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

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.

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