A simple Knowledge Center search on the word "compander" reveals this:
Transmit Compander
PowerSDR uses audio compression to make quite sounds louder-the difference,
in decibels, between the loudest and the quietest portion of the audio
input, i.e., its dynamic range. There's a down side also, it can make
unwanted sounds, like breath sounds, also louder. More is not necessarily
better. A good starting point is 3 db. Rarely will one need to increase
compression above 10 db. If you're a soft spoken person, consider operating
with the Compander on all the time. Companding is also very effective on
AM. The choice of microphone will play heavily in the compressor settings.
The compander is used to overcome limited dynamic range in one portion of an
audio system. In amateur radio applications this is typically the high
frequency response. The compander is both a compressor and a high frequency
expander. An ideal setting for the compander is level 3.
There is a DX version of the Compander which has a higher compression ratio
for more "punch", such as trying to bust a DX pileup.
HTH
----- Original Message -----
From: "elan paim" <paimg0...@btinternet.com>
To: <flexradio@flex-radio.biz>
Sent: Monday, January 04, 2010 1:00 PM
Subject: [Flexradio] what is cpdr do ?
is any one can tell me what the cpdr do and how it work ?
thank you
E.P
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