Is there any FREE CPI Training that lets you go thorough material without getting a certificate?
I am not aware of any free training. Some of the SAS administrators offer a reduced cost version (without certification), but I have not seen it for free.
If you are using Cambium equipment, it would be very beneficial to take the CBRS training classes that we offer (which are free). The first ones are basic CBRS knowledge and items covering a lot of the CPI considerations.
I just noticed that Comsearch is doing a bunch of free training during the corona crisis through the end of May 2020. There appears to be some CBRS/CPI training. Check it out!