Quick answer is I don't know. It 'should' go down to 10 kHz but as you say when I reviewed it I didn't check its LF performance. My review of the Colibri is still on the sunsdr.eu/product/colibriddc/ website. There is a Radio User review there as well and they say it can be used at 380 kHz but they don't say anything about lower than that.
The RSP2 should go just as low as the Colibri, but you will need a low pass filter to get rid of the AM broadcast band for either receiver.Post is under moderationStream item published successfully. Item will now be visible on your stream.