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    Digital TV Stick USB 2.0 DVB-T DAB FM Antenna Receiver Mini SDR Video Dongle for Household Television Playing Decoration

    • Digital TV Stick USB 2.0 DVB-T DAB FM Antenna Receiver Mini SDR Video Dongle for Household Television Playing Decoration
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    Overview
    Reviews
    Certification:NONE
    Origin:CN(Origin)
    Color:black
    Support resolution:1080P
    Video input:Wireless transmission
    Video output:USB
    Support operating system:Windows 7
    type:TV box

    Digital TV Stick USB 2.0 DVB-T DAB FM Antenna Receiver Mini SDR Video Dongle for Household Television Playing Decoration
    Sticks with this combination (RTL2832 + R820T) are relatively on
    the market. The main difference to all the other supported tuners so
    far is that it uses a Low-IF (3.57 MHz) architecture instead of
    Zero-IF. That means the tuner is only connected to the In-Phase ADC
    input, and the internal down converter of the RTL2832 is generating the
    complex samples. This has the benefit of having no DC offset spike in
    the middle of the spectrum.
    So far the tuner driver comes straight from the kernel driver that
    Realtek supplies, and setting gain manually is not supported yet,
    although functions for that seem to exist.
    There is still is a lot that needs to be done, the best thing most
    likely would be to completely rewrite the driver, or at least clean it
    up dramatically. Initializing the tuner takes way too long at the
    moment, since the driver produces a lot of I2C traffic, most of it
    being redundant as it seems.
    The driver ly had a frequency limitation of 40 MHz to 900 MHz,
    but tests showed that the PLL of my stick can achieve lock up to 1766
    MHz, and indeed both ADS-B at 1090 MHz and L-Band DAB at 1463 MHz, as
    well as GMR at 1556 MHz can be received just fine with the R820T.
    Also, the PLL could lock again at 1850 MHz to 1860 MHz, and the
    reception of a GSM 1800 BTS at 1854 MHz worked as well.
    Some initial comparisons [1] between the E4000 and R820T seem to hint
    at the R820T being a bit more sensitive, especially visible in the
    Tetra screenshots.
    Given that the supply of E4000-based sticks is dwindling, I'm pleased
    to see a tuner that has the potential of becoming a good
    replacement, and staying for a while on the market.

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