A probehead for pulsed electron-nuclear double resonance (ENDOR) experiments with radio-frequency fields up to 20 mT is introduced. The probehead consists of a bridged loop-gap resonator for X-band microwave frequencies surrounded by a solenoidal rf coil that generates the radio-frequency field, and serves as microwave radiation shield. A broad band and a tuned circuit for pulsed ENDOR experiments between 1–200 and 1.5–26 MHz, respectively, are described. Details of the probehead design and characteristics of the rf circuits are given. The performance of the probehead is demonstrated by pulsed ENDOR spectra in solids and liquids between 8 and 150 MHz and by an ENDOR experiment that requires a stepping of the static magnetic field strength.

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