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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] How to use IQ Bal Optimize/Fix? |
Date: | Wed, 31 Jan 2018 15:24:13 -0500 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
On 01/31/2018 03:16 PM, Sylvain Munaut wrote:
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.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
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