• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Sign in Sign up
Upload
WIPO IPC: Internet Publication
WIPO IPC: Internet Publication

... some other variable of which the value can be related to the value of the required variable, as in measuring a change in temperature by measuring a resultant change in the length of a column of mercury. However, since the same device or instrument may, instead of giving an immediate indication, be u ...
Wavelength-Preserving Polarization-Insensitive All-Optical 3R
Wavelength-Preserving Polarization-Insensitive All-Optical 3R

... In the near future, more sophisticated types of data trac will be required compared to the current demand. For example, on demand interactive high de nition internet TV may prevail over conventional cable or satellite TV and internet based networking between homes and businesses will evolve beyond ...
HFAN-04.5.1 Measuring Random Jitter on a
HFAN-04.5.1 Measuring Random Jitter on a

... per division on each until only the rising or falling edge of the clock and data are on the screen. Remove any skew between the channels. Turn averaging on for both channels. Next, adjust the volts per division and time per division, taking care to insure that the rising or falling edge is not too s ...
Chapter 2 OPTICAL FIBER CHARACTERISTICS AND SYSTEM
Chapter 2 OPTICAL FIBER CHARACTERISTICS AND SYSTEM

... fiber, respectively, and g R is the Raman gain coefficient. Note that α in (2.7) is the approximation of effective interaction length when z is large. For a 1.55-µm singlechannel system employing a standard single-mode optical fiber, Pth is found to be of the order of 1 W. Commonly, the transmitted ...
Standards Project - Telecommunications Industry Association
Standards Project - Telecommunications Industry Association

... 600 ohm resistor representing a telephone using the 600 ohm source/load test configuration without loop specified in the draft ANSI/TIA-PN-470.112 standard and compares it to measurements using the 900 ohm source/load configuration with a 2.7 km, 26 AWG loop that is traditional for analog telephone ...
More basic electricity
More basic electricity

... The 1-k resistor is not in series with the 2.2-k since the some of the current that went through the 1-k might go through the 3-k instead of the 2.2-k resistor. ...
Party Bonus Casino Game
Party Bonus Casino Game

... form of impedance transformer, promoting our tendency to misconstrue them as little more than a matching device, while their primary function is to provide proper current paths between balanced and unbalanced configurations. * To help clarify the misunderstanding, this chapter explains some of the u ...
BDTIC  www.BDTIC.com/infineon
BDTIC www.BDTIC.com/infineon

... FM Radio has a long history to its credit starting from its development in 1933. Today, FM radio is an integral part of almost all mobile phones, including the ultra low cost models. Till recently, the headset served as the antenna for FM Radio reception, wherein the antenna size is a bit relaxed an ...
High Performance CMOS Transmitters for
High Performance CMOS Transmitters for

... and the number of users in the system. One specific advancement that has had a dramatic effect on wireless communications is the development of integrated circuit technology. The invention of the integrated circuit in the late 1950s by Jack Kilby and Robert Noyce would eventually change the way most ...
REFERENCE MEASURING METHODS
REFERENCE MEASURING METHODS

... player. Since the characteristics of this Optical Pick-up Unit (OPU) have a significant influence on the read-out signals of the disc, this player part had to be specified in the Red Book (wavelength, Numerical Aperture, polarization and intensity distribution). For nearly all other parameters no co ...
Study Guide for Exam Questions
Study Guide for Exam Questions

... B. Only frequencies authorized for RACES or ARES stations C. Only frequencies that are within your operating privileges D. Only frequencies used by police, fire or emergency medical services ...
BDTIC
BDTIC

... FM Radio has a long history to its credit starting from its development in 1933. Today, FM radio is an integral part of almost all mobile phones, including the ultra low cost phones. FM Radio broadcast today is not just used to listen to songs and news, but also used for RDS (Radio Data System) to r ...
www.ijecs.in International Journal Of Engineering And Computer Science ISSN:2319-7242
www.ijecs.in International Journal Of Engineering And Computer Science ISSN:2319-7242

... purposes. The basic idea is that the block codes are used to remove some constellation combinations that produce large peaks and the encoded system will have smaller peaks then the uncoded system. One of the major drawbacks of this method is that it severely reduces data rate in order to achieve a g ...
BDTIC  www.BDTIC.com/infineon
BDTIC www.BDTIC.com/infineon

... FM Radio has a long history to its credit starting from its development in 1933. Today, FM radio is an integral part of almost all mobile phones, including the ultra low cost phones. FM Radio broadcast today is not just used to listen to songs and news, but also used for RDS (Radio Data System) to r ...
Tunable Microwave Phase Locked Oscillator Ismael Omar Phase Locked Loop Implementation
Tunable Microwave Phase Locked Oscillator Ismael Omar Phase Locked Loop Implementation

... tween measured and simulated values. The reason for this is because the components are behaving differently when implemented in circuit then simulated. There are many nonlinear analysis of PLL devised during the years but only three will be discussed here. ...
Audio System Troubleshooting, Delco/Delphi VN, VHD
Audio System Troubleshooting, Delco/Delphi VN, VHD

... are removed. The only exception to this rule is the Presets that are stored using the Auto Store (Auto) button. The Auto Store (Auto) button automatically stores the six strongest stations on Push buttons one through six (1–6). These are temporary Presets unless the user presses the Auto Store (Auto ...
Electric Part Specification
Electric Part Specification

... adjusting the LCD brightness. It can save power. Distance SENSOR is used for identifying the distance between user’s face and phone during a call. If the distance is less than a value, phone will turn off the touch panel and LCD. It can save power and avoid mis-operation. It communicates with CPU th ...
Fractional/Integer-N PLL Basics
Fractional/Integer-N PLL Basics

... Frequency Synthesis is the engineering discipline dealing with the generation of multiple signal frequencies, all derived from a common reference or time base. The time base used is typically a Temperature Compensated Crystal Oscillator (TCXO). The TCXO provides a reference frequency to the synthesi ...
ETSI TR 103 053 V1.1.1
ETSI TR 103 053 V1.1.1

... common to all these ENs, their specific values were defined on a case-by-case basis. The content of the old Point-toPoint ENs was further transferred into the multipart standard EN 302 217 [i.4] while in a first time most of the parameters values were kept unchanged. As a consequence the RSL figures ...
Microwave Oven Signal Interference And
Microwave Oven Signal Interference And

... data packets will be reliably transmitted by a Wi-Fi device even when a MWO is operating. In the case where this interference mitigation is not used, the data rate remains at 100% but the BER is much higher, as shown in Table 1. This means that many data packets are likely to be dropped as a result ...
Advanced Mixers
Advanced Mixers

... 1. (a) Simplified circuit model of 4-phase passive mixer. (b) LO driving waveforms. (c) Equivalent model to (a), with ng nature of the waveforms in the middle. ...


... is being developed to provide medium and short range wireless communications with a sort of advantages if compared with Bluetooth WPAN (IEEE 802.15.1) [1]. The spectrum of the 60 GHz WPAN is allocated from 57 − 66 GHz (in Europe) allowing a huge spectral capacity of the link. In addition, the 60 GHz ...
Adaptive  Systems  in Digital Communication  Designs
Adaptive Systems in Digital Communication Designs

... In digital communications an attempt is made to determine which signal from a discrete signal has been transmitted. The transmitter codes and modulates a digital information sequence in a manner suitable for the transmission channel in question. This signal is then transmitted through the channel wh ...
Secure Full-Duplex Spectrum-Sharing Wiretap Networks with
Secure Full-Duplex Spectrum-Sharing Wiretap Networks with

... Finally, Section VI concludes the key findings for the paper. II. S YSTEM M ODEL We consider a multi-antenna cognitive wiretap system as shown in Fig. 1, which consists of a secondary transmitter (Alice), a full-duplex secondary receiver (Bob), an eavesdropper (Eve) and a primary receiver (PR). Simi ...
Everything you wanted to know about the 67 Cougar Sequential
Everything you wanted to know about the 67 Cougar Sequential

... for Cougars built prior to Jan 03 1967, the stop lamp relay (K11) . The circuitry is still dependent on 3 other relays (Turn Signal Relay K7, Turn Signal Indicator Relay K5 and the Emergency Warning Relay K6) as well as the turn signal switch, the emergency hazard switch, a couple of fuses and at le ...
1 2 3 4 5 ... 15 >

Radio direction finder



A radio direction finder (RDF) is a device for finding the direction, or bearing, to a radio source. The act of measuring the direction is known as radio direction finding or sometimes simply direction finding (DF). Using two or more measurements from different locations, the location of an unknown transmitter can be determined; alternately, using two or more measurements of known transmitters, the location of a vehicle can be determined. RDF is widely used as a radio navigation system, especially with boats and aircraft.RDF systems can be used with any radio source, although the size of the receiver antennas are a function of the wavelength of the signal; very long wavelengths (low frequencies) require very large antennas, and are generally used only on ground-based systems. These wavelengths are nevertheless very useful for marine navigation as they can travel very long distances and ""over the horizon"", which is valuable for ships when the line-of-sight may be only a few tens of kilometres. For aerial use, where the horizon may extend to hundreds of kilometres, higher frequencies can be used, allowing the use of much smaller antennas. An automatic direction finder, often tuned to commercial AM radio broadcasters, is a feature of almost all modern aircraft.For the military, RDF systems are a key component of signals intelligence systems and methodologies. The ability to locate the position of an enemy broadcaster has been invaluable since World War I, and play a key role in World War II's Battle of the Atlantic. It is estimated that the UK's advanced ""huff-duff"" systems were directly or indirectly responsible for 24% of all U-Boats sunk during the war. Modern systems often used phased array antennas to allow rapid beam forming for highly accurate results. These are generally integrated into a wider electronic warfare suite.Several distinct generations of RDF systems have been used over time, following the development of new electronics. Early systems used mechanically rotated antennas that compared signal strengths in different directions, and several electronic versions of the same concept followed. Modern systems use the comparison of phase or doppler techniques which are generally simpler to automate. Modern pseudo-Doppler direction finder systems consist of a number of small antennas fixed to a circular card, with all of the processing occurring in software.Early British radar sets were also referred to as RDF, which was a deception tactic. However, the terminology was not inaccurate; the Chain Home systems used separate omni-directional broadcasters and large RDF receivers to determine the location of the targets.
  • studyres.com © 2023
  • DMCA
  • Privacy
  • Terms
  • Report