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added mentioned 3rd party source
*Transmitter: Si4063
=== Peripheral attachment points ===
* U-Blox GPS is attached to USART_2 on the STM32 via pins PA2 and PA3* External serial port (USB connector) is attached to USART_1 (PA9 and PA10), sharing TX/RX with the external I²C bus.
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File:DFM-17 NOAA Label.jpg|The label sticker NOAA(US) puts on the back of their DFM-17 radiosondes
File:Dfm17-2layers.png|A view of the DFM-17 Radiosonde showing both layers to better assist tracing connections while reverse engineering the hardware.
File:Label id speculaton.jpg|Possible meanings of the internal labels and values. The date code in particular which may be useful to date production times. NWS sondes have the same cryptic string printed on the outside of the sonde where the mfg. date normally is on other countries'. "TU" may just indicate the board comes with sensors according to a third party source<ref>https://sondehunt.de/language/en/archive/1189</ref>.
File:Sensor stalk pinout.jpg|Pinout of the DFM-17 sensor stalk. Not all pins are used, and some seemingly are connected to a trace but end abruptly.
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