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 FM transmitter in VHF range. As Figure 1 Sonar with up to 2 watts, when used with a supply voltage of about 24V. In the case of applications typically do not want a high transmission. This ...

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...

This CCD camera sensor is very useful, small size, cheap and install easily. to TV video in, by RF transmitter circuit as wireless. A C1815 transistor as main.

Vhf video transmitter 8051. The code is written in assembly to control four 8x8 dot matrix LED display. The TV transmitter circuit given here uses UK standard 1 FM modulation for sound and PAL for ...

Circuit Projects Nonstop-Free Electronic Circuits Project Diagram and Schematics. Home · DMCA Policy · Privacy Policy · Disclaimer · Contact Us · Home RF ... SEA-6 is a circuit amplifier bandwidth...

Circuit Projects Nonstop-Free Electronic Circuits Project Diagram and Schematics ... A very simple VHF UHF Low-Noise amplifiers circuit can be designed using the MAX2664 and MAX2665 ultra-compact L...


Build A Long Range FM Transmitter (Spybug)


2.4G 2W Wireless Audio Video Transmitter and Receiver High Power and Long Dis...


Practical Circuits: RC Transmitters and Receivers - How to remove and play wi...


Advent Calendar of Circuits 2011: Day 18: Simple VHF Receiver