X-Nico

4 unusual facts about high frequency


Independent sideband

Suppressed-carrier ISB was employed in point-to-point (usually overseas) radiotelephony and radioteletype by shortwave (HF).

Manly-Warringah Radio Society

Over the course of the weekend some of the over 400 radio-active lighthouses around the world will be contacted from headland, usually on HF frequencies.

Pulse-position modulation

Pulse position modulation is also used for communication to the ISO/IEC 15693 contactless smart card as well as the HF implementation of the Electronic Product Code (EPC) Class 1 protocol for RFID tags.

Wireless Monitoring Organisation

These monitoring stations carry out monitoring in MF, HF, VHF, lower part of UHF.


Amateur Radio High Altitude Ballooning

Long duration flights frequently must use high frequency custom built transmitters and slow data protocols such as RTTY, Hellschreiber, Morse code and PSK31, to transmit data over great distances using little battery power.

Indianapolis Island

He also had an HF Transceiver that he used to listen for radio signals around the world.

Kenwood Corporation

Kenwood has offered lines of HF, VHF/UHF, and portable amateur radio models, including some with built-in digital data modes (Automatic Packet Reporting System, built on AX.25 packet radio) and modems needed to send and receive these protocols.

Mount Santa Rita Naval Link Station

The link started in Nha Trang, then came to the Philippines via underwater cable to NAVCOMSTAPHIL, through Mt. Santa Rita to Clark AB and then to the HF transmitter site at the Naval Communication Transmitting Facility, Capas in Tarlac, which transmitted to the US Mainland.

Schweizer RU-38 Twin Condor

The aircraft also has HF, VHF and UHF radios for voice and encrypted voice communications, plus direction finding.

The U.S. Naval Communication Station Philippines

During the Vietnam War, all communications from Vietnam to the United States Mainland were routed first through here by an undersea cable from Nha Trang, then forwarded to Naval Link Station Mount Santa Rita, then to the Dau relay facility at Clark AFB, and finally to the HF transmitter site at the U.S. Naval Radio Station Tarlac also known as U.S. Naval Radio Transmitter Facility, Capas, Tarlac.

Unwin Radar

Unwin is part of the Super Dual Auroral Radar Network (SuperDARN), an international radar network for studying the upper atmosphere and ionosphere that operates in the High Frequency (HF) bands between 8 and 22 MHz.


see also

1981 in Norway

The Hessdalen light UFO phenomenon emerged in December and occurred with high frequency for the next several years.

Archaeogenetics of the Near East

According to DNA testing, Druze are remarkable for the high frequency (35%) of males who carry the Y-chromosomal haplogroup L, which is otherwise uncommon in the Mideast (Shen et al. 2004).

Automatic message exchange

Automatic message exchange (AME): In an adaptive high-frequency (HF) radio network, an automated process allowing the transfer of a message from message injection to addressee reception, without human intervention.

Beta dispersion

Beta dispersion is the phenomenon associated with the ability of a biological cell membrane to filter out low frequency currents and allow high frequency currents to pass through.

Birdnest

Birdnest wiring - Electronic interconnection used for prototyping and high frequency applications

Borough of Copeland

Geoffrey Hodgson (2008) argues that this Viking invasion accounts for the high frequency of the Hodgson surname in the area.

Bruce R. Davis

In 1992, he was a Visiting Scholar with the Communications Division of the Defence Science and Technology Organisation (DSTO), Salisbury, South Australia, and was involved with high frequency data communication systems.

Caton with Littledale

Geoffrey Hodgson (2008) argues that the Viking invasion of the area accounts for the relatively high frequency of the Hodgson surname in Caton and elsewhere in Lonsdale.

Direct market access

The race for ultra-low latency direct market access is a hot topic amongst high frequency traders, Brokers and technology vendors such as Artha Financial Technology, Fusion Systems Raptor, Ullink or Fidessa.

FluxNet

This can be measured by applying a high frequency AC voltage to the plates and measuring the capacitance through an RC circuit.

GETCO

Global Electronic Trading Company, an electronic market-making/high-frequency trading firm now merged into KCG Holdings

Hapag-Lloyd Express

Hapag-Lloyd Express (previously also marketed as HLX.com) was a no-frills, high-frequency, express airline based in Langenhagen, Germany.

Media Access Project

The FCC allowed a new portion of high-frequency spectrum to be allocated for WiFi networks in 2003.

Metro Chapultepec

The station is also served by two trolleybus lines of STE: One is route S, which runs east from Chapultepec to Metro Velódromo along the arterial thoroughfares known as Eje 2 Sur and Eje 2A Sur and is one of two high-frequency trolleybus lines that STE calls "Zero-Emissions Corridors".

Metro Velódromo

Local bus service to the station includes trolleybus line S of STE, which runs west to Metro Chapultepec along the arterial thoroughfares known as Eje 2 Sur and Eje 2A Sur and is one of two high-frequency trolleybus lines that STE calls "Zero-Emissions Corridors".

Modbury Heights, South Australia

High frequency bus services as well as connections to the O-Bahn Busway mean 10% of Modbury Heights residents travel to work by bus.

Repeating waveforms

The high order bits of the accumulator form the output address, while the typically larger number of bits in the accumulator and addition value results in an arbitrarily high frequency resolution.

Sensors for Arc Welding

Inductive sensors evaluate the attenuation of a high-frequency electro-magnetic field which has been generated by eddy currents in the work piece.

St Kilda–Fremantle AFL controversies

Contests between the two clubs since Fremantle's admission in 1995 have a particularly high frequency of controversial and unusual events.

Ultrasonic cleaning

Ultrasonic cleaning uses Cavitation bubbles induced by high frequency pressure (sound) waves to agitate a liquid.

Waggle dance

Both low- and high-frequency components emitted by dancing bees induce passive antennal movements in stationary bees according to Coulomb's law.

Wien's law

Wien approximation, an equation used to describe the short-wavelength (high frequency) spectrum of thermal radiation

William T. Coleman III

Coleman also held positions as a Director of Product Development at VisiCorp and Manager of the High Frequency Systems Group at GTE Sylvania.