>I attach my "worst case difference" screen captures. One is blackham >harris operating on a pure tone. The other is polyphase operating on >exactly the same tone. I presume you can see the difference here.
Certainly can - most impressive. To demonstrate this for myself I used an Elecraft XG1 on the 50uV range and the 100hz filter - the result using Spectrum, and even more so with Waterfall is really dramatic. The problem I was having previously was trying to find an steady (and clean) enough on air carrier to do the test. Trevor G0KTN
