[aprssig] HF APRS igates on fldigi

[Stephen H. Smith]

On 5/8/2020 10:20 PM, Joe Bennett wrote:
> Not sure about the Mic-E issue. It is a valid Mic-E frame on 2 meters. I 
> suspect it is something with how FLDIGI is handling the frame.
> 
>

The latest packet as received here:

    A3NAM-12>APX210,ECHO:=3854.24N/09446.04Wx



There are actually THREE formats for position reports:

- Plain test human-readable lat/long values in "APRS format" with the symbol 
control codes interspersed.

- APRS compressed format that encodes both lat and long in the payload as 
"ASCII gibberish" (actually two 4-bit hex representations of decimal digits per 
byte, that get displayed as an ASCII symbol with the same byte value.

- Mic-E format Mic-E replaces the destination address (In your case  "APX210") 
with a bunch of seemingly-random alpha-numeric "ASCII gibberish" that encodes 
the latitude.  The packet payload only contains the longitude, also in "ASCII 
gibberish", for the absolutely shortest possible transmission.



If you think your application is sending Mic-E, it is apparently incorrectly 
labeling "APRS compressed formt" as "Mic-E".     ALL the transmissions from 
youi that I monitored tonight have "APK210" in the destination address field. 
Not one had the kind of ASCII gibberish here that would be a Mic-E format posit.



  I'll have to look further into the WIDE2-2 path. Looks like Xastir is
> defaulting to WIDE2-2 even when I leave the path(s) blank. I changed it to ECHO 
> for the time being.
> 
> I heard you once this evening via packet. No other digital stations heard here 
> otherwise. Few folks running phone on the channel...
> 

I heard them, and some CW activity.  MFSK16 is so robust that it plowed right 
through them with no difficulty!   The CW was especially dramatic on my 
waterfall display.  The MFSK transmissions were occupying a span from about 
1575 to 1825 HZ, with the CW at 1500 Hz at the same time -- no problems with 
either.

____________________________________________________________
Stephen H. Smith    wa8lmf (at) aol.com
Skype:        WA8LMF
EchoLink:  Node #  14400  [Think bottom of the 2-meter band]
Home Page:          http://wa8lmf.net

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