[hpsdr] PennyWhistle MOSFET's

[Riho B., ES7AAZ]

Helmut, I don't have much lab instruments currently here. But I have a
small 50Ω sma dummy load soldered to the piece of coax. If Penelope sees
50Ω dummy load the TX carrier signal looks damn clean. So, there is nothing
wrong with Penelope here. If I connecting the Penelope to the PennyWhistle
and sending singal out into the 20m delta loop and using small indoor
antenna for RX the TX carrier looks terrible.

Kontakt Riho B., ES7AAZ (<es7aaz at gmail.com>) kirjutas kuupäeval K, 10.
november 2021 kell 18:33:

> In Duplex there is only 15cm coax and opened T/R relay here  So, no
> Mercury overdrive, more likely underload.
>
> --
> *73,*
> *Riho ES7AAZ*
>
> Kontakt Helmut Oeller (<dc6ny at gmx.de>) kirjutas kuupäeval K, 10. november
> 2021 kell 18:20:
>
>> Not sure that you interpret TX display in Duplex mode correctly !?
>>
>> 73, Helmut
>> Am 10.11.2021 um 17:08 schrieb Riho B., ES7AAZ:
>>
>> Helmut, thanks for all tips and suggestions. Sure, I will take a look
>> into it what's going on here. Fortunately I have a Pinocchio as well for
>>  measurements and troubleshooting. Yes, the PowerSDR shows the signal how
>> it's going out from DSP.  In Duplex mode it shows how the signal going out
>> from the radio.
>>
>> --
>> *73,*
>> *Riho ES7AAZ*
>>
>>
>> Kontakt Helmut Oeller (<dc6ny at gmx.de>) kirjutas kuupäeval K, 10.
>> november 2021 kell 17:07:
>>
>>> Riho, don't give up! Penelope and Pennylane were (are) fine boards.
>>> Search for the reason. Check as already suggested signal quality at the
>>> input of amp U6 (OPA2674), check 12V supply voltage for ripple etc. and
>>> output match (T2). When I recall correctly PowerSDR shows the base-band
>>> signal in TX mode and not the real output signal. Hence I would
>>> recommend to use an external analyzer to evaluate the RF signal.
>>>
>>> 73, DC6NY
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>
>
>

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