publish packet radio post

may need some updates though...

content/posts/2024/64-packet-radio-vara-mobilinkd-and-digirig-on-linux/index.md

@@ -18,7 +18,6 @@ tags:
 - signalink
 - sdr
 
-draft: true
 ---
 
 Out of curiosity I began another "research-session" because it is really time to get
@@ -395,6 +394,21 @@ $ rtl_fm -f 144.8M -g 42 -s 22050 -l 20 - | multimon-ng -t raw -a AFSK1200 -
 
 #### With sdrangel
 
+Add a channel and select <kbd>Packet Demoulator</kbd>.
+
+Once packet gets demodulated, add a feature and select APRS:
+
+![Upper left portion of the whole SDRAngen window highlighting the 'Add feature' button](add-feat.png)
+
+![Example view of the APRS feature window](aprs.png)
+
+The APRS feature windows let you connect to APRS-IS (top right of the APRS window).
+
+You can also add another feature called <kbd>Map</kbd> to display the received
+APRS packets on a map.
+
+![Cropped view of the map feature window](map.png)
+
 ### Packet radio
 
 #### With direwolf
@@ -407,18 +421,19 @@ $ rtl_fm -f 144.950M -M fm -s 200000 -r 32000 -g 35 | direwolf -n 1 -r 32000 -b
 $ rtl_fm -M fm -f 144.950M -s 22050 | direwolf -n 1 -r 22050 -b 16 - 
 ~~~
 
-#### With multimon-ng
-
 #### With sdrangel
 
+Add a channel and select <kbd>Packet Demoulator</kbd>.
+
+![An example of a decoded packet session](packet-session.png "A quick connection try at home
+(the gateway is out of reach so we don't get an answer back)")
+
 ### VARA HF
 
-We can only decode with VARA HF in monitor mode.
+We can only decode with VARA HF in monitor mode. It is possible that we can't decode anything.
 
 ### POCSAG
 
-#### With direwolf
-
 #### With multimon-ng
 
 ~~~console
@@ -427,3 +442,13 @@ $ rtl_fm -M fm -f 438.025M -s 22050 | multimon-ng -t raw -a POCSAG512 -a POCSAG1
 
 #### With sdrangel
 
+![Settings of the main settings window](main.png)
+
+Set the frequency to <kbd>438.025 MHz</kbd> (in Austria) and add a channel
+(pink mark box). Select <kbd>Pager Demodulator</kbd> and start decoding
+(click the Play button).
+
+That will decode the set POCSAG modulation (defaults to 1200 baud).
+
+![Example of the decode in SDRAngel](pocsag-decode.png)
+