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Android, Google Play and the Google Play logo are trademarks of Google Inc., registered in the U.S. Windows is trademarks of Microsoft Corporation., registered in the U.S. Dolby and the double-D symbol are registered trademarks of Dolby Laboratories.All other trademarks belong to their respective owner. Home Service Products Success Stories News Company Brand About Geniatech Contact US Site Map More Sites About Geniatech Contact US Download Copyright 2011-2019 Geniatech Inc. The ExtIO allows you to manually set the tuner bandwidth of the R820T2 chip. Dvb T Usb Dongle Hdtv Receiver Stellar Drivers The TunerIn 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. At the same time the R820T2 tuner bandwidth is reduced to the visible sample rate, improving filtering. Changing bandwidth with R820T looks good and shows immediate differences in spectrum. E4000 is not so nice, i cant see any difference, for the bandwidths below 3400 kHz. I also put in the wider bandwidths, even wider than the samplerate, which will produce aliasing These might be interesting for wide amplitude modulated signals, e.g. ADS-B. In addition to this soft-filter, minimize the tuner-bandwidth You will still receive aliases, but a bit damped compared to directly sampling at the slower speed. The receptions center frequency (LO) is the most alias-free region. Dvb T Usb Dongle Hdtv Receiver Stellar Download Hayatis ModifiedAs the ExtIO connects via an rtltcp server, you will also need to download Hayatis modified rtltcp server from github.comlibrtlsdrlibrtlsdrreleasestagwin32withbiasTee. To use the driver, first run rtltcp locally simply by double clicking on it, then open HDSDR and select the new ExtIORTLTCP.dll file. For instance in the following image there is a strong pager signal near 157.9 MHz. At first the RTL-SDR is overloaded by the strong signal causing multiple images to appear on the spectrum. But after reducing the tuner bandwidth to 350 kHz the left side of the spectrum is attenuated, and the interfering pager signal is no longer too strong. Previously the driver was only available for Linux, however, now over on SourceForge user randaller has ported this driver to Windows. The interface also has the ability to directly write values to a register, which together with the newly released register datasheet, can be useful for experimenting with the R820T2 chip. Do not forget to allow software to use UDP32323 port in your firewall. Examples: g 5n will return value of R5 s 7 10 15n will set four lowest bits (mask 0x0f) of R7 with value 10 s 12 174 255n will write complete byte to R12 All values should be decimal. You may use this feature to develop own gui controller with beauty knobs. This exposes adjustable sliders for settings like preselection, IF and notch filters and the multiple gain stages on the R820T2. In the standard drivers the filters and gain settings are mostly set automatically, but manually adjusting them could yield better results. The filters are not very strong, but they could be used to help block out an interfering signal, increasing the dynamic range of the RTL-SDR. This modified rtlsdr library is then dynamically preloaded by means of LDPRELOAD and used by the SDR software. This way, no modifications to both gr-osmosdr source and the SDR program are required, instead of waiting for them to implement those controls, we kind of have a separate program that tweaks them. Those are among the nicest features to play with, together with the gain stages.
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