@tipsy Best testing so far has been done by @hexakopter here:
51 vs 52 has roughly 2x the tx power + loads of other features, more resources, etc. The Fanstel NRF52 module’s we’ve selected are considered high-performance/industrial implementations of the chipset & antenna. They have options with op-amps on the antenna as well, but I feel like 2km range might be overkill at a certain point.
Technical spec comparison:
YOU PEOPLE bought us out of the NRF52-S modules by the time I woke up, so I’m building more of these up today and will have them replenished on the website shortly.