华商宝

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.

与此相结合（RTL2832+ R820T）在市场上是相对较新的。主要区别所有其他支持的调谐器，更远来看，它采用了低频（3.57 MHz）的架构，而不是

零中频。这意味着调谐器仅连接到同相ADC

输入，和内部的下变频器的RTL2832生成

复杂的样品。这样做的好处在频谱中间没有DC偏移量激增

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.

迄今为止，调谐器驱动程序，直接从内核驱动程序，

但不支持手动设定增益，虽然该功能似乎存在。

还有很多需要做的事情，最好的最

可能会是完全重写驱动程序，或至少清理方面

大幅上升。调谐器初始化需要的时间太长了

，因为驱动程序会产生大量的I2C通信，其中大部分是

是多余的，因为驱动产生太多冗余的I2C阻碍

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.

原来的驱动程序为40 MHz到900 MHz的频率限制，

但试验表明，可以实现我的电视卡达到PLL锁定到1766

MHz，而的确是又ADS-B在1090 MHz和1463 MHz的L波段DAB，GMR在1556 MHz的就好了，可以接收与R820T。

此外，PLL重新锁定在1850 MHz至1860 MHz之间，与

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.

一些初步的比较[1] E4000和R820T似乎暗示

R820T灵敏一点，尤其体现在

截图。

Given that the supply of E4000-based sticks is dwindling, I'm pleased

to see a new tuner that has the potential of ing a good

replacement, and staying for a while on the market.

由于E4000供应越来越少，我很高兴

看到了新的调谐器，有可能成为一个优秀的

替代品，并且市场上停留一段时间。

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