====== radio ======
  * [[https://docs.nordicsemi.com/bundle/ps_nrf52840/page/radio.html|RADIO — 2.4 GHz radio]]
  * [[https://devzone.nordicsemi.com/f/nordic-q-a/73912/the-time-between-tx-and-rx|the time between TX and RX]]


===== ramp up time =====

  * fast ramp-up 40us (from disabled state)
  * turn around >20us possible without ''disabled'' state: [[https://devzone.nordicsemi.com/f/nordic-q-a/17999/nrf5x-radio-state-transition-from-transmit-to-receive-ramp-up|nRF5x radio state transition from transmit to receive, ramp up]]