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

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Wed May 29 16:23:52 CDT 2013


Yes, any APRS decoder should be able to monitor the repeater audio and 
pick up the Mic-E trailing packet burst.  At least, that's what I've 
read, but have never personally experienced.

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

On 5/29/2013 5:00 PM, Kristoff Bonne wrote:
> Hi Lynn,
>
>
> OK, this means that the mic-e messages on a voice-repeater are 
> modulated the same way as the AFSK messages on 144.800.
>
> In that case, I guess I can just let multimon-ng monitor the output 
> frequency of our analog repeater. Correct?
>
>
> 73
> kristoff - ON1ARF
>
>
>
>
> On 29-05-13 22:37, 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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