Hi Gordon,
When you change the span, other things in the analyzer change too. The resolution bandwidth and video bandwidth probably change at the 500kHz span setting as well. That means you can do another experiment:
Set the span to 500 kHz so you can see the spikes and then defeat the automatic coupling for the IF resolution bandwidth. Step the resolution bandwidth up and down and see if the spikes change as a function of res. bw. alone. Repeat for the video bandwidths.
Vladan
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--- In hp_agilent_equipment@..., "pianovt" wrote:
Hi Gordon,
This is almost certainly related to the way the LO is structured. Generally speaking, the LO has to make some changes as the span increases. In your case, for spans that are 500 kHz and larger, the LO uses a different method of generating the signal. I will look at the manual, but this may not be the easiest way to find a bad part, especially since you see the problem (to a lesser extent) in narrower spans as well.
Vladan
--- In hp_agilent_equipment@..., "gldinnc" wrote:
What I find curious, is that the spikes on the display only happen when the frequency span is 500,000 Hz or higher. Thoughts on this?
