Right now I have the Lithium-Ion AA battery powered prototype with RX working. Currently testing TX code on the bread board prototype. RX performance was tested passing recorded packet data directly into the demodulator on a computer from WA8LMF APRS test CD with the following results.

Stephen Smith WA8LMF's APRS test CD Track 1 demoded 958 packets
Stephen Smith WA8LMF's APRS test CD Track 2 demoded 641 packets

Will need to test alternate TNC's to see how it measures up but based on these numbers it seems to be doing an excelent job of demodulating packets.

The Li-Ion prototype is just a tiny bit wider and longer than the AA battery that is powering it while remaining relatively thin. Based on TX tests with the breadboard prototype I don't believe I will be able to get good TX performance out of this PCB and will have to wait for the next prototype for good TX. It only draws 7 mA in RX mode giving it an approximately 1 week long battery life.

Testing the TX last night with my Yaesu FT-60D as the transmitting radio resulting in currently disappointing performance. While my attic terrestrial TNC was able to decode every packet after I added some low pass filtering to the TNC I could not get a single packet to bounce of a repeater or get into the APRS network. A test using APRSDroid attached to same radio hit 2 repeaters and got into the APRS network on the first transmit. I'm thinking to use the PIC's built in OpAmp to give the DAC some current gain because the load from the radios MIC input appears to be distorting the signal a bit. Also I will need to check to make sure its not over or under driving the audio input, it sounded clear on a second receiving radio but obviously it is not working well.

I expect to have good TX performance by the end of tommorow night. Hopefully I can finalize updates to revision 2 of the prototype PCB and have them ordered by friday.