How A Wireless Doorbell Works

how a wireless doorbell works

Have you ever wanted to know how a wireless doorbell works?

In this article, I will explain to you what happens when you press the button on the receiver (push button), how it gets to the chime and what happens next.

Why You Need To Know How A Wireless Doorbell Works

Wireless doorbells, a wireless mouse/keyboard, in fact, most wireless electronic things work in a very similar way.

For most people, it is just a simple case of buying a product, putting the batteries in, connecting it up and leaving it to do its job.

Me though, I prefer to know how things work. In this case, a wireless doorbell. When you learn how something works, you can learn how to troubleshoot and fix any issues that you may have.

What Is A Hertz?

Hertz is a transmission frequency, in cycles per second, to measure the speed of wireless communications.

Commonly abbreviated to Hz, the measurement is named after Heinrich Hertz, a German scientist from the 19th century.

Hertz proved the existence of electromagnetic waves and the measurement is named in his honor.

Hz, Mhz, Ghz – What Are They?

1 Hertz is equal to 1 cycle per second, 1 Mhz (Megahertz) is equal to 1 million cycles per second and 1 Ghz (Gigahertz) is equal to 1 billion cycles per second.

You may recognize Hz from computer chip speed and radio frequency. It is a measurement that is used is a large number of fields and it is used by wireless doorbells to transmit a signal from the transmitter to the receiver.

How A Wireless Doorbell Works

When the button is pressed on your wireless doorbell transmitter, electrical energy travels through the antenna in the transmitter. This is the wireless doorbell antenna, and as the signal is pushed through that wire, electromagnetic waves from around that antenna and are sent out into the airspace.

The waves generated are able to travel a distance dictated by the strength of that energy.

The chime will be waiting to receive and understand that signal.

One the signal is picked up by the receiver, it initiates the chime and plays the sound you have picked.

The wireless signal being sent from the transmitter (push button) occupies a certain spectrum of frequency, which is the rate at which the signal vibrates.

Take a radio station, as an example:

FM radio operates at a very high signal, which vibrates around 100 million times per second. The radio station will have a very high powered transmitter, and your radio unit is the receiver.

As you tune into that signal, you are able to hear what the radio station is transmitting.

wireless doorbell is similar, although the transmission is sent at a different frequency, which is 433Mhz.

At 433 Mhz, the signal is vibrating at 433 Million times per second.

On the face of it, that sounds impossible, doesn’t it?

I wouldn’t want to be counting it, that’s for sure!

There are many wireless objects that use that frequency range, such as:

Indoor/outdoor temperature indicator with a remote transmitter

Central heating thermostat

Alarm sensor



Basically, almost any home security/home integration product is likely to be using the same frequency as a wireless doorbell.

Many Wireless Things Can Cause Interference

The problem is, the more wireless transmitters you have, the greater the potential to cause interference.

If you are having issues with your wireless doorbell then you will need to have a look around your house to see if there are any other devices using the same frequency.

The devices are not limited to only those above, there will be many devices utilizing this frequency.

Symptoms will include the wireless doorbell not working at all, only working intermittently, or the chime going off at random intervals when the push button is not being pressed!

The Workings Of A Wireless Doorbell – What Else Stops It Working?

There are some other things to bear in mind if you are having issues with your wireless doorbell.

The transmission becomes weaker when it needs to travel through other objects around your house.

These objects can be walls, doors, fridges, microwaves. Any big object will work against the signal being transmitted, making it weaker as it passes through each one.

Other electrical items weaken the signal more than nonelectrical items. Having said that, do not think that a wall is a nonelectrical item! It is likely to have power cables running through the middle of it, and they can have an impact on the strength of the signal.


Now you know how a wireless doorbell works, troubleshooting issues are easier.

When you are setting up your wireless doorbell, consider what you have read here to make sure you have a setup that works 100% of the time.


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