[hpsdr] PennyWhistle MOSFET's

[Helmut Oeller]

Riho, most PA designs are using the fundamental work of Helge O.
Granberg, OH2ZE/K7ES, who published in the 80's a lot of ANs in the
famous Motorla 'cook book'. Helge - sk meanwhile - was a impressive
engineer and I gladly recall  some meetings with him.

Nevertheless physics is incurruptible. If you go for IMD optimization
you have to consider a lot of details. To produce 'dirty' power is no
big deal. But even 'dirty' amps can be cleaned using Warren's fine
adaptive predistortion algorithm.

73, Helmut, DC6NY

Am 09.11.2021 um 11:59 schrieb Riho B., ES7AAZ:
> Hi Helmut,
>
> thank you for your remarks. I'll take a look into the bifilar choke
> for DC feed. This amp is designed by OH7SV, OH2NLT. It should be a
> working thing and give a quite flat 22dB gain from 1 to 60MHz. The
> same guys who designed the JUMA DC TRX and state-of-art LDMOS 1kW amp
> JUMA PA1000 - http://www.jumaradio.com/ But yes, I built it from quite
> a scratch. There was no big story about this amp - schematic, PCB
> 2400dpiPDF image, PCB layout, some pictures and their measurement
> results on their website.
>
> --
> /73,/
> /Riho ES7AAZ/
>
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>
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