[aprssig] APRS Messenger now has APRS over PSK-63

Chris Moulding chrism at crosscountrywireless.net
Mon Mar 1 05:42:17 EST 2010

My plan is to use the standard APRS GPS position for APRS over PSK-63. 
For example:


As well as being "human readable" on the APRS Messenger program it will 
also be readable by the casual radio amateur tuning his digi mode 
receiver to 10.1497 MHz. Even if someone has never heard about APRS they 
should be able to figure out that that is a GPS position and may be 
encouraged to investigate further.

I understand the advantages of the Mic-E format but it's a fairly short 
packet as it is.


Chris, G4HYG

Chris Moulding
Cross Country Wireless (2009) Ltd
7 Thirlmere Grove, Bolton, Lancs, BL4 0QB, UK
Tel/fax: +44(0)1204 410626
Mobile:  +44(0)7752 391908
Website: http://www.crosscountrywireless.net
Company number 6780346 registered in England and Wales  

Lynn W. Deffenbaugh (Mr) wrote:
> Stephen H. Smith wrote:
>> I assume that once APRS Messenger gains the GPS input and capability 
>> to send posits, that this will work to put APRS posits on the map in 
>> any (or all) of these programs.    To make the most of the slow PSK 
>> transmission rate, I would strongly suggest that APRS Messenger use 
>> the highly-compressed MIc-E transmission format since it is about 
>> ONE-THIRD the length of a plain-text APRS posit. The downside is that 
>> it is not human-readable, although ALL APRS mapping applications can 
>> decode it.
> My only comment on the Mic-E format for APRS Messenger is that part of 
> the author's intent was to allow users to visually decode incompletely 
> received or partially garbled transmissions.  Yes, Mic-E will save 
> transmission time, but will take you back to the entire packet needing 
> to be received before any sense can be made of the position.
> Lynn (D) - KJ4ERJ - Just my $0.02
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