Critical Frequency changes with time of day, atmospheric conditions and angle of fire of the radio waves by antenna.

Frequency compensation is implemented by modifying the gain and phase characteristics of the amplifier's open loop output or of its feedback network, or both, in such a way as to avoid the conditions leading to oscillation.

All the bands mentioned in this article are in the Very High Frequency ( VHF ) band, which extends from 30 to 300 MHz.

The clocks are compared using GPS signals and Two-Way Satellite Time and Frequency Transfer.

Frequency responses are shown for the Butterworth, Chebyshev, inverse Chebyshev, and elliptic filters.

Frequency and proportion of particular abnormal action potential patterns, " jitter " and " blocking ," are diagnostic.

Use ( USE ) and Used For ( UF ) indicators are used when an authorized term is to be used for another, unauthorized, term ; for example, the entry for the authorized term " Frequency " could have the indicator " UF Pitch ".

International amateur radio ALE High Frequency channels are frequency coordinated with all Regions of the International Amateur Radio Union ( IARU entity of ITU ), for international, regional, national, and local use in the Amateur Radio Service.

There are may iteration of the answer but the most common by me over the years was that the abbreviations for Superframe ( SF ) was in conflict with the sill commonly used technology of the day, Single Frequency Signaling ( SF Signaling ).

Note: Frequency frogging is accomplished by having modulators, which are integrated into specially designed repeaters, translate a low-frequency group to a high-frequency group, and vice versa.

Frequency standards in a network or facility are sometimes administratively designated as primary or secondary.

Other widely used multiple access techniques are Time Division Multiple Access ( TDMA ) and Frequency Division Multiple Access ( FDMA ).

** Shared Resources High Frequency Radio Program ( SHARES )-The SHARES HF Radio Program brings together the assets of over 1, 000 HF radio stations worldwide to voluntarily pass emergency messages when normal communications are destroyed or unavailable.

Two screening methods or types are Amplitude Modulation ( AM ) screening and stochastic or Frequency Modulation ( FM ) screening.

Negotiations to defend the frequency allocation for parts of the spectrum most useful for observing the Universe are coordinated in the Scientific Committee on Frequency Allocations for Radio Astronomy and Space Science.

Frequency assignments between US and Canadian users are closely coordinated since much of the Canadian population is within VHF radio range of the US border.

Frequency of a precipitation threshold of interest may be determined from the number of measurements exceeding that threshold value within the total time period for which observations are available.

Segments in most of The Americas are represented by ITU Region 2 from 11. 7 to 12. 2 GHz ( Local Oscillator Frequency ( LOF ) 10. 750 GHz ), allocated to the FSS ( fixed service satellite ), uplink from 14. 0 to 14. 5 GHz.

Magnetometers used in the Earth sciences are called geophysical surveys, a term that also embraces a wide range of other geophysical techniques including gravity, seismic refraction, seismic reflection, electromagnetics ( EM ), induced polarisation ( IP ), magneto-tellurics ( MT ), controlled source magneto-tellurics ( CSAMT ), sub-audio magnetics ( SAM ), mise-a-la-masse, resistivity, self Potential ( SP ) and Very Low Frequency ( VLF ).

Radio Frequency Identification ( RFID ) tagging is the use of very small electronic devices ( called " RFID tags ") which are applied to or incorporated into a product, animal, or person for the purpose of identification and tracking using radio waves.

Frequency modulation ( FM ) and amplitude modulation ( AM ) are common modes of modulating the carrier.

Frequency Modulation ( FM ) and Phase Modulation ( PM ) are two types of angle modulation.

LTE examples are the Physical Multicast Channel ( PMCH ) and MBSFN ( Multicast Broadcast Single Frequency Network ).

Arabic Letter Frequency and a detailed study of letter and word frequency analysis of the entire book of Qur ' an are provided by Intellaren Articles.

These tags are commonly known as LFID's or LowFID's ( Low Frequency Identification ).

The boundary between the two regions contains four back-to-back high-voltage direct-current ( HVDC ) substations which convert the frequency ; these are Shin Shinano, Sakuma Dam, Minami-Fukumitsu, and the Higashi-Shimuzu Frequency Converter.

These tags are commonly known as HFID's or HighFID's ( High Frequency Identification ).

This allowed Virgin's VHF ( Very High Frequency ) timetable to be progressively introduced through early 2009, the highlights of which are a three-trains-per-hour service to both Birmingham and Manchester during off-peak periods, and nearly all Anglo-Scottish timings brought under the 4 hours 30 minutes barrier — with one service ( calling only at Preston ) achieving a London-Glasgow time of 4 hours 08 minutes.

* Page on Orthogonal Frequency Division Multiplexing at http :// www. iss. rwth-aachen. de / Projekte / Theo / OFDM / node6. html accessed on 24 September 2007.

Utilizing the early work at Bell Labs, AT & T eventually established their Frequency Control Products division, later spun off and known today as Vectron International.

MUF is a median frequency, defined as the highest frequency at which skywave communication is possible 50 % of the days in a month, as opposed to the lowest usable high frequency ( LUF ) which is the frequency at which communication is possible 90 % of the days, and the Frequency of optimum transmission ( FOT ).

* Some equipment in particle accelerators such as Radio Frequency Quadrupoles ( RFQs ) or electron targets use copper MMC compounds such as Glidcop to retain the material properties of copper at high temperatures and radiation levels.

Parks worked with Inara George on a record released in 2008, An Invitation, and they performed two songs together on 8 January 2008 at the Walt Disney Concert Hall in Los Angeles, as part of the program Concrete Frequency: Songs of the City.

Yagi-Uda antenna s like these six are widely used at Very High Frequency | VHF and Ultrahigh frequency | UHF frequencies.

* Frequency multiplier, a device that generates a signal at an integer multiple of its input frequency

* Frequency deviation, the maximum allowed " distance " in FM radio from the nominal frequency a station broadcasts at

; Frequency response ( Fs ): This measurement tells you over what frequency range output level for an audio component will remain reasonably constant ( either within a specified decibel range, or no more than a certain number of dB from the amplitude at 1kHz ).

The simplest form of product detector mixes ( or hetrodynes ) the RF or IF signal with a locally derived carrier ( the Beat Frequency Oscillator, or BFO ) to produce an audio frequency copy of the original audio signal and a mixer product at twice the original RF or IF frequency.

Among the classic disco that was a staple in Chicago clubs at the time, typical tracks one could hear him play were Visage-" Frequency 7 ", Klein & MBO-" Dirty Talk ", ESG-" Moody ", Patrick Adams-" Big Phreek ", Liquid Liquid-" Optimo ", First Choice-" Let No Man Put Asunder ", a lot of Philly Soul Classics and even pop hits like Eurythmics-" Sweet Dreams " and Talk Talk-" It's My Life ".

* MUST ( मस ् त ) FM, the campus radio station of the university operates from here at 107. 8 MHz Frequency Modulation.

* Frequency: Events that occur suddenly and fit well with the news organization's schedule are more likely to be reported than those that occur gradually or at inconvenient times of day or night.

Official time signals are generated by the Time and Frequency Standards Laboratory at the National Physical Laboratory in New Delhi, for both commercial and official use.

The main branch consists of two ion source terminals followed by a Radio Frequency Quadrupole and by an Interdigital linac IH linac accelerator resonating at 36 MHz up to the energy of 1. 4 MeV / u.

The Time and Frequency Standards Section in the PMG Research Laboratories at 59 Little Collins Street, Melbourne maintained the frequency checks to ensure that the system was " on time ".

* Stanford Very Low Frequency Research at Palmer Station

Frequency allocation for this network start at 163. 0625 MHz to 165. 6875Mhz ( channel spacing of 12. 5 kHz ).

A very small version of the diffraction horn was designed in 1991 into the JBL model 2405H Ultra-High Frequency Transducer, yielding a 90 ° x 35 ° output pattern at.

Frequency response of a high gain amplifier is limited to about one-tenth the excitation frequency, although this is often mitigated by exciting magnetic amplifiers with currents at higher than utility frequency.

It can also be heard via the Eutelsat " Hotbird " Satellite at 13 ° East ( Frequency 11. 526 GHz horizontal ), on cable and through live streaming on the WRS website.

* Frequency summation – For skeletal muscles, the force exerted by the muscle is controlled by varying the frequency at which action potentials are sent to muscle fibers.