New to the quest. Just binge read the entire thing last night.
@Musical Blue, I'd recommend "Charge Cartridge (0/3 Novice)".
We can't power the radio from our own Linker Core, but can from a large enough external mana supply. Even if they're shown as bullets, cartridges are essentially mana batteries! Perfect for doing something like powering a radio. I'm not going to pretend that converting something designed to dump stored mana into a Linker Core to dump it into the radio in a steady stream is easy, but the results are certainly worth some experimentation. Plus can you imagine everyone's faces when they learn little miss blaster 9 wants
more power...