Rf solutions zulu wireless serial data radio modem evaluation board and dongle rf solutions zulueval m the zulu modem module is a highly integrated rf modem and intelligent controller with a simple interface to achieve a wireless serial data link for data up to 38k4bps over a 2km range the range may be extended by using a suitable antennathe user interface is a standard rs232 style control operating at low voltage all rf operation is automatically controlled with error checking etc so