Question

Hi,

On the FMB range of devices (eg FMB920) how does the Jamming Detection work (assuming in Features Settings - Jamming, it is not set to Disable)?

Does it actively detect the disruption of the GPS and\or GSM signal (most jammers just broadcast noise on the relevant frequencies)?

Or does it detect jamming when the GPS and\or GSM signals are zero? [This would not be jamming to me as there could be locations were there is no GSM\GPS signal.]

Thanks

Answer 1

Hi,

The jamming detection works by monitoring the GSM channels for broadcasted noise (i.e. a GSM jammer). It doesn't generate any jamming events when in bad reception areas.

Hope this helps

Comments

@rewofi - your answer certainly helps. Many thanks!

Answer 2

Hello.

Please read this Wiki page's Jamming section for more information: https://wiki.teltonika-gps.com/view/FMB920_Features_settings#Jamming

If you still have any questions, please ask.

Best Regards

Comments

Hi,

Thanks for your reply. I have read the Wiki page on Jamming and seen the video previously, but it is still a little unclear as to how the Teltonika units actually detect Jamming.

Do they detect jamming when:

1. The GSM signal goes to zero (which is what the video at https://www.youtube.com/watch?v=otQd34WqL54 suggests)?
2. Or when the unit detects the over powering noise on the GSM frequencies that the jammers outout?

The 1st scenario - false positives could occur if there naturally was no signal in a location (i.e. no coverage or very dense urban area). Whereas the 2nd scenario - would result in minimal false negatives.

Thanks