# SF and required SNR not matching

**URL:** <https://www.thethingsnetwork.org/forum/t/sf-and-required-snr-not-matching/38335>\
**Category:** End Devices (Nodes)\
**Created:** [July 6, 2020, 2:58pm UTC](https://www.thethingsnetwork.org/forum/t/sf-and-required-snr-not-matching/38335 "2020-07-06T14:58:57Z")\
**Posts on this page:** 1\
**Showing post:** 2

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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:** [July 6, 2020, 8:15pm UTC](https://www.thethingsnetwork.org/forum/t/sf-and-required-snr-not-matching/38335/2 "2020-07-06T20:15:35Z")

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Did you enable ADR on the device, and does it send an `ADRAckReq` [after 64 uplinks](https://www.thethingsnetwork.org/forum/t/adr-and-gateway-distance/38112/5)? If you can capture a full LoRaWAN packet from the gateway then you can easily check if [an online decoder](https://runkit.io/avbentem/lorawan-packet-decoder/branches/master) shows that `FCtrl.ADR` is set.

As for learning more: did you read [the ADR documentation](https://www.thethingsnetwork.org/docs/lorawan/adaptive-data-rate.html)?

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