Kraken SDR

[JERRY TAYLOR]

Has anyone tried using a Kraken SDR for a RA application? Interferometry?

[Marcus D. Leech]

On 2026-06-17 13:47, JERRY TAYLOR wrote:

Has anyone tried using a Kraken SDR for a RA application? Interferometry? -- 

It should theoretically work.   It has been on my list of things to try for a few years now.  Too many other projects.....

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[Mike Otte]

Look back in forum  -    https://groups.google.com/g/sara-list/c/ZFJEfZeGEPY/m/AH4gRex0AgAJ

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Mike Otte W9YS

[Robert Meade]

The Kraken GNU radio block as defined I found to be suboptimal for radio astronomy. I had to make some modifications to get it to not be dropping samples and maintain timing alignment for IQ collection based on starting timestamp. I have some solar transit data for interferometry that I still need to try processing, but haven't quite done that as of yet. In principle, it should work quite well. I'll probably post on the list when I get some results.

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[Randall Wayth]

A few years ago I had a student build an interferometer from a Kraken. It did work, but it was fiddly.

I don't have the code he used, only his reports, but from memory he did not use a high-level gnuradio block, but rather he modified some of the publicly available code that sets up a streaming correlation system with ring buffers, pipes and such. In the end, wranging the plumbing and synchronisation system was a bridge too far for his experience level, and we only got some basic results testing with a local transmitter. But it was clear from his results that it would work as an interferometer. We also did not have LNAs on the receiving antennas or other details that need to be considered for a radio astronomy application.

So I think this can be done, but it will take some expertise with unix plumbing to pull it together. If people are interested, I can try to dig up the details.

Randall.