<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body>I'm going to have to go along with Steve on this one. I've driven around with my Kenwood D710 and heard plenty of packets that couldn't be decoded by the Kenwood (alas, didn't have a laptop to run a software modem to compare). Also, someone I know who runs a digipeater/I-gate has compared using a TinyTrak 4 versus a SignaLink with AGWPE, and the software combo had a much higher decode ratio than the hardware TNC (and not all the missed packets sounded audibly distorted, although many did). <div><br></div><div>Software TNCs just seem to be more effective at decoding lower-quality signals. Now, how many of those lower-quality signals could be fixed is another question; how many of those people just didn't know how to set up their stations (or don't care) versus stations with bad signal paths or hidden transmitter collisions, who knows.</div><div><br></div><div>But the poor quality signals are there. Are we going to be elitist and only accept those matching a particular ideal, or follow the Internet philosophy of "be conservative in what you generate, be liberal in what you accept"?</div><div><br></div><div>Andrew, KA2DDO </div><br><br><br><br><br><br><br><br><br><br><br><br>-------- Original message --------<br>From: Steve Noskowicz via aprssig <aprssig@tapr.org> <br>Date: 8/6/16 10:19 PM (GMT-05:00) <br>To: John Langner WB2OSZ <wb2osz@comcast.net>, TAPR APRS Mailing List <aprssig@tapr.org>, Robert Bruninga <bruninga@usna.edu> <br>Subject: Re: [aprssig] Kenwood D700 Internal TNC Amazingly Mediocre! <br><br><br>Hold on. (I know Stephen is quite astute). However, Keep in mind guys. This test also depends on the signal transmitted from the digi. Set up the digi differently and you can skew the data. Perhaps the digi is setup wrong/differently....<br><br>-- <br> Regards, Steve Noskowicz<br> Science & Technical Advisor<br> http://www.challengerillinois.org/<br><br>--------------------------------------------<br>On Sat, 8/6/16, Robert Bruninga via aprssig <aprssig@tapr.org> wrote:<br><br> Subject: Re: [aprssig] Kenwood D700 Internal TNC Amazingly Mediocre!<br> To: "John Langner WB2OSZ" <wb2osz@comcast.net>, "TAPR APRS Mailing List" <aprssig@tapr.org><br> Date: Saturday, August 6, 2016, 3:18 PM<br> <br> Do the<br> test again. Set up a KWD to beacon at the fixed site once<br> every 12 seconds on a separate frequency and then drive<br> around with the three comparative modems. My experience is<br> the kenwood-to-kenwood performance is probably going to be<br> best under weak signal conditions... Bob<br> On Sat, Aug 6, 2016 at 4:02<br> PM, John Langner WB2OSZ via aprssig <aprssig@tapr.org><br> wrote:<br> The<br> TM-D710 is a great radio, in many ways, but I also found the<br> internal<br> <br> TNC demodulator performance to be rather disappointing with<br> real world<br> <br> signals heard on the air.<br> <br> <br> <br> The document below describes an experiment where a TM-D710<br> is used to listen<br> <br> to APRS activity around my home. We compare the number of<br> packets received<br> <br> by:<br> <br> - The internal TNC.<br> <br> - KPC-3+ connected to D710 speaker out.<br> <br> - A "soundcard TNC" connected to D710 speaker<br> out.<br> <br> <br> <br> The internal TNC decoded the lowest number. You can read<br> about the test<br> <br> conditions here:<br> <br> <br> <br> https://github.com/wb2osz/<br> direwolf/raw/master/doc/A- Better-APRS-Packet-Demod<br> <br> ulator-Part-1-1200-baud.pdf<br> <br> <br> <br> Any TNC can decode a good signal. In the real world we<br> find a lot signals<br> <br> that are not so good. Trying to extract something from<br> them can be a real<br> <br> challenge. Take a look at some of garbage signals people<br> have been<br> <br> transmitting:<br> <br> <br> <br> https://github.com/wb2osz/<br> direwolf/raw/dev/doc/A-Closer- Look-at-the-WA8LMF-T<br> <br> NC-Test-CD.pdf<br> <br> <br> <br> <br> <br> ______________________________ _________________<br> <br> aprssig mailing list<br> <br> aprssig@tapr.org<br> <br> http://www.tapr.org/mailman/<br> listinfo/aprssig<br> <br> <br> <br> -----Inline Attachment Follows-----<br> <br> _______________________________________________<br> aprssig mailing list<br> aprssig@tapr.org<br> http://www.tapr.org/mailman/listinfo/aprssig<br>_______________________________________________<br>aprssig mailing list<br>aprssig@tapr.org<br>http://www.tapr.org/mailman/listinfo/aprssig<br></body></html>