Архив за 02.03.2019

Another signal ID (sorry but they have been unusual)

submitted by /u/pussycrushingsoyboy
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Help: Miniwhip setup

Hey so I have one of the RA0SMS miniwhips. I've currently got it tied about 15-20 feet up in a tree. The antenna then has a 50 ft coax cable running from the tree (nearest tall object) going into my house. It then attaches to the power feed unit which is powered by a 9v battery and has a ground running about 10ish feet to a groundstake outside the window. When I turned it on there are a ton of peaks throughout the whole spectrum. Almost each peak, at least the stronger ones, sounds like it has more than 1 station coming through. Is this caused by the coax also acting as an antenna? if so, how do I stop it?

submitted by /u/morehambones
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User Projects • Re: IQ to frequency spectrum with FFT — half of bandwidth?

Thank you hotpow2!
I finally got a full spectrum with you advices!

In my first post i wrote the totally untruth.
As you say: i need fftshift to properly reorder FFT result array, here is visualisation for your words:
Figure 5: https://www.gaussianwaves.com/2015/11/i ... -fftshift/

Here was my mistake, and fftshift resolved the problem. I will digg into other topics you mentioned.
Thank you very much!

Statistics: Posted by MrMarian — Sat Mar 02, 2019 9:03 pm


Comment on RTL-SDR Tutorial: Decoding Inmarsat STD-C EGC Messages by Ronby

Thank you. I will try I have a nooelec LNA. What must the QUAL be to start decoding

Signal ID?

Signal ID? submitted by /u/pussycrushingsoyboy
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Just built a QFH antenna, went ouside, received a perfect signal…. And forgot to press „record“ in GQRX.

Just built a QFH antenna, went ouside, received a perfect signal.... And forgot to press „record“ in GQRX. submitted by /u/bigtomatom
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What are your thoughts on Per Vices

Pervices.com

I’ve started seeing Per Vices adds this past week for their new product “Cyan”... a crazy expensive software defined radio that has up to 8x8 phase coherent change with 1ghz bandwidth operating up to 18ghz.

Their only other listed product is Crimson which is a 4x4 325Mhz BW 0-6Ghz for a more reasonable (but still expensive) cost.

Anyone have any experience with these guys?

submitted by /u/atleast3db
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User Projects • Re: IQ to frequency spectrum with FFT — half of bandwidth?

Make sure you are sending both I and Q channels to a single complex-to-complex FFT.
Use N samples of I and N samples of Q to create N complex samples for a length N FFT.
Don't use 2 real-only FFTs or a complex FFT with all the imaginary components zero, instead of Q data.
(Read up on complex numbers, complex multiplication, and Euler's identity, if needed).

For a length N complex FFT with the RTL-SDR set to a frequency of f0 and sample rate of sr :
you should see spectrum from f0 to f0+(sr/2) in FFT complex result bins from 0 to N/2,
and spectrum from f0-(sr/2) to almost f0 in complex result bins from N/2 to N-1.
If the imaginary components of the FFT input are not zero, then the FFT results should not be complex conjugate mirrored.

Make sure to take the magnitude (abs) of the complex results to view spectral power.
For ease of visualizing the FFT results, I usually do an fftshift after the FFT,
which rotates the data to center f0 at bin N/2.

Statistics: Posted by hotpaw2 — Sat Mar 02, 2019 4:46 pm


Help, my esd diode burnt, need the model to replace, it’s a NooElec

Help, my esd diode burnt, need the model to replace, it's a NooElec submitted by /u/Jason_Malik
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Comment on SDRSharp Users Guide by C7sky

How do I save signal data as a file using SDRSharp?

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