Re: [Discuss-gnuradio] Merge multiple complex streams

[Mike Jameson]

If you make an FFT block for each rtl-sdr source you can then interleave them all together and take your pick using the 'M in N' block. At the edges of each rtl-sdr frequency it will probably get quite messy as the clocks are not synchronised.

An example of the use of the FFT and 'M in N' blocks is in my scanoo_rx app which will give you a head start.  The 'M in N' block is used to pick out the channel from the output of the FFT block:

https://raw.githubusercontent.com/m0mik/scanoo/master/apps/scanoo.com_rx.grc

I've always found that in order for it to work at first you must double click something in the flowgraph and then click cancel... some random erroneous bug in GRC.

Mike

On Mon, May 12, 2014 at 4:49 PM, Imre Biacsics <address@hidden> wrote:

Playing around with GRC for a few months now, sorry if this question is
from a dummy.

I've a bunch of rtl dongles laying around, and wonder if it's possible to
combine more then one to a single baseband signal.

The goal is to create a super cheap full HF band web reciever like or for
' websdr'

I managed to create multiple channels, where the 2nd dongle is tuned to an
offset, equal to the samplerate of the first. (for example 2 x 2 Msps = 4
Msps baseband)

Is such a thing possible with GRC?

Imre Biacsics





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