Digital and Analogue signals
Most modern wireless devices, such as mobile
phones, Wi-Fi devices and cordless phones, use a
digital system of communicating.
This means they turn the signal on and off at high
speeds to represent data, often with wide gaps
between data bursts. This produces a non-
continuous signal, which we describe as ‘pulsing’.
This means that when taking measurements in most
environments, you are likely to find that the left
peak (V/m) LEDs are higher up the scale than the
right PFD (µW/m
2
) LEDs.
A simple digital signal
The pulsing is almost always faster and more
complex than shown in the diagram, but the
principle is similar.
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