Embedded Files
What is radio transmission?
What is radio transmission?
Transmission solutions essentially send information from one place to another via radio waves. This is a type of wireless communication – so-called because, of course, it doesn’t require physical wires. Other types of common radio transmission include radio and television broadcasting and walkie-talkies.
There are two essential components in any radio transmission solution: a transmitter and a receiver. The transmitter is the component which generates and sends the signal, while the receiver is the component which picks up the signal and displays or utilises the information contained within it.
What does radio frequency mean?
What does radio frequency mean?
The frequency of a sine wave is how quickly or slowly the wave oscillates from top to bottom in one complete cycle. It is measured in cycles per second. This measure is also known as hertz.
The place you are most likely to have come across frequency measures is on a radio. The numbers that identify the channel you are listening to (for example, BBC Radio 1 is 97-99 FM) refer to the frequency band over which those channels transmit. Tuning your radio to 99 FM means that the radio transmitter is generating a sine wave at 99,000,000 hertz (cycles per second).
What is encrypted radio transmission?
What is encrypted radio transmission?
In its basic form, radio transmission is not very secure. Devices exist which can interrupt the signal mid-transmission and allow hackers to gain access to the information being sent. However, there are now multiple methods for encrypting the information to ensure that it cannot be stolen.
One of those methods is KeeLoq® rolling code. This method is intended to prevent hackers from intercepting signals used in access control systems. By constantly changing the ‘password’ required to gain access (on a rolling basis), even if it is intercepted, by the time the hacker tries to use the password they have stolen, it has already changed.
Receivers: How to choose the right receiver
Receivers: How to choose the right receiver
There are several key features that distinguish different types of radio receivers and whether they are suitable for different projects.
There are several key features that distinguish different types of radio receivers and whether they are suitable for different projects.
Number of relays
A relay is a switch that opens or closes a circuit. In transmission, when a valid transmission signal is picked up by the receiver, it triggers a relay to change from open to closed or from closed to open. This change in state in the circuit is what controls the action – a light turning on, a door unlocking, or a gate automatically opening. If a receiver is equipped with more than one relay, it can control more than one circuit.
Memory capacity
This refers to the number of different transmitters that the receiver has space to accommodate.
Modulation type
Modulation is the process of encoding the message into the sine wave that is transmitted. Demodulation is the reverse: separating out the original message from the transmitted sine wave. Common methods are AM and ASK. As long as both the transmitter and receiver use the same type, the message will be successfully transmitted.
Frequency
The frequency of the transmitter must be the same as the frequency of the receiver. This ensures that the sine waves are being sent to and from the intended components. Most CDVI transmission solutions run at 433.92MHz.
Encoding method
Power supply
Transmitters and receivers require a power supply to function. This might be a wired power supply or a battery. It is important to ensure you have the right version of the product with a power requirement that matches the rest of your system.
IP rating
If your components are to be installed outdoors or exposed to the elements, you should look for IP ratings. These measure the product’s resistance to the ingress of solids and liquids that might affect performance. The highest possible IP rating is IP68.
Transmitters
CDVI's range of innovative transmitters are well-suited to a wide variety of installation contexts. From residential properties to industrial premises, commercial buildings, and high security facilities, transmitters are an important part of the automation ecosystem. Simple to install and intuitive to use, CDVI transmitters are designed to make life easier for installers and end users alike. Now with AES128-bit high security options benefitting from KeeLoqⓇ rolling code algorithms, these transmitters are ideal for your projects.
Touchless transmitters:
Touchless transmitters:
CDVI's range of innovative transmitters are well-suited to a wide variety of installation contexts. From residential properties to industrial premises, commercial buildings, and high security facilities, transmitters are an important part of the automation ecosystem. Simple to install and intuitive to use, CDVI transmitters are designed to make life easier for installers and end users alike. Now with AES128-bit high security options benefitting from KeeLoqⓇ rolling code algorithms, these transmitters are ideal for your projects.
CDVI's range of innovative transmitters are well-suited to a wide variety of installation contexts. From residential properties to industrial premises, commercial buildings, and high security facilities, transmitters are an important part of the automation ecosystem. Simple to install and intuitive to use, CDVI transmitters are designed to make life easier for installers and end users alike. Now with AES128-bit high security options benefitting from KeeLoqⓇ rolling code algorithms, these transmitters are ideal for your projects.
Handheld transmitters
Handheld transmitters are a useful and simple radio frequency solution for triggering automatic doors, gates, lights, and more. With 1, 2, or 4 channels.
UHF Solutions
Ultra High Frequency radio transmission solutions are ideal for controlling pedestrian and vehicle access to secure automatic gates. The U4GO range detects vehicles moving up to 80Km/h!
Long-Range Access Control
These long-range access control readers and credentials utilise radio transmission technology instead of proximity chips. This means that the cards send out radio frequency signals that the readers pick up, when the user is up to 15m away. Long-range systems are ideal for warehouses, care homes, and other environments where hands-free access may be required.
Page updated
Google Sites
Report abuse