frequency lock - definition. What is frequency lock
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%ما هو (من)٪ 1 - تعريف

ELECTRONIC SYSTEM FOR GENERATING ANY OF A RANGE OF FREQUENCIES
Frequency Synthesiser; Frequency synthesiser; Frequency synthesis
  • Philips TDA6651TT - 5 V mixer/oscillator and low noise PLL synthesizer for hybrid terrestrial tuner

Lock (water navigation)         
  • Agde Round Lock
  • Operation of caisson lock
  • <u>Operation of a canal lock</u><br/>
1–3. Boat enters 'empty' lock<br/>
4. Bottom gates are closed, bottom paddles closed, top paddles opened, lock starts to fill<br/>
5. Lock is filling with water, lifting boat to the higher level
  • gates]]. The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.
  • [[Dalmuir]] drop lock
  • Berendrecht Lock (right) and Zandvliet Lock (left), located at the entrance to the Port of Antwerp (top) from the Scheldt (foreground)
  • Lock on the River [[Neckar]] at [[Heidelberg]] in Germany
  • Iroquois Lock on the [[Saint Lawrence Seaway]]
  • A pound lock on the Keitele–[[Päijänne]] Canal at [[Äänekoski]] in [[Central Finland]]
  • Collection of lock windlasses. Note: rakes are for clearing trash out of the lock.
  • Hatton flight]] in England
  • Doubled locks. Left lock has boat in it, right lock (center of drawing) is empty. This is on the Erie Canal at Lockport.
  • Entrance to Minden shaft lock
  • The turf-sided [[Monkey Marsh Lock]] on the Kennet & Avon Canal at [[Thatcham]]
  • 180px
  • Model of early river pound lock, constructed in Lankheet water park, Netherlands
  • abbr=on}} in a lock
  • Snubbing a boat to keep it from hitting the downstream gates. Note the rope wrapped around the snubbing post.
  • [[Three Gorges Dam]] model view. A pair of five locking steps is at center with a ship lift to the left
  • [[Three Gorges Dam]] lock near [[Yichang]] on [[Yangtze]] river, China
  • Barges at a lock on the [[Mississippi River]]
FALL STRUCTURE WITH A FIXED CHAMBER IN WHICH THE WATER LEVEL CHANGES
Canal locks; Ship lock; Lock (canal); Lock and dam; Shiplock; Navigation lock; Pound lock; Lock (river); Locks (canal); Canal lock; Locks (water transport); Sea lock; Gate (water transport); Lock (ship); Ship locks; Mitre gate; Staircase locks; Shaft lock; Twin lock; Sluse; Sluser; Canal Lock; Lock gate; Lock navigation; Stop lock; Lock gates; Lock flight; Lock-chambers; Shipping lock; Lock chamber; Staircase lock; Lock (waterway); Lock (water transport); Lock (waterwat transport); Dock gate; Lock (water); Drop lock; Flight of locks; Lock flights; Lock paddle; Lock rise; Double lock
A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls.
Frequencies         
  • Diagram of the relationship between the different types of frequency and other wave properties.
  • Complete spectrum of [[electromagnetic radiation]] with the visible portion highlighted
  • Modern frequency counter
  • Hz]]
  • The [[sound wave]] spectrum, with rough guide of some applications
NUMBER OF OCCURRENCES OR CYCLES PER TIME
Wave period; Frequencies; Period (physics); Frequency (wave motion); Frequency dependence; Oscillation frequency; Frekvens; Periodic time; Frequency measurement; Period (frequency); Temporal frequency; Repetition frequency; Occurrence frequency; Event frequency; Oscillation rate; Repetition rate; Occurrence rate; Event rate; Rate of occurrence; Rate of repetition; Rate of oscillation; Wave frequency; Ordinary frequency; Aperiodic frequency
·pl of Frequency.
Lock (waltz)         
IN A WALTZ
Lock (Waltz); Back lock; Turning lock; Turning lock to right; Forward lock (waltz)
There are several types of lock step in waltz dancing, including International Standard waltz. A "lock step" is when the moving foot approaches to the standing foot and crosses in front of or behind it, creating a "check" position.

ويكيبيديا

Frequency synthesizer

A frequency synthesizer is an electronic circuit that generates a range of frequencies from a single reference frequency. Frequency synthesizers are used in many modern devices such as radio receivers, televisions, mobile telephones, radiotelephones, walkie-talkies, CB radios, cable television converter boxes, satellite receivers, and GPS systems. A frequency synthesizer may use the techniques of frequency multiplication, frequency division, direct digital synthesis, frequency mixing, and phase-locked loops to generate its frequencies. The stability and accuracy of the frequency synthesizer's output are related to the stability and accuracy of its reference frequency input. Consequently, synthesizers use stable and accurate reference frequencies, such as those provided by a crystal oscillator.