Fair-Rite 5943003801 MnZn Ferrite Toroid, 43 material, for EMI suppression between 20 and 250MHz, and wideband transformers up to 50MHz. ui=800. These are ideal for use as noise or common mode suppressors on cables to reduce interference on the HF bands, or constructing baluns.
Size: Diameter 61mm, Height 12.55mm Hole Size 36mm, color Grey, Fair-Rite PN# 5943003801
See W1CG Low Power Balun Manual for more information on making a 4:1 Balun.
This product is generally available in higher quantity than stocked in around 1 week POA