# Why is RX\_SLOT 1 not used?

**URL:** <https://www.thethingsnetwork.org/forum/t/why-is-rx-slot-1-not-used/2656>\
**Category:** TTN Network and Services\
**Created:** [June 30, 2016, 11:28pm UTC](https://www.thethingsnetwork.org/forum/t/why-is-rx-slot-1-not-used/2656 "2016-06-30T23:28:43Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![telkamp](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/telkamp/32/35697_2.png) [@telkamp](https://www.thethingsnetwork.org/forum/u/telkamp)\
**Post date:** [July 1, 2016, 6:59am UTC](https://www.thethingsnetwork.org/forum/t/why-is-rx-slot-1-not-used/2656/3 "2016-07-01T06:59:48Z")

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> [@Rob65](#):
>
> I am not sure if I agree with this; nodes that are on the edge of a gateway’s range may need to use SF12 in order to reach the gateway and since the gateway uses the same transmit-power there is a chance that a message send using SF9 can not be decoded by my node.

That would indeed be a problem. Therefor, in RX2 we transmit at 27 dBm, and the increase in power (over the 14dBm uplink) offsets the loss of sensitivity going from SF12 to SF9.

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