[aprssig] Multi control station situational awareness - (kenwoods)

Stephen Smith wa8lmf2 at aol.com
Wed Dec 4 14:50:51 EST 2019

Sent from my iPhone

> On Dec 4, 2019, at 1:35 PM, Robert Bruninga <bruninga at usna.edu> wrote:
> Going from memory (always dangerous), I think the D700 used FLAT audio tones – no preemphasis, no-demphasis for best discriminator performance.

I acknowledged this several posts ago - that the D700 has flat TX audio.  I brought this up over a decade ago on this list.  This was at a time when almost everyone else was doing the mic/speaker/hardware TNC kludge, raising the issue of pre-emph/de-emph/no-emph compatibility. 

My current observations are about soft TNC  performance connected to the 6-pin mini-DIN “data” port, which does provide flat discriminator audio.  I wouldn’t think of using a transceiver without this port for packet/SSTV/digimodes.

As it happens, during my extensive controlled shootout of hardware and software TNCs, I was surprised to find the software TNCS were barely affected by presence or lack of pre-emphasis on incoming signals.

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