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.
 
 

 

 

News

China Claims Its New Anti-Stealth Radars Can Detect the F-22

Popular Mechanics China Claims Its New Anti-Stealth Radars Can Detect the F-22 Popular Mechanics The first, the JY-27A 3-D long-range surveillance/guidance radar, is a Very High Frequency ( VHF ) radar that, according...

Nov 11, 2016

US B-21 stealth bomber will double down on improved stealth technologies to beat Russia and China's antistealth ...

Next Big Future US B-21 stealth bomber will double down on improved stealth technologies to beat Russia and China's antistealth ... Next Big Future The Air Force is planning on building significant electronic...

Nov 21, 2016

Introducing the NEW BCS-200 Speaker Mic by BridgeCom Systems

Introducing the NEW BCS-200 Speaker Mic by BridgeCom Systems eHam.net Since that time, we developed an LTR controller and a new repeater series called the BCR available in UHF, 220 MHz and VHF . BridgeCom ... Our services...

Dec 1, 2016

Amateur radio operator's call sign silenced

Amateur radio operator's call sign silenced Tribune-Review He was an electronic repairman who worked there for more than 43 years. “He loved working there ... He was a co-founder and member of the Laurel Highlands...

Dec 3, 2016

Zhuhai 2016: Stealth aircraft on China's radar

Shephard Media Zhuhai 2016: Stealth aircraft on China's radar Shephard Media Operating in the VHF band, it adopts 2-D electronic scanning in azimuth and elevation. It is the PLA's first active phased array...

Nov 10, 2016

ATSC 3.0 and Educational Media

TV Technology ATSC 3.0 and Educational Media TV Technology It escaped no one's attention at the dawn of radio, TV and the Internet, that electronic media presented some extraordinary benefits to education, beyond...

Nov 14, 2016

SKYWARN Recognition Day On-the-Air Event is Saturday, December 3:

SKYWARN Recognition Day On-the-Air Event is Saturday, December 3: eHam.net So will WX4NHC http://w4ehw.fiu.edu at the National Hurricane Center, on HF, VHF , and UHF, plus APRS and WinLink wx4nhc@winlink.org. WX4NHC ......

Dec 1, 2016

Winegard milestones

Winegard milestones Burlington Hawk Eye The late John Winegard and his son, Randy, were inducted Thursday into the Iowa Business Hall of Fame. Here are some milestones the Burlington company marked since John Winegard made...

Dec 2, 2016

Coast Guard rescues 3 Jet Skiers following collision

Coast Guard rescues 3 Jet Skiers following collision KeysNews.com (registration) For the complete article, please pick up a copy of The Citizen for this day or purchase this day's electronic edition at...

Nov 7, 2016

Pulse Electronics Introduces the Ultra-Thin V-Thinity (PSIBVHF) for Police, Fire and Government In-Building VHF ...

Business Wire (press release) Pulse Electronics Introduces the Ultra-Thin V-Thinity (PSIBVHF) for Police, Fire and Government In-Building VHF ... Business Wire (press release) BUSINESS WIRE)--Pulse Electronics...

Jun 24, 2016

Units & Modules