[aprssig] What is "TNC Channel Switching"?

Chris Moulding chrism at crosscountrywireless.net
Fri Apr 11 10:20:06 CDT 2014

~ or | entered as text in APRS Messenger are filtered out before sending 
as the spec says that they shouldn't be sent over APRS as they are used 
as control characters for Kantronics TNCs.

I was under the impression that other APRS authors filtered them as well 
but I'm ready to be corrected.

By the way Raynet Messenger is another program based on APRS Messenger 
which uses a similar message format allowing CRC-16 checksum messages to 
be digipeated but allows a message length up to 2000 characters. The 
region of the world where it gets most use for emergency comms is South 
America so the lack of the tilde character doesn't appear to be a 
problem as far as I know.


Chris, G4HYG

Chris Moulding
Cross Country Wireless
7 Thirlmere Grove, Bolton, Lancs, BL4 0QB, UK
Tel/fax:     +44(0)1204 410626
Mobile:      +44(0)7752 391908
Website:     http://www.crosscountrywireless.net
Yahoo group: http://uk.groups.yahoo.com/group/cross_country_wireless/

On 11/04/14 15:57, Andrew Pavlin wrote:
> So, this is an ugly but legitimate reservation of this character. I assume APRSMessenger doesn't support Spanish language (or others using the tilde in normal text) or Unicode?
> Andrew, KA2DDO
> Sent from my Verizon Wireless BlackBerry

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