VHF is also used for line of sight communication such as aircraft-to-aircraft and aircraft-to-ATC.

The television system for each country will specify a number of television channels within the UHF or VHF frequency ranges.

The SECAM standard used in Metropolitan France used the SECAM-L and a variant of the channel information for VHF channels 2-10.

French overseas possessions and many French-speaking African countries use the SECAM-K standard and a mutually incompatible variant of the channel information for VHF channels 4-9 ( not channels 2-10 ).

Before the All-Channel Receiver Act of 1962 required US television receivers to be able to tune the entire VHF and UHF range ( which in North America was NTSC-M channels 2 through 83 on 54 to 890 MHz ), a set-top box known as a UHF converter would be installed at the receiver to shift a portion of the UHF-TV spectrum onto low-VHF channels for viewing.

Before cable-ready TV sets became common in the late 1980s, an electronic tuning device called a cable converter box was needed to receive the additional analog cable TV channels and transpose or convert the selected channel to analog radio frequency ( RF ) for viewing on a regular TV set on a single channel, usually VHF channel 3 or 4.

As better syndicated product fell off the VHF stations, Turner would pick it up for his station at a very low price.

Vostok 1 is nearing the VHF radio horizon for Khabarovsk and they respond, " Repeat.

The GV-8 included a TV receiver for VHF and UHF channels.

* 10 nanoseconds ( 10 ns ) – cycle time for frequency 100 megahertz ( 1 Hertz ), radio wavelength 3 m ( VHF, FM band )

Hence VHF networks are sometimes informally referred to by the channel number they are seen on terrestrial TV in the Mega Manila area ( e. g. Channel 2 or Dos for ABS-CBN, Channel 5 or Singko for TV5, and Channel 7 or Siyete for GMA Network ) while some networks have the channel numbers in their name ( e. g. TV5, Studio 23 and Net 25 which are seen on channels 23 and 25 respectively ).

Circulators exist for many frequency bands, ranging from VHF up to optical frequencies, the latter being used in optical fiber networks.

* VHF / UHF / Microwave Radio Propagation: A Primer for Digital Experimenters

At upper VHF and UHF frequencies, the metal skin of a car or aircraft can serve as a ground plane for whip antennas projecting from it.

It is sometimes used for a ( VHF / UHF ) television antenna.

In telecommunication, a maritime broadcast communications net is a communications net that is used for international distress calling, including international lifeboat, lifecraft, and survival-craft high frequency ( HF ); aeronautical emergency very high frequency ( VHF ); survival ultra high frequency ( UHF ); international calling and safety very high frequency ( VHF ); combined scene-of-search-and-rescue ; and other similar and related purposes.

The path loss in other frequency bands ( MW, SW, Microwave ) is predicted with similar methods, though the concrete algorithms and formulas may be very different from those for VHF / UHF.

On VHF, phased arrays are used extensively for FM broadcasting.

This value is typical for VHF commercial radio while 0. 35μV is probably more typical for UHF.

However, a length of 250 feet would not likely be used for 2m VHF radios.

* 241-RF Interface Requirements for VHF Frequency Hopping Tactical Radio Systems

His work, as important as it was in its own right, was a part of a continuum of progress in communications and electronics that since his time has brought forward color television, the personal computer, the Internet, cable and satellite radio and TV, personal mobile phones, audio, video and computing, digital stereo radio on both the medium wave and VHF-FM bands, and digital high definition television on VHF, UHF, cable and satellite.

Thereware 30 UHF and 7 VHF Port-au-Prince ( plus 5 cable TV systems )

All five requests were for each station to broadcast on channel 7 ; Frank Marx, ABC's vice president in charge of engineering, thought at the time that the low-band ( channels 2 through 6 ) TV channels would be reallocated for military use, thus making these five stations broadcasting on VHF channel 7 the lowest on the TV dial and therefore the best channel positions.

For analog TV, VHF transmission range is a function of transmitter power, receiver sensitivity, and distance to the horizon, since VHF signals propagate under normal conditions as a near line-of-sight phenomenon.

The VHF TV band in Australia was originally allocated channels 1 to 10-with channels 2, 7 and 9 assigned for the initial services in Sydney and Melbourne, and later the same channels were assigned in Brisbane, Adelaide and Perth.

Several TV stations were allocated to VHF channels 3, 4 and 5A, which were within the FM radio bands although not yet used for that purpose.

In New Zealand, the four main Free-to-Air TV stations still use the VHF Television bands ( Band I and Band III ) to transmit to New Zealand households.

From then on, TV was broadcast on both VHF and UHF ( VHF being a monochromatic downconversion from the 625-line colour signal ), with the exception of BBC2 ( which had always broadcast solely on UHF ).

The last British VHF TV transmitters closed down on January 3, 1985.

* Red TV ( VHF signal 7 )

* UCV TV ( 9 VHF signal )

On playback, these devices often give the user the option to output the baseband signal or to modulate it onto a VHF or UHF frequency compatible with a TV tuner ( i. e., appearing on a selected TV channel ).

UHF TV signals are generally more degraded by moisture than lower bands, such as VHF TV signals.

Then, effects of the transmission and any recovery period can be examined using associated instrumentation, including VHF and UHF radars, HF receivers, and optical cameras.

The advantages of fewer users sharing a frequency, greater authorized output power, clarity of FM transmission, lack of interference by distant stations due to " skip ", and consistent communications made the VHF frequencies an attractive alternative to the overcrowded CB channels.

1142 ( Transmitter Receiver ) manufactured by GEC, the distance being too great for direct VHF transmission.

* 29 October 1970-BBC Radio Oxford officially begins transmission at 5pm on 95. 0MHz VHF.

TV3 also uses NICAM on their VHF transmission frequency ( Channel 12 ) in the Klang Valley, but uses Zweikanalton on their UHF transmission frequency ( Channel 29 ).

Marine VHF mostly uses " half-duplex " transmission, where communication can only take place in one direction at a time.

For VHF, DSC has its own dedicated Receiver for monitoring Channel 70, but uses the main VHF transceiver for transmission.

Reflection of VHF and higher frequencies is important for radio transmission and for radar.

There were two main reasons for this – the first and principal reason was the fear that German bombers could use the VHF transmission waves of television as a perfect guiding beam for homing into the centre of London.

It possesses four transmission mechanisms for VHF broadcasts and three transmitters for television.

Radio equipment: 2 VHF PR4G transmitter / receivers ( 1 for tactical links ; 1 for firing system data transmission ).

Later in the 1990s, the stereo transmission was introduced into their VHF broadcast.

TV3 currently broadcasts under UHF ( Ultra High ) Frequency, although it is also available in the Klang Valley under VHF ( Very High ) Frequency band III Channel 12 ( TV3 initially started transmission in the Klang Valley on VHF Band III Channel 12 ).

ntv7 currently transmission VHF ( Very High Frequency ) on Channel 7 and UHF ( Ultra High Frequency ) on Channel 37 in Klang Valley.

Southwestern operates and maintains 1, 380 miles of high-voltage transmission lines, 24 substations, and 46 microwave and VHF radio sites from field offices.

Rather, it is HAAT ( the height above the surrounding area ) which is used to determine how far a broadcast station ( or any other sort of VHF or higher radio-frequency ) transmission will travel.

Initially, Arfon was a relay of Preseli, receiving its 405-line VHF transmission off-air on channel 8 and rebroadcasting it on channel 10.

To reduce transmission line loss the transmitter building is usually immediately adjacent to the antenna for VHF and UHF sites, but for lower frequencies it may be desirable to have a distance of a few score or several hundred metres between the building and the antenna.