Agilent 5087-7021 Directional Coupler 300 kHz-9 GHz. Fully Tested! admin You can even use two of these as a basis for a network analyzer! These couplers are in good working order and have been individually tested. Type-N 300 KHz-9 GHz Directional Coupler. These are nominal 17dB couplers.GiMiTEC.infoAAS, Column, consumable, GC, GiMiTEC, HPLC, spare part 21 September, 2020