[aprssig] new IGate software

Dave dave at g8kbv.demon.co.uk
Thu Jun 16 08:57:23 EDT 2011

Well, from personal experience, trying to use my D7 with UiView in the 
past.  Often the system wold just go dormant.  Investigating revealed 
that the D7's TNC had gone in to "sulk mode", and wouldn't respond to 
anything on the serial port, or over RF.

Cycling the radio power, fixed it each and every time.

Thinking that maybe it was the PC, one time after pulling the serial 
cable, & resetting the radio, I used another PC to re-configure 
(initialise) the TNC to UiView's needs, then moved it back to the first 
PC, where it all came back to life again.

Many people world wide have seen this with both the D7 and D700 at times.  
The cause is suspected to be due to a lack of working RAM in the TNC, and 
perhaps something trips over something else, or a circular buffer eats 
it's own tail, resulting in "non communication" effects.

As before, on a quiet channel, they can run for many days, or more.  But 
on a moderatly busy channel, only hours, if your lucky...

I've not had a D710 to play with, so don't know about that, or the Yaesu 
VX8, but I think that uses a different chipset anyway.


Dave G0WBX.

On 15 Jun 2011 at 22:59, la3qma at aprs.la wrote:

> Quoting Dave <dave at g8kbv.demon.co.uk>:
> > Beware the infamous D7 data buffer problems.  If you get seemingly
> > weired lockups where the TNC in the radio just stops responding, or
> > stops decodning packets, you need to power cycle the radio.  It's
> > much worse on a busy chanel, if the RF chanel is quiet, they can run
> > for days.  If busy, it's an achievement if they last an hour.
> Are we sure that it's a buffer problem?
> I reported a fix for the winlink people as they didn't know that TC is
>  a command for all the Kenwood APRS radios. So when you where
> connected  and received the status from winlink it's sending i.e QTC 0
>   QTC 1   etc the radio "locked"
> TC 0 and TC 1 is enabling/disabling the TNC. They have made a  
> workaround for this.
> Anyhow testing is a good thing to do before relaying 99.9% on a
> system.
> Kai Günter

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