SOTABEAMS Toroid 2631801202 (closest available approximation to FT114-31)
Ferrite Toroid, type 31 material. This toroid is suitable for Baluns, Chokes, RF suppression.
These toroids have the same diameter as a FT114-43 or FT114-61 toroid, but the height is larger at 13.85mm (the toroids normally sold as FT114-43 and FT114-61 are 7.5mm tall, but it looks like Fair-Rite do not produce a 31 material toroid in exactly matching dimensions).
Outside Diameter= 1.142 in / 29 mm +/- 0.75 mm
Inside Diameter = 0.748 in / 19 mm +/- 0.50 mm
Height = 0.545 in / 13.85 mm +/- 0.80 mm
References:
- https://kk4z.com/2022/08/15/lightweight-choke-balun/
- Cobweb Antennas https://morsesagas.blogspot.com/p/cobweb-antennas.html