Bandpass receiving filter for 160 meters band tuned on 1.830 MHz

 Top Band RX filter
click to enlage the picture.

This bandpass RX filter has been designed to protect your radio from the strong signals from MW broadcasting band which might overload the receiver. Let's have a look how much it can reject the out of band signals.

The filter's input and output are connected to the 'DUT' and 'DET' miniVNApro SMA ports. The software used for this measurement is vna/J from DL2SBA using the 'transmission mode'.

We can notice the insertion loss at 1.847 MHz is 1.8 dB. The MW broadcast signals are attenuated from 30dB to 80dB.