A friend of mine, ex Telefunken design engineer, already built a class E amp
around 2x8 cheap SIHP10N40D transistors at less then 1 Euro each.
With 15W of drive output is 1200W.
Even without predistortion IMD3 is less then -30dB.
20 transistors will do your legal limit easily.
73
Peter, DJ7WW
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Manfred
Mornhinweg
- A high efficiency, high gain, deliberately non-linear, legal-limit
final stage. This might take the shape of a simple overdriven broadband
class AB stage, or perhaps a class E stage with tuned, band-switched
output tanks. It might use a single BLF188XR for about $150, or several
small switchmode MOSFETs for far less money.
To these hardware ingredients I would add some freely available
software, such as Pavel Denim's software for the Red Pitaya, plus
PowerSDR, using closed-loop, RF-feedback amplitude and phase
predistortion to linearize the amplifier. The software has this already
implemented.
The result would be a legal-limit, high efficiency, high performance,
compact, black-box HF transceiver to be used with a PC, for under $1000
total cost, if you are good at ordering surplus power supplies on eBay,
and such.
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