Re: My frequency spectrum is being shown inverted. Why?


Simon Brown
 

Hi,

 

It’s applied to the returned samples before they are sent to the FFT / demodulation. It’s independent of the per-radio DLLs. It’s simply swapping I and Q. Also there’s another radio ( I forget which) which returns QI[0] QI[1] QIQ[2]… rather than IQ[0] IQ[1] IQ[2]…

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: 13 December 2020 13:31
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] My frequency spectrum is being shown inverted. Why?

 

Is this a message sent to the Source...dll or is it done inside the main program? I'll have to experiment more.

{^_^}

On 20201213 05:28:39, Simon Brown wrote:

Well it works, that’s all I can say – tested myself.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: 13 December 2020 13:25
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] My frequency spectrum is being shown inverted. Why?

 

See the forum - that is what I did. I posted it as a bug there.

I expect the center frequency to remain constant and the displayed signals to flip from one side to the other. I did not see that, which rather surprised me.

{^_^}


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