[Amps] low cost IRF-MOSFET amps......

[Alek Petkovic]

OK2SAI has 700W on 20m using cheap mosfets.

Look him up on qrz.com and drop him a line. He has photos.

73, Alek
VK6APK

At 03:36 AM 19/03/2006, Dick wrote:
>Hello,
>
>Anybody out there with experience in HF amplifiers using low cost
>IRF-MOSFETs?
>
>For example I found some designs in German magazines:
>
>in Funkamateur from DK6AE, 250W PEP with 6xIRF820
>
>and in Funk from DJ4WZ claiming 400W from 4xIRF730..........(that sounds a
>bit too optimistic to me)
>
>and an older design from DL9AH claiming 750W with 32x IRF730.......
>
>What are realistic figures to expect with the IRF730,820's???
>
>My goal is to build something simple capable of producing at least around
>600-800W on 160m CW/SSB.
>So, a monoband amplifier; but not class E!
>(wonder if anyone tried to use the IRFP450 on 160m........)
>
>Some previous internet search and ask-around work didn't produce a usefull
>design,
>so therfore my request in the amp-reflector.
>
>73
>
>Dick, PA4VHF (160m operator at PA6Z)
>
>
>
>
>
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http://www.qrz.com/vk6apk