Did do a calibration right after the upgrade and save it to position 0 (zero). It shows the problem with or without a calibration.
Eventually figured it out and got it working. Apparently the new Aug 2 firmware does not actually change the frequency limit. It just leaves it at what is was (800 or 900 MHz)
The only firmware that seems to be able to actually change the 900 MHz limit to 800 MHz is the older June 22 firmware (nanoVNA_800_aa_20190722.dfu)
Once the older software sets the limit to 800 MHz, the new Aug 2 firmware ch with change it to 4 channels and leaves it at 800 MHz.
The new Aug 2 firmware ch also leaves the user area in a state of disarray such that it will actually crash. It was the phase display that was causing all the spikes. Finally managed to get the user area set up from the front panel. It is working great now on 800 MHz 4 channel.
Thanks for all you help,
Jim K.
