# Can't join OTAA RFM95; seeing different frequencies and SF for RX

**URL:** <https://www.thethingsnetwork.org/forum/t/cant-join-otaa-rfm95-seeing-different-frequencies-and-sf-for-rx/19530>\
**Category:** End Devices (Nodes)\
**Created:** [November 7, 2018, 3:32pm UTC](https://www.thethingsnetwork.org/forum/t/cant-join-otaa-rfm95-seeing-different-frequencies-and-sf-for-rx/19530 "2018-11-07T15:32:49Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![arjanvanb](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/arjanvanb/32/46626_2.png) [@arjanvanb](https://www.thethingsnetwork.org/forum/u/arjanvanb)\
**Post date:** [November 15, 2018, 6:02pm UTC](https://www.thethingsnetwork.org/forum/t/cant-join-otaa-rfm95-seeing-different-frequencies-and-sf-for-rx/19530/9 "2018-11-15T18:02:29Z")

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> [@fadli1987](#):
>
> the gateway is not forward data except at SF 10 (based on TTN gateway console), here the screenshot i took, the counter missing some number.

Am I right to understand that at SF7, 8 and 9 you don’t receive anything at all, and at SF10 you’re missing some packets?

If so, then @jreiss already answered about the problems at SF10.

Regarding SF7, 8 and 9: the higher the SF, the longer the airtime and the better the reception/maximum distance. So, to use a lower (better) SF you need to be improve the reception. Like be closer to the gateway, put your gateway and/or node in a higher position, and so on. See [Best position for a gateway](https://www.thethingsnetwork.org/forum/t/best-position-for-a-gateway/251).

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