Filters for Wideband Active Antennas to Reject Strong Input Signals from Broadcasting Stations in LW, MW and FM Bands

An Application note is added : http://active-antenna.eu/application-notes/filters-to-reject-strong-input-signals/
The AAA-1 amplifier has a very good dynamic range – it is higher than the most RF preamplifiers used in the best transceivers. But it is wideband and there are no filters at the input. Placing the antenna in a very strong filed can saturate the amplifier. This might happened if there is a very strong transmitter near the antenna – e.g. 100 KW BC MW transmitter 2 – 3 km away. The only way to reduce the interference is to use a reject filter at the input for the TX frequency.