On Wed, Apr 12, 2023 at 09:46 AM, Ed Wilson wrote:
Here is the measurement comparison table for one Ultra driving the other and vice versa (pretty close):
Ed,
? ?Your measurements are in-line with Erik's design goals, and I wouldn't mess with the calibration tables unless you have a calibrated RF sine-wave generator that you trust.? Kurt had access to a microwave sinewave generator that most labs would die for when he generated the input correction tables. The accuracy of the Ultra's corrected measurements, when tested against a number of other RF generators owned by other beta testers, i still amazes me at what a wonderful job he did.
? I looked up the data on the Q5 Signal synthesizer and it appears to be pretty much the MAX2870 evaluation board without any additional firmware for level correction.? The mystery continues as to why your two Ultras measure the output of the Q5 synthesizer differently above 1GHz, but I strongly suspect that if you were measuring the output of a calibrated RF sinewave generator the deviation for both Ultras would be in-line with Erik's design goals.
Herb
