6491T2-135 Decode performance
- Feb 9, 2009Over the weekend I did some testing with a very early model DR-135
and the latest version the MK-III.
The MK-III does NOT have the serial port "buzz" in the speaker any longer.
As I suspected the unit decodes FLAT audio better than PROPERLY
pre-emphasized audio since there is no de-emphasis network on the T2-135.
With my test files I was able to decode AFSK pre-emphasized audio on
both radio's at 1.0uV. (Not stellar performance). I can normally get
radio's to decode around .5uV and a KPC-3 and .7uV with a TNC-2 clone.
With FLAT audio the early model would decode about .75uV and the
MK-III around .68uV.
It really needs about a 3db per octave de-emphasis network. I will
work on that in a few weeks and see if I can improve it.
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