| Bandpass receiving filter for 160 meters band tuned on 1.830 MHz | |
 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. |
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Setup of the MiniVNA Pro 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'. |
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We can notice the insertion loss at 1.847 MHz is 1.8 dB. The MW broadcast signals are attenuated from 30dB to 80dB. |
