Involved in the biosynthesis of prenylated phenazines. Catalyzes the transfer of a dimethylallyl moiety to C-9 of 5,10-dihydrophenazine 1-carboxylate (dihydro-PCA). Specific for both dimethylallyl diphosphate and dihydro-PCA. 5,10-dihydrophenazine 1-carboxylate + dimethylallyl diphosphate = 5,10-dihydro-9-dimethylallylphenazine 1-carboxylate + diphosphate Does not require magnesium or any other divalent metal ions for activity. kcat is 0.435 sec(-1). Antibiotic biosynthesis; phenazine biosynthesis. Mutant can form only nonprenylated phenazine 1-carboxylic acid. Belongs to the aromatic prenyltransferase family.