Rf solutions zulu wireless serial data radio modem evaluation board and dongle rf solutions zulu dongle the rf solutions zulu dongle is a highly integrated rf modem and intelligent controller with a plug and play virtual comm port usb interface it can achieve a wireless serial data link at up to 38k4bps over a 1km range the range may be extended by using a suitable antennathe user interface is standard usb operating at low voltage all rf operation is automatically controlled with error