Several new features are now available on the NovaSource G6. First, the ability to perform internal frequency modulation (FM) within the NovaSource G6 unit was added making the G6 suitable for new PCS and cellular development and test applications. Second, a standard serial interface replaces the parallel interface found on other NovaSource family products. This change eliminates prior compatibility issues while it also improves the unit's overall user-friendliness. Finally, NovaSource G6 includes an entirely new frequency sweep function, which is a very useful tool for applications such as filter testing and birdie searches, along with general lab use.