Re: [Discuss-gnuradio] How to use IQ Bal Optimize/Fix?

[kokosz]

Jeff, thank you for your tips. Actually I was testing it with another flowgraph and was in a rush to create this simple example, that's why I have fed original signal to these blocks. That's obvious mistake, thank you for pointing it out.

I have added sliders in order to change IQ imbalance generator settings in real-time as you suggested, and I can see that "IQ Balance Optimize" block is adjusting its settings. Unfortunately, the output signal is terribly deformed. I guess this is the case mentioned by Sylvain and Marcus, and this block cannot work with such signal. It is a pity. Nevertheless, I appreciate help of all of you.

Have a nice day!

Dnia 31 stycznia 2018 21:25 Marcus D. Leech <address@hidden> napisał(a):

On 01/31/2018 03:16 PM, Sylvain Munaut wrote:

Hi,

* You can just use 0.0 / 0.0 as the default. Those value are only

really used if you don't use the message system and just want a fixed

/ known manually set correction. Once the first message is received,

those value are overwritten

* As stated the time constant is in samples.

* The 'optimize' block only really works when you have some narrow

band signals distributed around the spectrums. It will fail

_miserably_ if you have a single wideband signal centered around DC

...

Cheers,

     Sylvain

Indeed, I find that if I use the osmocom IQ-balance code on radio

astronomy "signals" that it produces horrible results in interferometry

applications, as

 it never really "converges", and adds significant long-time-scale

phase-noise, so I disable it.

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