It seems the ADF4350/ADF4351 is a versatile little RF synthesizer, ranging from low VHF to well into the microwave spectrum.
Designing a lab model
The Arctic Tracker project is not dead (yet). The idea is to develop a tracker device with traits like these:
Receiving APRS packets
Receiving and decoding of APRS packets is now implemented and it seems to work. It is more tricky than sending
Transmitting APRS packets
APRS packet transmission is now tested and it works. It is clear that the SA818 radio module is not usable
Linking Yaesu DR-1X repeaters without expensive hardware
My club has two DR-1X repeaters on the same site. One is on 2 meters, the other on 70 cm. We
Interfacing the DR-1X Repeater
The documentation for the Yaesu DR-1X repeater has a number of shortcomings. This post will describe my findings so that
Using the DAC
Can we use the 12 bit DAC of the Teensy 3.1 to generate AFSK (Audio Frequency Shift Keying) signals? Lets
Hacking the radio module
It works. I connected the SA818 module to the Teensy 3.1 and wrote some code to control it. I tested
Webpage updates
We have recently (among other things) updated and rearranged categories to better and more intuitively link blog posts to their
Towards a next generation tracker
The Polaric Tracker developed by LA3T was just the right APRS tracker for search and rescue services. Now the question