The 86230B Single-Band Plug-In make extensive use of microelectronics for superior performance and high reliability at an extremely low price. The unit is completely compatible with either the 8620A or 8620B mainframe. " Frequency Range: 1.8 to 4.2GHz " Maximum Leveled Power: 10 dBm " Harmonic/Spurious: -20 dB/-60 dB " Residual FM: <7 kHz peak