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Most common setup for general development and testing. We estimate our boards spend ~90% of their time in this configuration during software development.
Keeping the nylon standoffs installed (not shown) is recommended. RBF jumpers for USB powered dev work are commonly "GND" and "VUSB". See ‣. Unlike the other configurations below, jumpers are needed in the inhibit screw terminals.
Most common for benchtop development and testing when full radio output power is needed. Also helpful for characterizing power consumption or energy harvesting.
Since we don't have rail switches, foot switches, or RBF pins installed in the inhibit screw terminals, these inhibits need to be by passed (using adequately sized jumper wire) in order for the battery board to supply power to the mainboard.
You may notice the mainboard is upside down as compared to the benchtop (USB powered) example. After countless tests and example scenarios, we've found this configuration best fit our various mission needs.
Although these standoff dimensions have worked for multiple missions, they are merely an example starting point from which to base your own designs.
If you're not aware, Pumpkin Inc. has been instrumental in teaching and supplying educational and hobbyist builders of CubeSats for nearly as long as Prof. Twiggs and Prof. Puig-Suari have been teaching about them.