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

[Helmut Oeller]

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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