I don't know how many of you will be able to view the videos -- they're Quicktime from my cellphone -- but I decided to put my Bel 715i in my car while my Whistler Pro-73 was operating today.
The videos show the results. Basically, when I plugged the Bel in but did NOT power it on, I got about 2-3 seconds of Ka band false alerts. In the second video, you can see me power on the Bel (which is on my dash), and the strength increases on the Whistler's Ka false. Still goes away after a few seconds, but it looks like a true Ka hit there for a second....the Whistler had auto-quieted at that point, but the strength went from 2 to 6.
OK...so I suck at the posting videos thing....