Here is the test setup. I didn't use BPF board because I haven't gone that far in writing the software to control this transceiver (now just a RX). Instead of the 425MHz reference generator for the DDS that I'm working with, I used 50MHz "can" oscillator. I had to use 8 X multiplier to access the whole HF.

It is obvious that several (few guite huge) spurs were visible on the screen. This will be of course history when the 425MHz reference generator is trimmed for maxmimum purity and can be used.

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