[FADCA] Interesting Note

[Russell Oder]

Hi, Chuck, I will be in Tampa tomorrow at PACCOMM. I hope to be there by 9
AM.
I will be returning to Orange Park later in the day.

If you are in the area around lunch how about going to the resturant we went
to when I was down before.

Regarding your "interesting note." I've been told that you can connect a
REAL TNC to the radio to get the REAL Packet features.  I have the sister
hand held with the "stupid" built in TNC but have never used it to send
anything. I have used it to monitor APRS to see what it does. Has anyone
connected a REAL TNC to either the D-7 or it's sister hand held - can't
remember the model number.

Russ

----- Original Message ----- 
From: "Chuck Hast" <wchast at gmail.com>
To: "FADCA" <fadca at mailman.qth.net>
Sent: Sunday, December 19, 2004 11:02 PM
Subject: [FADCA] Interesting Note


> We discovered that the Kenwood D-7 series embedded TNC will not pass
> non-pid f0 packets at the hamfest the other day, we tried to use the D-7
> which I have in my van as a digi to get to Tampa (we were able to hit
> the tampa switch just fine from my van, so I set the portaswitch up to
digi
> via the van back to tampa, no joy. At first we thought it was a timing
issue
> because it kept on doing a rr on the frame previous to the level 3 frame,
> but when I went to the van and started looking at the link from the
vantage
> point of the digi, I realized that the digi was not passing the pid 01
(ROSE
> level 3 stuff) frames. I did not realize that digi's even looked at the
PID in
> a Ax25 frame as long as the frame was ax25. So if you are going to use
> a Kenwood with the embedded radio as a digi to digipeat  level 3 stuff
> don't waste your time.
>
> That puts Kenwood even lower on my list of data radios, in truth the TNC's
> for those radios were more designed for the APRS crowd than anything
> else, they do APRs pretty well, but are a bit stupid when it comes to
regular
> packet.
>
> Here is another bit of stupidity, the kenwood people in their infinite
wisdom
> have chosen to drop the ax25 ver 2, it is only running ver 1 in the TNC
soooo...
> If the far end sends a DISC frame your end will send a UA confirming the
discon-
> nect. BUT if the far end does not hear the UA come back it will send a
> DISC again,
> the disconnected TNC should send a DM saying I AM disconnected, shut up
and
> go away, but it does not, it sets there and sends NOTHING, so the far end
sends
> whatever it's retry count is of DISC frames until it times out. Don't
> you just love
> spectrum pollution like that? I will give them one good set of points
> the 9k6 modem
> and radio part work pretty well though the radio still needs about it
seems like
> 100ms to get things in the right state in order to send or receive data.
>
> Indeed it appears that connected mode was sort of a after thought, too
> bad because
> the radio is a pretty good box for packet. Sure wish there was a
> simple way to put
> in a different eprom, but I think it is all surface mount....
>
>
> -- 
> Chuck Hast
> To paraphrase my flight instructor;
> "the only dumb question is the one you DID NOT ask resulting in my going
> out and having to identify your bits and pieces in the midst of torn
> and twisted metal."
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