I just had an incident that demonstrates the difficulty of seperating two fq's that are close together.
I picked up a K-band LEO from way out and drove past him as he had just finished writing a ticket and sat alone on the other side of the road with his lights on. (doing paperwork, I guess)
The arrows worked and did the front-side-rear bit and the rear horn "held on" to the signal until I was well out of sight. A few minutes later my V1 alerts to weak K-band from the rear. I check the rearview, and see the LEO come into view from around the corner, about 1/2 mile behind me. As he turns toward me the V1 goes nuts and sits on, or close to, a full alert.
The LEO just stayed back there, broadcasting and cruising for many miles until we started to get into town. As we neared a known K-band false, I expected the V1 to alert to a second bogey and point ahead (and behind too, because the LEO was still back there.)
The V1's arrows flipped from rear to side and back a few times, but the bogey counter stayed on 1, and V1 never alerted to the door opener. (I went back without the LEO and the V1 alerted just as it always has.)
I am almost sure the LEO's signal and the door opener's signal were right on top of each other fq-wise.
With the LEO behind me I'm sure the V1 was picking up his signal in both horns, but knew that the strongest signal was coming from the rear and kept pointing in that direction. When we neared the door opener, the signal coming into the front horn apparently looked just like the reflected signals from the LEO behind me, and the V1 did little more than an arrow "dance".
This is why I don't think TrueLock is "broken". (My ix has locked out two LEO's)
When two signals are too close together fq-wise, they are received as one signal.