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| + | [title] PCB investigations - rear side |
|---|---|
| + | [* black] On the top of the PCB is the UBX-6010 GPS module which gets its data from a ceramic chip antenna on the edge of the pcb. No quadrifilar helical antennas and manual almanac downloads - this is one integrated puppy which just has an UART interface. |
| + | [* black] Besides the GPS ist the Frontend. Not an analog frontend, mind you. Vaisala is using two ring oscillators with the temperature and humidity sensors in there feedback paths, varying there frequency - clever! |
| + | [* black] On the lower half is all the magic for an VHF Telemetry Radio you need in 2014. Just a SI4032 Radio Chip and a few support components, no HF p*rn, unfortunately. That said, making the sonde transmit in the 70cm-HAM-Band or even the 433-MHz-ISM-Band is just a question of sending the right bytes over the SPI Interface. |
| + | [* black] On the bottom there is the XDATA-Expansion Port which is mainly jused for connecting ozone and othe peripheral sensors. Physically, it's just a 2 mm 2x5 pin header. Vaisala official pinout lists just GND and an UART, but there is more to discover: various power rails and, more importantly, a SWD interface for interfacing with the STM32. |