[aprssig] Kenwood D700 Internal TNC Amazingly Mediocre!
Steve Noskowicz
noskosteve at yahoo.com
Sat Aug 6 22:19:16 EDT 2016
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....
--
Regards, Steve Noskowicz
Science & Technical Advisor
http://www.challengerillinois.org/
--------------------------------------------
On Sat, 8/6/16, Robert Bruninga via aprssig <aprssig at tapr.org> wrote:
Subject: Re: [aprssig] Kenwood D700 Internal TNC Amazingly Mediocre!
To: "John Langner WB2OSZ" <wb2osz at comcast.net>, "TAPR APRS Mailing List" <aprssig at tapr.org>
Date: Saturday, August 6, 2016, 3:18 PM
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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