产品描述
軟體無線電R820T+RTL2832U USB SDR ADS-B DVB-T DAB FM飛機追蹤
親：黑白2款顏色 沒有指定隨機發貨
Sticks with this combination (RTL2832 + R820T) are relatively new 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.
與此相結合（RTL2832+ R820T）。主要區別所有其他支持的調諧器，更遠來看，它采用了低頻（3.57 MHz）的架構，而不是
零中頻。這意味著調諧器僅連接到同相ADC
輸入，和內部的下變頻器的RTL2832生成
復雜的樣品。這樣做的好處在頻譜中間沒有DC偏移量
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.
迄今為止，調諧器驅動程序，直接從內核驅動程序，
但不支持手動設定，雖然該功能似乎存在。
還有很多需要做的事情，最
可能會是重寫驅動程序，或至少清理方面
大幅上升。調諧器初始化需要的時間太長了
，因為驅動程序會產生大量的I2C通信，其中大部分是
是多余的，因為驅動產生太多冗余的I2C阻礙
The driver originally 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.
原來的驅動程序為40 MHz到900 MHz的頻率限制，
但試驗表明，可以實現我的電視卡達到PLL鎖定到1766
MHz，而的確是又ADS-B在1090 MHz和1463 MHz的L波段DAB，GMR在1556 MHz的就好了，可以接收與R820T。
此外，PLL重新鎖定在1850 MHz至1860 MHz之間，與
接收的工作，以及在1854兆赫的GSM 1800 BTS。
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.
一些初步的比較[1] E4000和R820T似乎暗示
R820T靈敏一點，
Given that the supply of E4000-based sticks is dwindling, I'm pleased
to see a new tuner that has the potential of becoming a good
replacement, and staying for a while on the market.
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