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

[Riho B., ES7AAZ]

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
>
>
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