137 MHz BP Filter and Noise Source analysed with RTL-SDR Dongle
SAW band pass filter 315MHz 433MHz 868MHZ 1090MHz 902MHz 915MHz 1590MHZ FOR WIFI RTL SDR receiver Ham Radio Amplifier|Instrument Parts & Accessories| - AliExpress
DIY bandpass filters for SDR - 140MHz and 1090MHz - not an elec engineer! - Album on Imgur
bandpass filter
Software Defined Radio and the RTL-SDR USB Dongle
A dirt cheap “spectrum analyzer” with an RTL-SDR dongle. | Hans Van Ingelgom
RTL-SDR Filter Cards | Multichannel SDR Transceivers and Audio Arrays
Amazon.com: Broadcast AM Reject High Pass Filter (2.6 MHz HPF) by RTL-SDR Blog : Electronics