Try to join, no answer

[arjanvanb (Arjan)]

ABP does not require downlinks for the activation. For OTAA, downlinks are needed, and the following applies as for the distance:

@kersing

Sending with the devices in close vicinity might cause crosstalk between channels resulting in downlinks at the wrong frequency because TTN instructs the gateway to respond at a frequency based upon the uplink frequency, if that is the wrong one your node won’t receive any answer as it is listening on the wrong frequency.

The distance may also be too large, or the node may fail to receive the Join Accept (if any!) for other reasons. See some debugging steps in OTAA activation fails - is this caused by distance? - #6 by arjanvanb, Can I use TTN without my own gateway if one is nearby? - #2 by arjanvanb and OTAA no Join Accept after changing batteries - #2 by arjanvanb.