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Message-ID: <CD8A01AA07E44A2CB7A5F64E4A64F0A8@PcMinto>
From: Minto Witteveen <minto.witteveen@gmail.com>
To: <rsgb_lf_group@blacksheep.org>
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In-Reply-To: <4D2F7C5F.9090103@iup.uni-heidelberg.de>
Date: Tue, 18 Jan 2011 18:50:55 +0100
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Subject: Re: LF: FET RDS
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Hi Stefan,

Thanks for the reference. Interesting schematics, but it is used to pr=
oduce=20
amplitude modulation. Feeding it PSK31 @ 500 KHz from the soundcard is=
n't=20
going to get me very popular I suppose.. I am not sure how this design=
 can=20
be used to produce SSB with high(er) efficiency.

Regards,
Minto pa3bca

--------------------------------------------------
From: "Stefan Sch=E4fer" <schaefer@iup.uni-heidelberg.de>
Sent: Thursday, January 13, 2011 23:27
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: FET RDS

<snip>
>> My original 500 KHz design was for linear operation (so I could use=
=20
>> psk31) but I only made one qso in PSK, the rest in ordinary CW. A=
 new=20
>> design can and will be much simpler.
> Have you heared about a class H modulator? This is a circuit that=20
> separates AM and FM. The FM and PA can be done by a class E design=
 and the=20
> AM is applied by modulating the supply voltage by a step down conver=
ter=20
> (the class H modulator). I've never built one but there are some=20
> 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.=20
> Since i do nothing more than CW/QRSS/DFCW i actually do not need one=
 ;-)
<snip>=20