n6gn

How about a spectrum instead, there's information in that display that is hard to see in the waterfall.

I think this is correct, that's how I generated these spots, by running on a moderately capable desktop. Judging from the relative performance of the KiwiSDR WSPR extension and other systems, I think asking an FT8 extension on the KiwiSDR to keep up with a band like 40m is lately is probably not realistic. I posted this in response the "Doable on the Kiwi?" question at the top of this thread. I suspect it really isn't....
Glenn n6gn

This article is intended to document some of our recent experiences using a KiwiSDR on WSPR and observed degradations of those spots when compared with other receiving and decoding techniques. Three techniques are examined: complete decode of WSPR stations by way of the KiwiSDR WSPR extension, use of the KiwiSDR to downconvert to an audio file which is decoded by a remote host, and for contrast a non-KiwiSDR path using an Apache Angelia SDR board. These comparisons show degradations in the two KiwiSDR paths both in terms of SNR of spotted stations and in number of stations spotted. Additionally these investigations have identified spurious signals associated with the downconversion process within the KiwiSDR.

[download article PDF below]

This article is intended to document some of our recent experiences using a KiwiSDR on WSPR and observed degradations of those spots when compared with other receiving and decoding techniques. Three techniques are examined: complete decode of WSPR stations by way of the KiwiSDR WSPR extension, use of the KiwiSDR to downconvert to an audio file which is decoded by a remote host, and for contrast a non-KiwiSDR path using an Apache Angelia SDR board. These comparisons show degradations in the two KiwiSDR paths both in terms of SNR of spotted stations and in number of stations spotted. Additionally these investigations have identified spurious signals associated with the downconversion process within the KiwiSDR.

[download article PDF below]

I recently received a KiwiSDR from Mass Drop and made some measurements of distortion and noise of the unit. These measurements and their results are detailed in the attached file.

Glenn n6gn