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we have a product which has radio of 1W maximum output power , we have sent product for FCC through party lab, and they certified the product with 18 dbm only. So we get the certificate with only 18 dbm.
But in field we need to use more power like 25 dbm. So can we use this power even if we certified the module at 18 dbm or we need to repeat the whole FCC test again.
When you have an approval and need to change something, you must be able to reason about if the changes will affect radio and/or EMC characteristics. In this case it's crystal clear: you have to repeat the test. Changing output power to something 5 times larger than tested is a very drastic change. There is no doubt that it will effect most of the radio characteristics, including out-of-band/spurious emissions.
