Ok I'll bite. I'm not even sure that I have a "spectum modulator", actually I'm sure I don't. That radio was available when I bought mine, but I opted for the cheaper one. The 4 in 1 board on the heli does arm with the green light blinking initially and then glowing solid green, but the heli does not respond to the radio at all. So I'm still scratching my head. I'm wondering if it needs some special type of crystal?