Expert in circuit and set to 7MHz. Readings taken show the additional attenuation of the Expert’s low pass filter,

over the parameters for the  80/40m dipole without the expert in circuit the VSWR increasing sharply above 7.5MHz

1. AIM-4170 analyser straight into 80/40 trap dipole

2. AIM 4170 analyser into Expert 1K-FA connected to 80/40m trap dipole, showing the excellent low-pass

filter characteristics. Note the roll-off above 7.5 MHz