[hpsdr] PennyWhistle MOSFET's

[Riho B., ES7AAZ]

Hi Helmut,

thank you for your response. I almost forgot that I have a homebrew 160-6m
PA board with 2xRD70HVF1 MOSFET's - https://i.ibb.co/5FHzHYz/160-6m-PA.jpg
Unfortunately I wasn't able to get it work at the time. So, I bougth
rapidly PennyWhistle instead. I'll give it a try one more time first. I
also have a ALEX TX for that PA not hooked up yet because of the missing
connection cables.

--
*73,*
*Riho ES7AAZ*
*www.qrz.com/ES7AAZ <https://www.qrz.com/db/ES7AAZ>*

Kontakt Helmut Oeller (<dc6ny at gmx.de>) kirjutas kuupäeval E, 8. november
2021 kell 09:41:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Riho,
>
> these old 12V Mitsubishi Mosfets should be only used when you can execute
> predistortion. IMD3 as well gain is bad and not the state of the art.
> Things become terrible if you cascade an other external power amp. LDMOS is
> a much better choice: 16 dB(!) more gain, at least 10 dB more IMD and
> mismatch 1:60 without damage. To get 48V supply voltage is no problem with
> cheap step-up converters.
>
> Happy 'home brewing'.
>
> 73, Helmut, DC6NY
> Am 08.11.2021 um 03:29 schrieb Riho B., ES7AAZ:
>
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> Thank you for the info, Graham. I will replace them then. I see 3rd order
> IM products 24dB below test tone in the two tone test which is not bad at
> all, but could be better.
>
> --
> *73,*
> *Riho ES7AAZ*
>
> Kontakt Graham / KE9H (<ke9h.graham at gmail.com>) kirjutas kuupäeval E, 8.
> november 2021 kell 02:18:
>
>> They are not matched.
>>
>> --- Graham / KE9H
>>
>> On Sun, Nov 7, 2021 at 5:49 PM Riho B., ES7AAZ <es7aaz at gmail.com> wrote:
>>
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> Hi all,
>>>
>>> does anybody know were the MOSFET's a matched pair or not in TAPR
>>> PennyWhistle kit?
>>>
>>> --
>>> *73,*
>>> *Riho ES7AAZ*
>>> *www.qrz.com/ES7AAZ <https://www.qrz.com/db/ES7AAZ>*
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>>
>
>
>
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