User Manual

11
A2: Noise level
What if my background noise is higher than -50 dBm?
An increased background noise is an indication of a higher interference level
picked up by the system. The noise level should be as low as possible, but as
long as the received signal from the transponders is at least 20 dBm higher then
the noise level detection will be reliable. If the noise level is higher than -70 dBm,
there is most likely something wrong with the installation.
Possible causes of high background noise levels:
When the detection loop is damaged, a uctuation in noise level will be •
noticeable, especially in wet conditions. If this is the case, please check
the loop wire and coaxial for cuts or breakage.
Electrical equipment too close (<3 m) to the loop or coaxial cable.•
Using a generator with a poor ground connection•
Use of DC/AC converter for AC power.•
Poor connections between the detection loop and the coaxial cable.•
BNC connector incorrectly tted to the coaxial cable•
Poor ground connection of the AC power. •
A3: Signal strength
What if the received signal strength is below -65 dBm?
If the signal strength is lower than -65 dBm, please check the position of •
the transponder.
If the signal strength is uctuating heavily in combination with high noise •
levels, check the qualityof the loop installation and coaxial cables.