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多个RTLSDR的玩法 [复制链接]

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离线BG4DRL
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只看该作者 40楼 发表于: 2014-04-09
说反了   还好 还好
- Day After Day -
离线BA5DX
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只看该作者 41楼 发表于: 2014-04-10
K3中频出来直接进2832没反应,必须开前置,然后只好加了个MC1350试试,40dB
离线BA5DX
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只看该作者 42楼 发表于: 2014-04-10
请教下skimmer server具体怎么与sdr对上号?
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只看该作者 43楼 发表于: 2014-04-10
skimmer servers是针对QS1R专用设计,7Band接收,好像USRP可以4Band,网站有USRP的驱动。
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只看该作者 44楼 发表于: 2014-04-10
额 4楼不是用SKIMMER SERVER配合N个rtl2832  接收多个波段么?
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只看该作者 45楼 发表于: 2014-04-10
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BA5DX:额 4楼不是用SKIMMER SERVER配合N个rtl2832  接收多个波段么? (2014-04-10 15:01) 

他是用5楼的软件支持4个RTL,用6楼的软件支持7个RTL,这都需要一个作者自己开发的模拟程序的支持。这个程序是RTL-HPSDR。
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只看该作者 46楼 发表于: 2014-04-10
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BA5DX:K3中频出来直接进2832没反应,必须开前置,然后只好加了个MC1350试试,40dB (2014-04-10 10:17) 

40db有点大吧?我用20db前置接天线,中频输出应该不小于0dbm,比天线接收的信号强多了。
[ 此帖被BG0APD在2014-04-10 18:35重新编辑 ]
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只看该作者 47楼 发表于: 2014-04-10
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BG0APD:他是用5楼的软件支持4个RTL,用6楼的软件支持7个RTL,这都需要一个作者自己开发的模拟程序的支持。这个程序是RTL-HPSDR。 (2014-04-10 18:26) 

看上去很复杂 绕了n个弯诶
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只看该作者 48楼 发表于: 2014-04-10
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BG0APD:40db有点大吧?我用20db前置接天线,中频输出应该不小于0dbm,比天线接收的信号强多了。 (2014-04-10 18:27) 

没找到K3中频输出的资料,用901H测量了下要比天线电平低很多。
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只看该作者 49楼 发表于: 2014-04-13
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只看该作者 50楼 发表于: 2014-04-13
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只看该作者 51楼 发表于: 2014-04-13
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只看该作者 52楼 发表于: 2014-04-13
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只看该作者 53楼 发表于: 2014-04-13
积木先搭到这里,事多,有空再玩。
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只看该作者 54楼 发表于: 2014-04-13
转帖,Using Multiple RTL2832U Sticks for SDR

介绍
由于RTL2832U棒是如此便宜,为什么在一个停下来?我以前从未见过这样提到的任何地方,但你确实可以使用几个RTL2832U同时坚持。显然,与SDR#和第三方ExtIO.dll为HDSDR使用的ExtIO.dll文件将允许您从插入PC几个RTL2832U棒可用于通过SDR软件选择。所以,换句话说,你可以开始SDR#或HDSDR的多个实例,并选择个别RTL2832U每个正在运行的程序将使用。例如,您可以运行SDR#或HDSDR的三个副本与每一个使用一个单独的棒接收不同的频段。有多少RTL2832U接收器可以同时运行?我不知道是肯定的。它可能会回落到多少USB端口有可用和您的计算机的处理能力。我有一个2.4GHz的双核机器上运行三个电视棒在SDR#或HDSDR上面没有问题。我能同时运行多个多个非SDR应用,因此采用这种非常温和的机器,即使有大量的开销存在。

http://www.hamradioscience.com/using-multiple-rtl2832u-sticks-for-sdr/
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只看该作者 55楼 发表于: 2014-04-13
视频,SDRSharp + Newsky RTL2832U, Multiple dongle instances (Three simultaneous) - YouTube

http://www.youtube.com/watch?v=5ThrDLruJA8
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只看该作者 56楼 发表于: 2014-04-13
KA1RA也玩多个RTLSDR,并且考虑了多个RTLSDR的时钟同步问题,在此转发一下,共同学习。

I have been playing around with the cool RTL dongles (more on rtl-sdr dongles on superkuh's web page or rtl-sdr.com) that you can buy on e-bay for about US$8 (including shipping). These are very capable 8-bit digital receivers that have up to 2.4 MHz bandwidth and can tune anywhere between 24 MHz and 1850 MHz.

I recently came up with a trivial hack to build a receiver with multiple coherent channels using the RTL dongles. I do this basically by unsoldering the quartz clock on the slave units and cable the clock from the master RTL dongle to the input of the buffer amplifier (Xtal_in) in the slave units (I've attached some pictures).

I originally drove the master crystal with both dongles, which also worked. However, Ian Buckley pointed out to me that a more typical way of doing this is feeding the signal into Xtal_In (in the pictures below). So I tried that too, and it also worked. I'm still not sure what the optimal setup is, as there is no schema for the dongle, but both methods I've tried so far have worked in practice.
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只看该作者 57楼 发表于: 2014-04-13

This is how you make a dual coherent channel digital receiver with $16.  The clock drive probably won't be enough for many of these, but this can be fixed with a buffer or some other active splitter.
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只看该作者 58楼 发表于: 2014-04-13

The oscillator is wired using a piece of 75 Ohm antenna coax that came with the dongle. It's like they designed the dongle for  multi-channel coherent applications.
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只看该作者 59楼 发表于: 2014-04-13
This has some implications for low cost geophysical instruments. It will be possible to use this receiver for the 150/400 MHz beacon satellite receiver, as this only requires that the receivers have clocks that are locked with each other. Interferometry and passive radar are other application examples. With more than two locked channels, applications such as imaging start to become possible.

I've made some relative phase noise measurements, and the systems don't have detectable sample drift over two hours, and their relative phase is also pretty stable.
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