User`s manual

A2541R24x – User’s Manual Page 29 of 36
Release Date 11/22/13
Figure 9 Mounting the module in a corner
Figure 10 Mounting the module along an edge
“No GND” area is optional for A2541R24C modules. It may still be provided for compatibility with
the internal antenna version (A2541R24A).
3.5. Power Supply Considerations
Noise on the power supply line reduces the sensitivity of a receiver and can modulate onto a
transmitters signal, both of which causes a degradation of link quality and hence a reduction in
range.
The A2541R24A and A2541R24C modules have integral noise reduction from power supply to
the internal AVDD and DVDD pins, consisting of ferrite beads and decoupling capacitances.
This arrangement will take care of most supply voltage noise. For optimal performance in
particular noisy environments (switching regulators, motor controls, etc.) it may be necessary to
add additional noise reduction means, which can consist of a low noise LDO or additional LC
filtering.
Note that if operated from a battery source there is no need for additional noise reduction. Also
note that if the noise source can be synchronized to be off whenever the module is transmitting
or receiving then that will also suffice.