JLC Non-Magnetic Variable Inductors Johanson Manufacturing / Knowles JLC Non-Magnetic Variable Inductors guarantee a constant winding pitch and consistent relationship to the printed circuit board. These inductors consist of 2 to 7 turns with a 32nH to 118nH inductance range. The non-magnetic variable inductors offer a 0.7GHz to 1.2GHz Self Resonant Frequency (SRF) range. These inductors feature superb shock, vibration, and thermal tolerances. The non-magnetic variable inductors are available in 7mm high in SMD, vertical SMD, and thru-hole versions. Typical applications include MRI/NMR systems, radios/jammers, power amplifiers, radar, avionics instrumentation, and test equipment.