[Amps] FCC Denies Expert Linears' Request for Waiver of 15 dBRule

[Peter Voelpel]

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 at 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.