[aprssig] aprs.fi supports Kenneth's proposed telemetry format

Heikki Hannikainen hessu at hes.iki.fi
Thu Apr 2 17:44:27 EDT 2020


Recently I made aprs.fi support Kenneth's relaxed telemetry format, which 
basically documents what a lot of people have been doing already: 
transmitting large, negative and decimal values in telemetry without 
limiting to the 0-255 integer range, and without sending EQNS.

Kenneth's proposal is here:


My long story is here (please read before replying):


This makes transmitting telemetry quite a bit easier, since you can skip 
the EQNS mess and just transmit the data. It also adds a lot of resolution 
and range, -2147483648 and 2147483647 in my decoder. It also makes 
receiving telemetry much easier since you don't have to look for EQNS and 
match it up (unless you need to support old transmitters).

Old decoders won't accept the data though. The new decoder and proposed 
protocol is compatible in a way that it does accept data transmitted by 
any old encoders.

I would like to ask other APRS implementations to support this new 
proposal. Please discuss!

   - Hessu

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