DIY bandpass filters for SDR - 140MHz and 1090MHz - not an elec engineer! - Album on Imgur
SAW band pass filter 315MHz 433MHz 868MHZ 1090MHz 902MHz 915MHz 1590MHZ FOR WIFI RTL SDR receiver Ham Radio Amplifier|Instrument Parts & Accessories| - AliExpress
RTL-SDR Filter Cards | Multichannel SDR Transceivers and Audio Arrays
Low Pass Filter for RTL-SDR Direct Sampling Mode
Band Pass Filter BPF 1575M 5.8GHZ for 2.4G WIFI Bluetooth GPS RTL-SDR receiver | eBay
I made a 137MHz NOAA bandpass filter. Here are some pictures of the filter and spectrum! : r/RTLSDR
janielectronics on eBay
A simple homebrew high pass filter | The SWLing Post
Preamplifier and Bandpass filter for SDR
A dirt cheap “spectrum analyzer” with an RTL-SDR dongle. | Hans Van Ingelgom
3-30 MHz Band-Pass filter with continuous tuning - YouTube
Band Pass Filter for HF and VHF Amateur Radio Bands | AmoghDesai.com
137 MHz BP Filter and Noise Source analysed with RTL-SDR Dongle
I made and tuned a helical band-pass filter! [Details in the comments] : r/amateurradio
REVIEW OF NOBU'S HF UPCONVERTER, GALVANIC ISOLATOR AND 14 MHZ LOW PASS FILTER