AM CROSSPOINT – bombaster.

AM CROSSPOINT systems appeared on our radar back in 2012. At first, there were very few of them, and they seemed more like a strange technical marvel than a problem.
Over time, their numbers increased, and they turned out to be completely impenetrable to regular jammers or to any existing jammers at that time.
In 2015, we finally found where to buy these AM systems and began our first attempts to do something with them.
At first, it seemed completely unrealistic — the system has a fairly sophisticated noise adaptation system in a digital analytical implementation.

What does it mean?
– The system, analyzing noise differences, rest state, and sensor information, determines what needs to be done:

1. silence;
2. do nothing and repeat the action selection procedure;
3. alarm;
4. adapt to the noise.

*options 3 and 4 are always accompanied by sound.

Option 3 is when the system detects a sensor and triggers an alarm, and option 4 is when the gates see something wrong and switch from one method of analysis to another.

What did we do…?
– As far as possible, we calculated the mathematical formulas for decision-making by the gates themselves, so that option 2 would happen in a closed loop:

do nothing and repeat the action selection procedure;
do nothing and repeat the action selection procedure;
do nothing and repeat the action selection procedure;
do nothing and repeat the action selection procedure;
and so on.

However, there were and still are nuances to this solution for simple reasons.
A jammer is only one source of signal (figuratively speaking, a point), but there are usually two or more gates, and each of them listens to what’s happening itself:
– there is a constant change in the signal level from one point, and when we move, we substantially and differently affect the gates for a certain amount of time (which is always different), triggering the adaptation process in one or both gates simultaneously.

Therefore, a bunch of nuances and rules with AM CROSSPOINT:

1. Do not approach the store from the corner, as the gate closer to you “hears” the jammer more than the farther one, leading to differences in calculations and adaptation.
2. Enter the store from a distance of at least 2-3 meters straight, as if you were walking through a tunnel with gates on either side.
3. After entering the store, it is not recommended to immediately turn right or left, as adaptation to the difference in calculations will occur. Move deeper into the store by 2-3 meters.
4. Do not rotate with the jammer near the gates, as the jammer’s field has two poles, and a rotating jammer will provoke adaptation.
5. When passing through the CROSSPOINT, the most stable jammer position is if it is in your hand or side pocket and is positioned parallel to the plane of the gates. This means that the antenna inside the jammer is wound in approximately the same way as in the gate. Just look at the gate and hold the jammer the same way. This will allow for a more stable signal without strong fluctuations.

There are also some successful examples of application:

📌 If you have a partner or are working in a team, the person with the jammer can approach the gates and, from a short distance, turn on the jammer with the pre-selected mode #4. After this, your colleagues can pass through the gates with minimal chance of triggering an alarm or adaptation, as the jammer does not move and transmits a stable signal to the gates.
📌 If you are working alone, in some cases, the “short-term impact” tactic on the gates has helped. You approach the gates at 1-1.5 meters, turn on the jammer with the pre-selected mode #4, pass through the gates, and after 1-1.5 meters, turn off the jammer. The adaptation algorithm may not necessarily perceive this situation as noise, and there will be no sound signal because the impact is short-term.

This information-rich text was written because of the certain difficulties faced by novice users in some cases of application with AM CROSSPOINT. However, mode #4 in many cases provides a normal stable result, which we achieved through several stages over about 6 years. Mode #4 has undergone many essential changes and minor improvements, and we objectively believe that at this moment, this method has been perfected within the current technical capabilities of the jammer’s electronics.

The best advice from us and other users: first, practice and reconnoiter with AM CROSSPOINT and sensors in your pocket exactly where you do not need to work, and only then proceed to the real deal!