<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><br><br><div id="AppleMailSignature" dir="ltr">Sent from my iPhone</div><div dir="ltr"><br>On Dec 4, 2019, at 1:35 PM, Robert Bruninga <<a href="mailto:bruninga@usna.edu">bruninga@usna.edu</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="Generator" content="Microsoft Word 15 (filtered medium)"><style><!--
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--></style><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Going from memory (always dangerous), I think the D700 used FLAT audio tones – no preemphasis, no-demphasis for best discriminator performance.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p></div></div></blockquote><br><div>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. </div><div><br></div><div>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.</div><div><br></div><div>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.</div><div><br></div><div><br></div><div><br></div></body></html>