On Tue, 20 Apr 2021 08:21:07 -0700, you wrote:
I was never successful getting CAT to work while portable. I discivered, when I returned home, that it would work correctly only with the laptop power cable plugged in. I checked all the buried power saving settings regarding USB power saving, and they are all appropriately disabled, including the USB root hub settings.
Does the laptop have a VGA or any other connector with screws on it.
From there route a cable to the transceiver metal case,
thus connecting laptop ground with rig ground.
maybe that helps.