WB8WGA APRS TNC was a project waiting for the the 16F88 pic programing. Now that it's done I decided to test it using the TH-F7 audio output.
Some frames got decoded but not even 10 %, so it looks like that it has a worst performance than my previous APRS decoder with the 16F628 PIC (http://speakyssb.blogspot.com/search/label/PIC%20based%20packet%20decoder). From what i've seen the audio level must be set very well or else it has some difficulty decoding the frames (same on the 16F628 project).
Other ham's report better success than mine on their's project page, anyhow an absolute test will only be made when the VHF transceiver module is programed with the local APRS frequency.
Here's the external link to the schematic I used.
From here: http://www.kh-gps.de/minitnc.htm
And here fully assembled:
Remember TXD and RXD are reversed if you'r not using the GPS input but an RS232 for computer access to the terminal.
My configuration for the quick receiving test was just:
mycal CT2GQV (that's my call...)
mon all (monitor all the frames)
perm (to save configuration)
* use "help" at the prompt for full command list.
Computer terminal was set for 9600 8N1 no hardware or software flow control.