# Force 300 in PtP DFS channel return **URL:** https://community.cambiumnetworks.com/t/force-300-in-ptp-dfs-channel-return/63743 **Category:** ePMP **Created:** [October 8, 2019, 10:24pm UTC](https://community.cambiumnetworks.com/t/force-300-in-ptp-dfs-channel-return/63743 "2019-10-08T22:24:54Z") **Posts on this page:** 1 **Showing post:** 5
### Author: ![Chris\_Fikert](https://d10gw3vjmzyp8.cloudfront.net/letter_avatar_proxy/v4/letter/c/87869e/32.png) [@Chris\_Fikert](https://community.cambiumnetworks.com/u/Chris_Fikert) #### Post date: [October 9, 2019, 4:25pm UTC](https://community.cambiumnetworks.com/t/force-300-in-ptp-dfs-channel-return/63743/5 "2019-10-09T16:25:40Z")
If you are using channel bonding (2+0), it is possible that you may be the source of the interference.  Ensure that you have 100MHz of guard band between the two center frequencies.  [https://community.cambiumnetworks.com/t5/Sub-6-GHz/PTP550-Separate-Internal-Clocks-Per-Radio-Causing-Possible/m-p/105454#M2848](https://community.cambiumnetworks.com/t/ptp550-separate-internal-clocks-per-radio-causing-possible-channel-bonding-self-interference/62194/2) --- _[View the full topic](https://community.cambiumnetworks.com/t/force-300-in-ptp-dfs-channel-return/63743)._