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

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Wed May 29 15:55:37 CDT 2013


And for completeness, here's the page that has the AX.25 specification PDF:

http://www.tapr.org/pub_ax25.html

Decidedly NOT for the faint of heart!

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

PS.   http://tinyurl.com/pv9zclc describes "faint of heart" as

> "Faint" is the correct word to use in the phrase "faint of heart". In 
> this usage, it refers to timidity, but is also used to describe a 
> temporary loss of consciousness

That "loss of consciousness" is certainly what happens to me every time 
I read that specification.  aprs101.pdf is simple by comparison.

On 5/29/2013 4:37 PM, Lynn W. Deffenbaugh (Mr) wrote:
> Mic-E is one form of coordinate and status encoding used by APRS which 
> is AFSK modulation (1200/2200 Hz) of an AX.25 bit stream using 
> exclusively UI packets.  The actual packet encoding is described in 
> aprs101.pdf.
>
> 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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