These inductances are decoupling choke for RF application from 300 kHz to 700 MHz in power stage such as to bring power supply to transistor collector and drain and power f.e.t., but also as T bias or to provide power supply in DC on a RF cable.
The specified frequency is the best frequency for this application and every inductance has at least 200Ω of impedance at both ends of the range, and in the middle of the range is higher (see listed data). This to guarantee a correct RF decoupling on DC.
The coils has been tested with network analyzer and HP4191A impendance meter to guarantee these frequency range, both in terms of decoupling and in terms of insertion loss, but also like ROS introduced by this choke in case of most critical application as bias T on 50Ω line.
