My problem turned out to be power related. Whenever the TT3 would transmit, the voltage would drop to around 4.7v and it would reset. I added a LM7805 with 4 AA batteries, and it is working reliably now. I also moved it from the breadboard to a circuit board so I can test it on the highway.
Finally was able to get my homemade APRS transmitter working tonight! I’m using a Byonics TinyTrak 3 SMT TNC with a Parallax GPS, hooked to my Wouxun HT. There seems to be something weird going on with the PTT circuit that I haven’t quite figured out yet. The TT3 doesn’t always seem able to pull down the 5V PTT singnal on the handheld. I’m thinking about adding an external transistor if I can’t get it to work reliably.
Erin and I drove the Westy up to the mountains above Silverthorn Friday night for a Winter camping trip. The wind was crazy that night, so we slept downstairs. We were very warm and comfortable under a thick down comforter.
Erin and I walked over to the park on Monday to try out her new Alpina metal edge skiis. Fun times!
http://4wdx.com/
Banjo Hangout