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Some very nice results have been reported with a new multichannel coherent SDR: https://www.crowdsupply.com/krakenrf/krakensdr

Haven't heard a lot of talk about this one yet, but the video at https://youtu.be/GZAbPsT3oRM?t=12 looks really promising.

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This is exactly the SDR I was trying out :)

Ah, good point, I commented without having RTFA. It's a really cool piece of hardware, no question about that.

It really is, has a super solid build quality too. Stumble around crowdsupply if you get a chance, tons of other projects just like this. My problem is stopping myself from funding more of them.

Looks great, ordered one. Couldn’t find any guide as to which frequency band to select from https://www.arrowantennas.com/arrowii/krsdr.html can anyone help? Is it best to choose based on local Digital TV bands? And is there any resonance changes in the array setup to factor in?

If you are doing passive radar, then a UHF/VHF TV antenna should cover you for whatever digital channel you choose

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