AnsweredAssumed Answered

8596E shows high attenuation at band 1 but cal YTF does not

Question asked by deninnh on Aug 21, 2013
Latest reply on Aug 22, 2013 by deninnh
I recently acquired an 8596E which performs flawlessly in band 0.

At the band 1 transition, an additional loss of 27dB is seen.

I've fed in a source toggling between 2.9GHz and 3.0GHz which is in band 0 and 1.  The band 0 amplitude is spot on while the band 1 amplitude is 27dB down.  The same can be seen in the comb signal.

Here's the odd thing (lacking knowledge of the internal cal, however).  If I run the YTF cal, as each spur of the comb is used for the cal, the cal waveform shows NO drop as the frequency enters band 1.

How can this be?  Since the cal uses the actual analyzer input, wouldn't that rule out the SYTF or mixer as problems?

What would cause this huge attenuation to appear in actual use but not in cal.

The unit occasionally cannot complete YTF cal and most times fails mixer bias cal, no doubt due to this band 1 loss.

Thank you for any light you can shed on this problem.