[hpsdr] PennyWhistle MOSFET's

[Riho B., ES7AAZ]

Hi again Helmut,

this is how my homebrew 160-6m 2xRD70HVF1 PA board (60x105mm) looks like -
https://i.ibb.co/KmH95b4/160-6m-PA1.jpg Everything seemed OK, but output
was terrible and I never connected it to the PennyLane. I used an old RF
signal generator for testing. Today I think I had a bad signal source, but
most probably I didn't use that instrument properly.

P.S. Yeah, it is a homebrew 50Ω dummy load as well, HI.

--
*73,*
*Riho ES7AAZ*

Kontakt Riho B., ES7AAZ (<es7aaz at gmail.com>) kirjutas kuupäeval E, 8.
november 2021 kell 16:30:

> 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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