# Re: Merge multiple complex streams\]

**URL:** <https://www.ruby-forum.com/t/re-merge-multiple-complex-streams/241118>\
**Category:** GNU Radio\
**Created:** [May 13, 2014, 1:16pm UTC](https://www.ruby-forum.com/t/re-merge-multiple-complex-streams/241118 "2014-05-13T13:16:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [May 13, 2014, 1:16pm UTC](https://www.ruby-forum.com/t/re-merge-multiple-complex-streams/241118/1 "2014-05-13T13:16:58Z")

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Thanks a lot, it really got me going! This is part of my learning  
process,  
if it’s leading to nothing at all; that’s okay.

Somewhere I red about feeding multiple dongles from a single signal  
source, interesting…

A possible configuration:

1. Upconverter & 30 Mhz low pass filter
2. Cheap wideband amplifier / splitter ( 75 Ohm tv splitter ?)
3. Rig dongles with usb hubs

I fiddled around with Mike’s example had a hard time to figure out the  
way  
to merge the FFT outputs. Found the solution in the ‘Streams to Vector  
block’ Setting the vector length to the FFT size.

Result: [http://www.livep2000.nl/code/grc/](http://www.livep2000.nl/code/grc/)

Let’s test the frequency border(s)