Firstly apologies if this is not the correct place to post this but wasn't sure which site would be good to ask regarding about measurement uncertainty calculation.
I am trying to calculate the combined measurement uncertainty, however the uncertainties I want to combine are using different scales:
Carrier level uncertainty: ±0.5dB (logarithmic)
Modulation uncertainty: ±5% (linear)
Converting either from one format to another will not give me a simple ±value in the other format
What is the best way to combine these uncertainties?