Wireless Interference and Repair

In this brief but informative article, I am going to summarize communication devices and radio interference.
I wrote this article because I was involved in the repair of a wireless microphone and wanted to organize the contents a bit.

By the way, in the past few years, the number of wireless devices has increased and I think there are many people now who use wireless earphones and other devices of this nature daily.
I myself cannot live without Wi-Fi and Bluetooth.

Anyway, what are Wi-Fi and Bluetooth? I looked it up and found...

■ Wi-Fi

When wireless LAN first came out, it was difficult to make strong connections between products and they had so many problems. So, it was standardized to solve this problem and is a communication technology that allows many devices to connect smoothly.
Through a Wi-Fi router, Wi-Fi-compatible smartphones, PCs, game consoles, and other devices use this network to connect to the internet.

■ Bluetooth

Bluetooth is the standard for short-range wireless communication digital devices. Bluetooth enables voice and data exchange between PCs, smartphones, earphones, and other devices.

Wi-Fi is used to connect devices to the Internet, while Bluetooth is used to exchange information between devices over a short distance.

The main issue to be aware of when using these devices is interference. The reason for interference is that both Wi-Fi and Bluetooth communicate through the 2.4GHz frequency band. Therefore, if there are a large number of devices connected or other devices communicating nearby, there is a risk that earphones will lose sound or the Wi-Fi connection speed will slow down. Microwave ovens, another familiar home appliance, generate 2.4GHz electromagnetic waves, which can also cause radio interference.
Similarly, wireless musical instruments and wireless microphones are also on the 2.4 GHz band.
To prevent interference, use wireless microphones that communicate through the B band (800 MHz band) and separate the bands.

As I mentioned at the beginning of this article, I would like to talk a little about an actual experience I had with a repair.

This story is about the repair of a wireless microphone (CLASSIC PRO CWR242).

The issues are:
The 2.4GHz Bluetooth device and the Wi-Fi Internet connection is interrupted when the microphone is paired with the receiver.
This was the case.

When I checked the operation near the Bluetooth device and Wi-Fi for in-house verification, the interruption occurred.

I thought that the CWR242 itself might be interfering with the 2.4GHz band, but when I replaced the board including the communication part of the microphone and receiver, the Wi-Fi interruption disappeared. I learned that an abnormality in the communication part can affect the other 2.4GHz band to this extent.

I also wear Bluetooth earphones or wireless headphones all day at home, but I am afraid of sound loss due to communication interference, so I use a wired LAN connection for my computer and a wired connection for my mouse and keyboard to prevent sound loss.

Recently, more and more practice guitar amps are becoming smaller and more multifunctional. For example, some guitar amps have a built-in receiver and the shield is a wireless transmitter, while others allow you to practice along with songs by connecting the amp to a smartphone via Bluetooth.

While wireless is lightweight, it is also susceptible to unseen influences, so it may help to keep interference in mind for comfortable use.

Finally, I would like to introduce some wireless equipment.
Thank you for reading.