"A similar plot could be done showing the spectrum analyzer accuracy difference data."

Please do.

If you update your chart, correct the G2 2024>1.8Mhz>No Jumper data point appears to have been transcribed as -55.9, it should be -55.0

Hi Paul:

I understand that Thetis was originally written as a Spectrum Analyzer, project code name Cyclops.

If you look at the G2#2 data with jumper removed, the Thetis DUP display agrees with the external S/A to w/in 1dB everywhere except 12m, 1.7dB. That's actually w/in the absolute power level ...

EDIT: 05 FEB 2025
Good catch Scott, thank you. Yes, the X-Y scatter plots are created and formatted manually, which is tedious, so duplicating just required the arrays to be cut-and-paste for the 2nd radio's data, which was interrupted with a call. That file has been corrected and the Summary PDF ...

Regarding isolation of RL-2, since we can see from the initial dataset the effect is both frequency and power dependant, higher bands needed to be tested.

Shown in the attached summary chart, replacing the RL-2 jumper with a 30dB step attenuator demonstrates that ≥90dB of isolation is required to ...

Hi René:

Thank you for your post. You asked "How did you rule out that you are not measuring the IMD of the Rigol?"

That is a very good question. First, We applied the measurement principles taught in the Rhode & Schwartz white paper on IMD measurements, here:

https://www.rohde-schwarz.com/us ...

In an effort to keep my original post on track, I'd like to reiterate:

The summary points of the presentation are:

You can achieve even better IMD performance with PureSignal with the XVTR Jumper removed:

1. The Thetis Panadapter display (DUP Mode) and an external S/A now agree to w/in 1dB on ...

Thanks Scott: Re>. 'You went through far, far too much work...'

Any thorough analysis requires more than a single data point, and thus we now have sufficient data to explore and use, at least for these three models. Having that data show trends that otherwise might not be apparent.

Your comments ...

IMD SUMMARY 7000DLE MKII K1VF_Rev13.zip Want up to 10 dB lower IMD when using PureSignal? Read on!

PureSignal operates by using feedback from the PA output to calculate the gain and phase characteristics of the PA. Then, the input to the PA is ’pre-distorted’ to compensate for the PA’s gain and ...