Improving Image Rejection on gnuradio with osmosdr block.

xtrx-sdr / images

Pre-built XTRX packages and firmware images

https://www.crowdsupply.com/fairwaves/xtrx

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Improving Image Rejection on gnuradio with osmosdr block. #19

Open transcendent12 opened 6 years ago

transcendent12 commented 6 years ago

At the moment using the osmocom block and observing the output on gr-fosphor, I'm noticing very strong image signals. I've tried tuning parameters such as gain, bandwidth and implementing the IQ balancers from gr-iqbal and CORRECTIQ. At worst, the image is as strong as the real signal, and at best I can get 30dB image rejection. Are there any other key methods I need to implement to improve the image rejection performance?

image_reject

transcendent12 commented 6 years ago

Also, automatic band selection doesn't seem to kick in until you tune to another frequency. Manual selection e.g. LNAL/W/H does work on flowgraph start. Putting AUTO didn't seem to work? Is the command something different?