45 MHz High Pass Filter

To protect my 50 & 70 MHz transceiver against high RF from the HF station, the antennas are only separated 1 meter apart I designed a High Pass Filter with a cut-off frequency of 45 MHz. For this design I used the ELSIE software. You can find this super software HERE

The filter proofed to be working fine. The results were the following:

S21      50 MHz      -0,4dB

S21       70 MHz     -0,3dB

S21       30 MHz     -42dB

S21       20 MHz     -70dB

S11       50  –  70 MHz    20 – 25dB

Very nice results. Tuning is done by streching and pressing the inductors for best result.