I've been annoying Escort through emails trying to learn the exact logic of autolearn. They won't disclose alot of details but I thought I would share what I have discovered.
1) "The auto learn needs to see the same signal three times in the same place before it locks it out. If the signal changes because the source has gone out of calibration, or if there is another signal present, it won't lock it out, to prevent the chance of locking out a genuine police signal. It does not block out all bands in a location."
Looking at that quote it looks perfect. It blocks a signal, if it sees a second signal on the same band it alerts, regardless of frequency. If the cop was using the same frequency as the door his readings would be inaccurate. Yet they would not answer directly if the detector would alert to the added signal. They said it would not be stored in memory but I'm assuming that also means the warning will happen.
2) I asked the question why I can drive by an autolearned location with the signal source off and when it comes back the next day it instantly blocks it. This was the response.
"It will delete an autolearned location if there is none there; but if it comes back, it will remember it."
This is what scares me. Say you pass the same cop, same spot and same frequency 3 times in a row. Autolearn would naturally lock that signal out. The next time he is not there. Autolearn deletes that location but still keeps it on 2 of 3 strikes. If it sees the signal again, it will instantly without a "Stored" warning, filter the signal. I know this situation is extremely unlikely but it can exist.
I'm not a engineer but I think the logic of autolearn would be fairly simple to implement. The detector has the ability to determine the exact frequency, so if it sees that exact frequency 3 times it blocks it in the logged location. The only problem I see dependent on how accurate the detector is. If it estimates the signal, or only view it in the 30mhz blocks this could be why the false lockouts are happening.
I just thought I would share this information to help more people decide if autolearn is right for their situation. For now I'm keeping it on but leaving the detector in expert mode for the multiple signals alert. I do not use the manual lockout function.
Feel free to correct me if anything is inaccurate.