[aprssig] What sets the max packet length for APRS

Bryan Hoyer bhhoyer at gmail.com
Sat Nov 10 11:21:32 EST 2012

APRS1.01 states 67 characters for a message and up to 43 for a comment, yet I see packets twice that long on APRS.FI. This ones 109 after the :

KA8OAD-1>APU25N,K8YSE-1,WIDE1,K8UI-1,WIDE2*,qAR,K8LI-1:@101613z4108.09N/08136.25W_190/004g005t057r000p020P020b10220h51FWX_http://pages.sssnet.com/kend Fairlawn,OH

AX.25 says 256 bytes for the UI payload

A Tweet is 140 characters

An SMS is 160 characters

Is it just the display limit of some radios?

Just exploring the capabilities and limitations of APRS

Bryan Hoyer - K7UDR

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