What is a VHF Leaky Feeder System

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What is a VHF Leaky Feeder System

In the 1940s, American scientist Sidney Darlington had the idea of a VHF leaky feeder communication system. This is one of the most popular communications systems used by ham radio operators all over the world today. VHF leaky feeders are mainly used for long-distance communication, typically between base stations and mobile transceivers; they don’t offer any features like data or transactional capability.

VHF leaky feeder systems are a type of analog modulation technique used for communication between transmitter and receiver. A VHF leaky feeder is a communications system that uses amplitude modulation (AM) processes to link radio stations, base stations, repeaters, and mobile units using modulated carrier wave transmission signals. 

This technique transmits a continuous stream of information from one location to another. The individual bits of information are sampled every 20 microseconds. The information is encoded as audio tone frequencies, which vary in a highly narrow range.

How does the VHF Leaky Feeder System work?

A continuous stream of bits (or digital data) is modulated onto the carrier radio wave using an analog modulation technique. 

A modulator receives the digital information and converts it into an audio tone. The audio tones are then transmitted at the desired frequency (1.8 MHz in this case). Once the receiver detects the transmitted tone, it extracts the information and displays them on its screen. 

Because the frequency of the transmitted tone is constant, any receiver can detect it regardless of its distance from the transmitting station. Thus, a VHF Variable Frequency Modulated (VFm) system consists of a transmitter and a receiver linked together using a leaky feeder circuit. 

VHF leaky feeders work with amplitude modulation (AM). The information to be transmitted is converted into variation in the amplitude of an electrical signal. In the case of VHF variable frequency modulated systems, the information is encoded into the audio frequencies. The AM signal is then transmitted through a leaky feeder that takes time to reach the receiver site. 

When it reaches the receiver, the tone frequency is picked and separated from other noise frequencies before finally displaying it on the screen in bits. This process is known as detection. 

The VHF variable frequency system consists of three parts- transmitter, receiver, and a leaky feeder transmission line that connects both stations. 

The transmitter section consists of the modulator, control, and audio stages. The modulated signal is converted into an audio signal using modulation techniques. The output of the modulator is coupled to the antenna input of the transmitter through a low pass filter and modulator amplifier. The VHF leaky feeder system sends information at varying audio frequencies picked up by an FM detector in the receiver. 

This then scans through menu files or incoming traffic. The FM detector scans the incoming signal and displays transmitted information on the screen. 

The VHF leaky feeder circuit works by sending audio tone frequency (as above). The number of bits in a character or word is sent as a reference frequency picked up by an FM detector. The tuned circuit scans through all frequencies to find the right one once it detects the tone frequency. A bandpass filter separates the frequency from other noise—the extracted bits of information display on the screen. 

These are not used for communications only, but several applications such as code division multiple access (CDMA). CDMA networks work similarly to a VHF system. Like a VHF system, they are much shorter than their analog counterparts since they use digital information instead of audio tone signals.

Becker Varis VHF Leaky Feeder System

The VHF Leaky Feeder System from Becker Communication Company is a type of antenna system that consists of two orthogonal VHF antennas called Spillikins. It operates at frequencies between 150 – 170 MHz (TV) and 175 – 221 MHz (FM). This antenna system is designed for high efficiency in the installation and maintenance stages.

It is possible to point or rotate the two antennas in any direction, thus providing an omnidirectional radiation pattern while still achieving a maximum gain. The system has no main reflector surface, which avoids potential wind loading problems with dishes in high wind areas susceptible to icing or vandalism problems. It also includes a weatherproof case for corrosion protection and easy transportation.


The VHF system is a simple yet effective way of sending data. It is used to send encrypted digital data or any message such as weather forecast, shipping alerts, etc. It works similar to short wave radios, except it uses less frequency bandwidth, and more data can be sent over a shorter distance. This enables smaller transmitters and receivers to be used as compared to the conventional analog systems. If you would like to learn more then contact us today!

Benefits of Mine Radio Systems

admin Mining Communication
Benefits of Mine Radio Systems

Mine Radio systems are a wireless communication system used in mines to transmit data between the various mine equipment such as semaphore, lighting, first aid, and location. It is also used to transmit information to other mining regions through wired or radio line transmissions. 

The use of these systems has become widespread among the mining community due to their reliability and ease of installation. Mine radio systems can be found in nearly any size mining operation, from small coal mines to massive gold mining operations like Barrick.

Advantages of Mine Radio systems

There are several features of mine radio systems that make them a great fit for any mining operation:

  • They are a safe, dependable, and reliable communication system that does not rely on the physical connectivity of wires like other similar systems.
  • The simple installation is often accomplished in only a few hours and requires little technical experience or training.
  • Mine radio systems communicate information to and from any area within a specified radius. They do not require the use of mains electricity or the installation of costly cables into mines.
  • They are flexible in the amount of information available for information purposes.
  • Mine radio systems are a cost-effective communication solution. They often provide greater functionality than wired alternatives that do not offer many of these same advantages.
  • They can be used in an emergency as a backup communication system.

How do the Mine Radio systems work?

As you can see in the above diagram, a transmitter sends a signal to the receiver. The receiver then decodes the signal and displays it on the screen. If your transmitter and receiver are correctly functioning, you will be able to see all of the information that they are receiving from your system. Information sent by these systems can include text information displayed along with graphics like analog clocks or simple designs. 

These radio systems are typically found in smaller operations where people do not have access to computer technology for their operations. Mine radio systems are also very cost-effective as they can be installed in multiple locations within a mine. For example, a mine operator might have a mine radio system installed in the office where employees can communicate with one another or to the control room.

As the demand for these systems increases, so does the size of these mining operations. It is common for many large mining operations to have three or more individual separate installations, each having different functionality and data coming into the system. Many of the larger mines do not even have a system in the office; instead, they use mains power to communicate. 

As you can see, these systems are an effective solution for many different situations in mining operations. As more and more mines begin to implement mine radio systems, it is important for people to understand how they work and their benefits. If you are interested in getting a new mine radio system installed into your mining operation, see us at Superior Tower Solutions.

Becker Communication’s Mine Radio Systems

Mine Radio Systems by Becker Communication is a wireless communication system designed to work in rugged or remote locations. The technology uses electromagnetic waves that are above the ground.

These Radio systems can be found in many different areas; marine, military, mining, forestry, agricultural, and industrial settings. They use very low power consumption and a wide range of frequencies that work well for any application.


These communication systems are becoming more popular in many industries for their ease of use and effective communication. 

With all of the current technological advances, we are seeing many companies turn towards using Mine Radio to increase their employee safety. As you can see, mine radio systems have many important applications in different industries. If you would like to get a new mine radio system installed into your mining operation, contact us today!