VHF Circuits

  

 

Very high frequency (VHF) is the radio frequency range from 30 MHz to 300 MHz. Frequencies immediately below VHF are denoted High frequency (HF), and the next higher frequencies are known as Ultra high frequency (UHF). The frequency allocation is done by ITU. Common uses for VHF are FM radio broadcast, television broadcast, land mobile stations (emergency, business, and military), long range data communication with radio modems, Amateur Radio, marine communications, air traffic control communications and air navigation systems (e.g. VOR, DME & ILS).
 
It is considered that one of the most significant events in the history of broadcast television regulation was the creation of an artificial scarcity of VHF licenses. The FCC's decision to locate television service on the limited VHF band changed the ways of television service and network competition in the industry. The rationale of this policy was to create a situation of increased competition and viewer choice.
 
Television was added to the VHF band in 1941 on channels one through six. During the war freeze, channel one was removed and used only for war purposes. Later, in 1945, channels seven through thirteen were added.
Marine VHF radio is installed on all large ships and most seagoing small craft. It is used for a wide variety of purposes, including summoning rescue services and communicating with harbours, locks, bridges and marinas, and operates in the VHF frequency range, between 156 to 174 MHz.
 
Although it is widely used for collision avoidance, its use for this purpose is contentious and is strongly discouraged by some countries, including the UK. VOR, short for VHF omnidirectional radio range, is a type of radio navigation system for aircraft. A VOR ground station broadcasts a VHF radio composite signal including the station's identifier, voice (if equipped), and navigation signal. The identifier is morse code. The voice signal is usually station name, in-flight recorded advisories, or live flight service broadcasts.
 
 

Circuits










This is a Simple Switchable Vhf Active Antenna Circuit Diagram. This circuit is the best circuit of Vhf . How to build Simple Switchable Vhf Active Antenna Circuit Diagram ? Lets start! The AA-7 ac...

Electronic Circuit Diagrams & Schematics: Simple TV Transmitter circuit diagram (VHF) - Totally Free Electronic Circuits, Diagrams,Schematics and Projects. We make free Electronic work for student ...

Electronic Circuit Diagrams & Schematics: Affordable Vhf-Uhf Diode Rf Switch Circuit Diagram - Totally Free Electronic Circuits, Diagrams,Schematics and Projects. We make free Electronic work for s...

Here's a design circuit for very simple antenna amplifier electronic circuit project can be designed using this circuit diagram. This antenna amplifier electronic circuit can be used for a frequenc...

We able to optimize this project with the Simple video transmitter circuit In the wireless to can be used with televisions that without the Video in port. as show in Figure 5 to bring the video sig...

Nonstop-Free Electronic Circuits Project Diagram and Schematics ... RF Circuits. This is the simple project of RF Amplifier using VHF and UHF MAR-6 Circuit Diagram. This circuit broadband RF amplif...