[aprssig] Kenwood D700 Internal TNC Amazingly Mediocre!

Robert Bruninga bruninga at usna.edu
Sat Aug 6 15:18:59 CDT 2016


Do the test again.  Set up a KWD to beacon at the fixed site once every 12
seconds on a separate frequency and then drive around with the three
comparative modems.  My experience is the kenwood-to-kenwood performance is
probably going to be best under weak signal conditions...  Bob

On Sat, Aug 6, 2016 at 4:02 PM, John Langner WB2OSZ via aprssig <
aprssig at tapr.org> wrote:

> The TM-D710 is a great radio, in many ways, but I also found the internal
> TNC demodulator performance to be rather disappointing with real world
> signals heard on the air.
>
> The document below describes an experiment where a TM-D710 is used to
> listen
> to APRS activity around my home.  We compare the number of packets received
> by:
> - The internal TNC.
> - KPC-3+ connected to D710 speaker out.
> - A "soundcard TNC" connected to D710 speaker out.
>
> The internal TNC decoded the lowest number.  You can read about the test
> conditions here:
>
> https://github.com/wb2osz/direwolf/raw/master/doc/A-
> Better-APRS-Packet-Demod
> ulator-Part-1-1200-baud.pdf
>
> Any TNC can decode a good signal.  In the real world we find a lot signals
> that are not so good.   Trying to extract something from them can be a real
> challenge.  Take a look at some of garbage signals people have been
> transmitting:
>
> https://github.com/wb2osz/direwolf/raw/dev/doc/A-Closer-
> Look-at-the-WA8LMF-T
> NC-Test-CD.pdf
>
>
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