Hoping to receive more signal with less BCB interference.

A device used to filter out the AM Broadcast bands allowing improved reception ahead of the KiwiSDR.

Minimising AM Broadcast Band RF overload...

This simple exercise was designed to reduce the AM broadcast band reception but allow other frequencies to pass through to the KiwiSDR front end. Utilising a band stop filter design, the rf from the high power AM transmitters could be greatly reduced which also helps reduce intermods at the KiwiSDR front end.

Here are some plots and a photo of my build. A schematic is included in the links below. Enjoy. YMMV.

Close-in sweep view

 9kHz to 3MHz sweep.

30MHz sweep view

 9kHz to 30MHz sweep.

Filter layout view

 Manhattan style layout.

Useful Links


VK5FQ website
12/02/14 Start build of new website.


Steph - VK5FQ
Adelaide, South Australia,