASS D or CLASS E: Which One Should I Choose Post by: M0VRF on April 13, 2018, 03:04:32 PM I use Class D/E or that's what I think it is has class E waveforms with class D B/W = >1MHz on 40m.
If you stick to the design by VE3ELQ using the SiC FETs from Cree you'll be fine. My version uses 4 GaN Fets and runs 100W carrier with 500W peaks with a 48V PSU. Pic attached. Title: Re: CLASS D or CLASS E: Which One Should I Choose Post by: n1ps on April 15, 2018, 08:14:05 PM For Class E, go with the QIX designs. Bulletproof and probably more than 100 have been built. Steve gives you complete designs including the modulator (PWM) and even a VFO.
For Class D you can also look at Jay W1VD site. He has some nice designs. He recommends the QIX PWM I believe. Either way these projects are intensive and take time ;). I think it took me about a year to put together a class E project. But well worth the effort IMHO. Peter Title: Re: CLASS D or CLASS E: Which One Should I Choose Post by: steve_qix on April 15, 2018, 09:10:03 PM It is possible to build a complete transmitter from the ground up, in about a month. But of course it won't be a pretty as the one Pete (N1PS) built ;)
Title: Re: CLASS D or CLASS E: Which One Should I Choose Post by: KF1Z on April 17, 2018, 11:13:03 AM I noticed your post in "Wanted".
. If you can populate a PC board, you can pretty likely build Steve's design. A lot of folks have built these successfully with 'limited' skills. Doesn't matter what the end product looks like, only matters that it works :-) If there are certain parts that you decide you can't, or don't want to attempt, there are a few people around who can help you out as well. Either by advice here, by email, or even putting together parts for you. Title: Re: CLASS D or CLASS E: Which One Should I Choose Post by: steve_qix on April 17, 2018, 08:49:25 PM I noticed your post in "Wanted". . If you can populate a PC board, you can pretty likely build Steve's design. A lot of folks have built these successfully with 'limited' skills. Doesn't matter what the end product looks like, only matters that it works :-) If there are certain parts that you decide you can't, or don't want to attempt, there are a few people around who can help you out as well. Either by advice here, by email, or even putting together parts for you. Holy Missing Person, Batman !! Wow, Bruce - it's been FOREVER !!! What's going on? Send me an email (I still have the same one I've had for 20 years). Good to see you're still interested. Regards, Steve |