📡 Filtro pasabanda para RTL-SDR: mejora la recepción de tu SDR

Purchase link: https://s.click.aliexpress.com/e/_c31... In this video, we review a set of bandpass filters purchased on AliExpress for approximately €15, designed to improve the reception of our RTL-SDR receivers, Chinese clones, and other budget SDR devices. RTL-SDRs are very popular due to their low price, but they have a significant limitation: they typically lack good input filtering. This can lead to saturation, imagery, noise, and interference when strong signals are nearby, such as AM stations, commercial FM, or other signals outside the band we want to listen to. In this test, we analyze a set of bandpass filters with four main ranges: 0.5-1.5 MHz, 4.5-12 MHz, 12-30 MHz, and 80-110 MHz. This allows for improved reception on medium wave, HF bands such as 40 meters, 30 meters, 20 meters, 15 meters, and 10 meters, as well as commercial FM. In addition, we measured each filter with a NanoVNA to see its response curve, attenuation, and actual performance. We also opened the filter to examine its internal construction, SMA connectors, coils, capacitors, and overall build quality. The result is quite interesting: although it's not a professional or extremely narrow filter, for its price it offers reasonable attenuation, good construction, and can greatly improve RTL-SDR reception, especially when we need to increase the gain without introducing interference or unwanted signals. If you use RTL-SDR, SDRSharp, SDR++, budget SDR receivers, HF antennas, shortwave, pinging, DXing, or want to improve reception without spending too much, this video can help you decide if this bandpass filter is really worth it. Let me know in the comments if you use filters in your SDR setup and what interference you experience in your area. 👍 If you enjoyed the video, please like, subscribe to Radio Bunker, and turn on notifications for more content on SDR, amateur radio, antennas, RF measurements, filters, and electronics. Chapters 00:00 Introduction to the Bandpass Filter for RTL-SDRs 00:23 Why RTL-SDRs Need Filters 00:49 How Professional Radios Filter 01:36 Price, AliExpress, and the Accessory's Usefulness 02:06 Frequency Ranges of the Filter Set 02:37 P2 Filter for HF: 4.5 to 12 MHz 03:30 P3 Filter: 12 to 30 MHz for High Bands 03:54 P4 Filter: Commercial FM from 80 to 110 MHz 04:23 What to Expect from an Inexpensive Bandpass Filter 05:15 How It Helps Reduce Interference and Saturation 06:20 Measuring the P1 Filter with a NanoVNA 08:38 Measuring the P2 Filter for 40 Meters 10:10 Measuring the P3 and P4 Filters 11:48 Disassembly and Internal Inspection of the Filter 13:14 My Opinion Final verdict: Is it worth €15? Hashtags #RTLSDR #SDR #BandPassFilter #AmateurRadio #HamRadio #RadioBunker #LU8MIL #Shortwave #HF #RTLSDRBlog #NanoVNA #AliExpress #HFFilter #DXing #SDRSharp #SDRPlusPlus #Antennas #RFElectronics #RadioFrequency #RFMeasurements #CommercialFM #MediumWave #RFFilter #SDRReceiver #Interference