A reader of Low power Guanella 1:1 tuner balun using a pair of Jaycar LF1260 suppression sleeves asked whether there is an equivalent Fair-rite core for the project.
Fair-rite part 2643625102 (~$4 each from Element14) is of similar size and also medium µ, but slightly different characteristic to the LF1260.
Above is a model prediction of the common mode impedance of a similar choke using the Fair-rite 2643625102 cores.
I have not constructed a balun using these cores, and it does have slightly different characteristics, but somewhat similar performance can be expected.
- Duffy, O. Feb 2007. A model of a Guanella 1:1 choke balun using two Jaycar LF1260 cores. VK1OD.net (offline).
- ———. Mar 2012. Common mode choke design tool. VK1OD.net (offline).
- Low power Guanella 1:1 tuner balun using a pair of Jaycar LF1260 suppression sleeves