[hpsdr] PennyWhistle MOSFET's

[Riho B., ES7AAZ]

Hi Rod,

I have the very first HPSDR hardware which doesn't support PureSignal and
therefore PureSignal is permanently disabled in the software.

--
*73,*
*Riho ES7AAZ*

Kontakt Rod Brink (<kq6f at comcast.net>) kirjutas kuupäeval K, 10. november
2021 kell 02:49:

> Sounds like there is insufficient feedback signal for PureSignal to  work
> properly.
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows
>
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> *From: *Riho B., ES7AAZ <es7aaz at gmail.com>
> *Sent: *Tuesday, November 9, 2021 4:42 PM
> *To: *Hpsdr Mailing List <hpsdr at lists.openhpsdr.org>; Helmut Oeller
> <dc6ny at gmx.de>
> *Subject: *Re: [hpsdr] PennyWhistle MOSFET's
>
>
>
> P.S. To be correct they are rising in any order - sometimes only 3rd,
> sometimes only 5th, etc., sometimes all together. It looks like a code
> stuff is doing that.
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> Kontakt Riho B., ES7AAZ (<es7aaz at gmail.com>) kirjutas kuupäeval K, 10.
> november 2021 kell 02:00:
>
> Helmut, how to explain this kind of Penelope behavior? I observing
> Penelope output only in the two tone test @ 250mW. Sometimes there are no
> visible IMD products, sometimes IMD products are rising, 3rd order abt.
> 10db.
>
>
>
> Kontakt Riho B., ES7AAZ (<es7aaz at gmail.com>) kirjutas kuupäeval T, 9.
> november 2021 kell 14:40:
>
>
>
> 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*
>
>
>
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> 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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> --
>
> *73,*
>
> *Riho ES7AAZ*
>
> *www.qrz.com/ES7AAZ <https://www.qrz.com/db/ES7AAZ>*
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>
>
> --
>
> *73,*
>
> *Riho ES7AAZ*
>
> *www.qrz.com/ES7AAZ <https://www.qrz.com/db/ES7AAZ>*
>
>
>
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