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RF Guru
FT240-31 Ferrite Core Material #31
FT240-31 Ferrite Core Material #31
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€14,00 EUR
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€14,00 EUR
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FT240-31 Ferrite Core (Material #31)
The FT240-31 is a large ferrite toroid made from material #31, optimized for low-frequency and HF suppression. With excellent impedance from 1–31 MHz, it is ideal for building high-performance common-mode chokes and baluns for the 160 m to 30 m amateur bands.
Specifications
- Material: #31 ferrite mix
- Outer diameter: 61 mm
- Inner diameter: 35 mm
- Thickness: 13 mm
- Weight: ~120 g
- Frequency range: 1 MHz – 31 MHz
Typical Applications
- Common-mode chokes for 160 m, 80 m, and 40 m bands
- 1:1 baluns for low-band HF dipoles and loops
- Line isolators to reduce RFI and shack noise
- Power line and EMI suppression at HF/LF
Mix 31 provides excellent choking impedance on the low HF bands. For broadband HF use above ~30 MHz, Mix 43 or 52 is typically preferred.
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