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| To: | <[email protected]> |
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| Subject: | Re: LF: FET RDS |
| From: | Minto Witteveen <[email protected]> |
| Date: | Tue, 18 Jan 2011 18:50:55 +0100 |
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Hi Stefan,Thanks for the reference. Interesting schematics, but it is used to produce amplitude modulation. Feeding it PSK31 @ 500 KHz from the soundcard isn't going to get me very popular I suppose.. I am not sure how this design can be used to produce SSB with high(er) efficiency. Regards, Minto pa3bca -------------------------------------------------- From: "Stefan Schäfer" <[email protected]> Sent: Thursday, January 13, 2011 23:27 To: <[email protected]> Subject: Re: LF: FET RDS <snip> <snip>My original 500 KHz design was for linear operation (so I could use psk31) but I only made one qso in PSK, the rest in ordinary CW. A new design can and will be much simpler.Have you heared about a class H modulator? This is a circuit that separates AM and FM. The FM and PA can be done by a class E design and the AM is applied by modulating the supply voltage by a step down converter (the class H modulator). I've never built one but there are some interesting examples at http://www.classeradio.com/classh.htm This would be a good combination to push-up a class E PA for linear mode. Since i do nothing more than CW/QRSS/DFCW i actually do not need one ;-) |
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