GW Instek GRF-1300A - Manual (Page 91)

RF Communication and Signals Experiments
Experiment
principles In this experiment we will use a 2.4G wireless mouse. It
uses the so-called 2.4G frequency band. The advantage of the
2.4G band over the 27MHz band is that the 27MHz band has a
shorter transmission distance and is prone to interference from
other devices. We call it 2.4G because it operates in the 2.4GHz
frequency band. In most countries, this frequency band is
license-free.
The principle of the wireless mouse is actually very simple.
It mainly uses digital radio technology to provide adequate
bandwidth for communications equipment over a short
distance. It is ideal for peripheral equipment such as mice and
keyboards. The working principles behind a wireless mouse and
that of a traditional mouse are the same. The only difference is
that the X & Y position, as well each button press is transmitted
wirelessly via a transmitter. The wireless receiver then passes
this information to the host after decoding the signal. The driver
then tells the operating system to convert the signal to mouse
actions.
Experiment
contents Measure the frequency and power of the signal that is
transmitted from a wireless mouse.
Experiment
steps 1. Connect the antenna to the input port of the spectrum
analyzer.
2. Set up the GSP-730 as follows:
• Center frequency: 2.4GHz
• Span: 200MHz
• Reference level: -20dBm
• RBW: Auto
Step1
F1 4
Step2
F1 2 0
Step3
F1 2
Step4 BW
F1
3. Turn the wireless mouse on.
Step5
Step6
Peak
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