[软体无线电R820T+RTL2832U USB SDR ADS-B DVB-T DAB FM飞机追踪]
Вес товара: ~0.7 кг. Указан усредненный вес, который может отличаться от фактического. Не включен в цену, оплачивается при получении.
Описание товара
&[nbsp;软体无线电R820T+RTL2832U USB SDR ADS-B DVB-T DAB FM飞机追踪 ]
[亲：黑白2款颜色 没有指定随机发货]
[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[）。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]
[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，虽然该功能似乎存在。]
[还有很多需要做的事情，最]
[可能会是重写驱动程序，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，]
[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.]