Hi Bob,
I am working on my own RYTHM with some success.
Can you do the following:
Insert CW at 4GHz, -20dBm.
Apply the following settings on E4407B:
Center freq 4GHz
Span 250MHz
Resolution BW 1MHz, Video BW 1MHz
Preselector Center: Front Panel Access: AMPLITUDE/Y Scale, Presel Center
Do you get a peak of reasonable amplitude at 4GHz after this?
If you do, then your YTF polynomial might be off. I am working on a procedure for this.
Best regards
