When a Force 300 in a PtP set up using AP and CPE modes gets a "hit" in DFS. When, or how long does it take to return to that original frequncy? It seems like we have a couple radios in this configuration, and they never seem to return to the primary frequency. Or maybe we aren't waiting long enough....
DFS is a 30 min wait time before returning to the channel that received the 'hit'. However, if another hit occurs, it will basically prevent operation in that channel. I wouldn't recommend PTP in DFS channels for anything close to a mission critical backhaul, and would only recommend for very short links away from any potential interference sources. 5.1GHz might be a nice alternative.
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But, it should return, or at least try, and keep trying?
Or, if it tries again, and it gets a hit, it will NOT go back...?
It will go back and try, but there is a very good chance that another DFS hit will occur and the channel won't be useable again for 30 min (basically over and over).
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