# Can LMIC 1.6 be set up to use a single channel and SF?

**URL:** <https://www.thethingsnetwork.org/forum/t/can-lmic-1-6-be-set-up-to-use-a-single-channel-and-sf/5207>\
**Category:** End Devices (Nodes)\
**Created:** [February 4, 2017, 10:43am UTC](https://www.thethingsnetwork.org/forum/t/can-lmic-1-6-be-set-up-to-use-a-single-channel-and-sf/5207 "2017-02-04T10:43:39Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![mogyoros](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/mogyoros/32/25844_2.png) [@mogyoros](https://www.thethingsnetwork.org/forum/u/mogyoros)\
**Post date:** [April 15, 2017, 12:07pm UTC](https://www.thethingsnetwork.org/forum/t/can-lmic-1-6-be-set-up-to-use-a-single-channel-and-sf/5207/5 "2017-04-15T12:07:33Z")

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Hi @itacos !

You are seeing the packet loss, beacuse in that case the node is trying to use the other base channels (frequencies: 868.3 & 868.5 MHz). Which you can’t disable using the lmic lib in this manner. I faced this issue aswell.  
The only way is to modify the base channels/frequencies in the lib (lorabase.h, EU868\_F2&F3).

For the rest of channels/frequencies (3-8) you probably can manipulate this using LMIC\_setupChannel command.

We all now that this could violate the frequency usage (1%), and is not lorawan compliant, so shall careful doing so!

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