[aprssig] UI-View, Tiny2 TNC and collisions!

Michael Carey michaelcarey at internode.on.net
Wed Sep 26 05:33:53 CDT 2007

Hi Everybody,
Just an update on my question.
I posted to the Australian APRS email list as well as here and Ray, 
VK2TV hinted to what might be causing my problem.
It's turned out to be the implementation of KISS in my Paccomm Tiny2's 
I tried an EPROM out of a Paccomm EWM (this is a cut back Tiny2 style 
TNC used for commercial applications) and this worked fine, the TNC will 
not transmit over another station until the channel is clear. I also 
tried firmware from a MFJ1270 and this also works fine.
Problem solved, I'm happy. I hope this can help others in the future.

Michael Carey wrote:
> Hi Everybody,
> I run UI-View at home as an I-Gate (VK5ZEA) for the Port Lincoln/Lower 
> Eyre Peninsula area.
> The TNC is a Paccomm Tiny2 and the radio is a Tait T2000 series. I'm 
> using KISS mode, and I've also tried operating it with the AGW Packet 
> Engine as well.
> I've recently noticed (might have been doing it all along, I'm not 
> sure) that this station will happily transmit over other stations 
> without hesitation. Even on an open squelch, which causes the DCD LED 
> to illuminate, command UI-View to transmit a beacon and the Tiny2 will 
> dutifully key up the radio and transmit. Of course, this is not very 
> nice and I would like to prevent it.
> What could be done about this, where is the carrier detect control 
> done with a KISS TNC situation? Is this an issue with the TNC, with 
> UI-View, KISS? I made sure that the two Eyre Peninsula digi's have 
> hardware carrier detect lines connected to stop them from stomping on 
> other stations. I would like the regions I-Gate to observe the same 
> courtesy! :-)
> Any ideas?
> Michael.
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