[hpsdr] Fwd: PennyWhistle MOSFET's

[Riho B., ES7AAZ]

HI Helmut,

yes, the adaptive predistortion is a very good thing, but as far I know
Ozy+Mercury+Penelope doesn't support that thing. This setup performs more
than good for me and I don't want to upgrade it. Recently I've seen wierd
SSB signals on 20m. Signal itself looks good and 2700Hz BW, but the bottom
side is very wide and looks like the ocean waves. That's why I started to
explore how does my setup do and I found that my setup does exactly the
same wierd thing on SSB. I only need a good 160-6m amp, not the perfect
one. I hope that this 2xRD70HVF1 amp is exactly what I need for my setup.

--
*73,*
*Riho ES7AAZ*


Kontakt Helmut Oeller (<dc6ny at gmx.de>) kirjutas kuupäeval T, 9. november
2021 kell 14:07:

> 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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