[hpsdr] HPSDR(Mercury, Pannylane, adn Metiz) and PowerSDR version

[Riho B., ES7AAZ]

Hi Helmut,

yeah, 2400Hz SSB TX is a kind of overkill, I switched back to 2700Hz SSB
TX. Today I had a 20m QSO with LA3XIA. He was very amazed that I'm running
only 16W into vertical delta loop. He gave me 59, but there was QSB and he
said, "You have a very good quality signal, even if the signal drops down
to 55 it sounds like 59+20". It's a quite heavy, but still good compression
(CFC) what does that. In short, PowerSDR mRX does a great job in low TX
power configuration.

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

Kontakt Riho B., ES7AAZ (<es7aaz at gmail.com>) kirjutas kuupäeval K, 20.
oktoober 2021 kell 16:55:

> Hi Helmut,
>
> yes, the conventional PC electret microphone is what I'm using here. It's
> quite cheap one, but gives very good overall SSB results. However, W1AEX
> using higher end external audio system there via VAC.
>
> --
> *73,*
> *Riho ES7AAZ*
>
> Kontakt Helmut Oeller (<dc6ny at gmx.de>) kirjutas kuupäeval K, 20. oktoober
> 2021 kell 16:12:
>
>> Hi Riho,
>>
>> the approach is certainly ok, however allow me two remarks:
>>
>> That mentioned 2,7 kHz is the *net* bandwidth, i.e. difference between
>> the lower edge and the upper edge of the audio spectrum. No problem to use
>> 100 - 2800 Hz.
>>
>> Each microphone has an individual frequency response. This 'input'
>> can/will significantly modify these praised W1AEX profiles. All HPSDR stuff
>> applies the TI audio codec TLV320 with a 14 kohms input resistance. This
>> device is developed in particular for high impedance electret microphones
>> and each mismatch (e.g. with dynamic mic) deforms the frequency response
>> dramatically. New adjustment is always advisable.
>>
>> 73, Helmut, DC6NY
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20211021/7978a7db/attachment.html>