[aprssig] What is "TNC Channel Switching"?

Stephen H. Smith wa8lmf2 at aol.com
Fri Apr 11 12:49:27 CDT 2014

On 4/11/2014 12:23 PM, Andre wrote:
> op 11-04-14 17:14, Stephen H. Smith schreef:
>> Decades old programs still in use such as APRSplus, WinAPRS, UIview, and more
>> recent ones that don't support KISS such as APRSpoint.
> unless i'm mistaken uiview actualy uses the ~ in it's native uiview to uiview
> messaging so it's an bad exsample to use in this case.

Does anyone actually use UIview in it's native (rather than APRS-compatible) 
mode?   I'm not aware of anyone doing so, at least in North America.

By the way UIview does support KISS mode very well; indeed it's mandatory if 
you want to use it's advanced smart digipeater functions.

However, many users still use the command-line mode instead, since many older 
TNCs don't support KISS.   (Particularly the MFJ 127x series TNCs that crammed 
in numerous other modes, so that there wasn't enough room in the 27256 eprom 
for KISS support.  I have replaced the OEM firmware on countless MFJ 127x TNCs 
with the final release "official" TAPR 1.1.9 firmware precisely to regain the 
KISS capabilities.)

[On the Kenwood D700 and TH-D7, there is another incentive to NOT use KISS mode 
besides the fact that it's buggy and unstable due to a too-small buffer -- the 
GPS pass-through feature doesn't function in KISS mode.]


The bottom line is that:

There are still a lot of APRS installations NOT using the KISS interface 
between the TNC and the computer for various reasons.



Stephen H. Smith    wa8lmf (at) aol.com
Skype:        WA8LMF
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