[aprssig] mic-e: technical info or source code ?? (simple)

Robert Bruninga bruninga at usna.edu
Wed May 29 16:50:57 CDT 2013


>  The actual packet encoding is described in aprs101.pdf.

And it is a lot simpler to implement than it reads.  The latitude is
simply the TOCALL of the AX.25 frame in ASCII decimal numbers but with a
higher order bit either on or off to indicate some other non related info.

And the Longitude is just the first 3 bytes of the data (after the type
character) encoded modulo 91 also in ASCII.  Plus a few other details.

Bob, WB4APR/


Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 5/29/2013 4:28 PM, Kristoff Bonne wrote:
> Hi,
>
> I'm trying to find the technical documentation on the mic-e protocol.
> (i.e. the 300 ms burst to be send at the end of a voice transmission
> on a repeater).
>
> There is a webpage on info.aprs.net, but that does not even mention
> the modulation scheme, baudrate, etc.
>
> Is the open-source code available for decoding and encoding mic-e
> transmissions? Is there an open-source hardware implementation of it?
>
>
>
> 73
> kristoff - ON1ARF
>
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>

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