To use the driver, first run rtl_tcp locally simply by double clicking on it, then open HDSDR and select the new ExtIO_RTL_TCP.dll file. Enables tuner bandwidth and decimation controls.Ī precompiled release of the ExtIO dll can be downloaded at /hayguen/extio_rtl_tcp/releases. As the ExtIO connects via an rtl_tcp server, you will also need to download Hayati’s modified rtl_tcp server from /librtlsdr/librtlsdr/releases/tag/win32_with_biasTee. The reception’s center frequency (LO) is the most alias-free region. You will still receive aliases!!!, but a bit damped compared to directly sampling at the slower speed. In addition to this soft-filter, minimize the tuner-bandwidth! The sum produces values requiring more than 8 bit. Y(k) = sum over x( k * (1.decimation) ) x() = input samples from rtl_tcp ADS-B.ĭecimation of Samplerate is an option for very old and slow computers:īefore decimation, a very simple and fast low-quality filter (sum) is applied: These might be interesting for wide amplitude modulated signals, e.g. I also put in the wider bandwidths, even wider than the samplerate, which will produce aliasing! Tuner bandwidth is supported with E4000 and R820T tuners.Ĭhanging bandwidth with R820T looks good and shows immediate differences in spectrum.Į4000 is not so nice, i can’t see any difference, for the bandwidths below 3400 kHz. At the same time the R820T/2 tuner bandwidth is reduced to the visible sample rate, improving filtering.
This allows you to reduce the displayed bandwidth without sacrificing the sample rate. In addition to the tuner bandwidth settings, the ExtIO module also implements decimation controls. In the standard drivers the tuner bandwidth is normally set at a size appropriate for the sample rate, but in this driver using a smaller bandwidth allows you to filter out unwanted signals whilst taking advantage of the decimation a higher sample rate gives you. It can be set almost anywhere between 350 kHz and 8000 kHz. The ExtIO allows you to manually set the tuner bandwidth of the R820T/2 chip. RTL-SDR experimenter Hayati Ayguen ( hayguen on GitHub) has released a version of rtl_tcp and an ExtIO module that allows access to normally hidden tuner settings. ExtIO with Decimation & Tuner Bandwidth ControlsĪn RTL-SDR ExtIO with Decimation and Tuner Bandwidth Controls.Manual gain controls and decimation driver.Measuring Traffic Volumes with Passive Radar.SignalsEverywhere Direction Finding Tutorial.Measuring Filter Characteristics & VSWR.Performing Replay Attacks with RTL-SDR and RpiTX.QRP (FT8, JT9, WSPR etc) Monitoring Station.Decoding 433 MHz ISM Band Weather Stations.GOES 16/17 and GK-2A Weather Satellite Tutorial.
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