ANORDNUNG MIT IN EINEN NF-EISENKERN EINGESETZTEM HF-EISENKERN EINER HOCHFREQUENZSPULE, DEREN INDUKTIVITAET DURCH VORMAGNETISIERUNG BEEINFLUSST WIRD

Arrangement for placing the iron-core of a high frequency coil into the air gap of a premagnetising low frequency (LF) iron-core which can advantageously be used as a frequency determining element in HF vobulated oscillators. The HF core of the HF coil has a closed shape and the magnetic flux lines extend substantially parallel and breakless within said HF core arranged so in the gap of the premagnetising LF iron-core that the plane of said gapless parallel HF flux lines extends substantially parallel to the premagnetising LF flux lines extending through said gap. A plurality of HF coils can be arranged within the gap of the premagnetising LF core, and the co-tuned HF coils can be used in numerous HF circuits. The magnification factor Q of the HF coils is essentially greater than in the conventionally arranged HF coils.