AM Radio - s3.amazonaws.com
... The antenna converts a current or a voltage signal to an electromagnetic signal which is radiated throughout space. ...
... The antenna converts a current or a voltage signal to an electromagnetic signal which is radiated throughout space. ...
BSNL JTO Question Paper 2 2014
... 1. 1. Reactive current through the capacitive load produces a) Magnetic field b) Electric field c) Supermagnetic field d) None 2. 2. One of the following which gives piero-electric effect is a) Mu metal b) PVDF c) Sapphire d) Ferrites 3. 3. PZT piezo-electric materials have a) Higher curie temperatu ...
... 1. 1. Reactive current through the capacitive load produces a) Magnetic field b) Electric field c) Supermagnetic field d) None 2. 2. One of the following which gives piero-electric effect is a) Mu metal b) PVDF c) Sapphire d) Ferrites 3. 3. PZT piezo-electric materials have a) Higher curie temperatu ...
Introduction to Phasors
... is actually the peak-to-peak voltage of the signal outputted. – Use an amplitude of 8V rather than 4V. – Use a frequency of 50 kHz. ...
... is actually the peak-to-peak voltage of the signal outputted. – Use an amplitude of 8V rather than 4V. – Use a frequency of 50 kHz. ...
AP Physics Daily Problem #140
... An airplane is flying directly over the magnetic south pole of the earth. It has a speed of 200m/s and a wingspan of 60m. The earth’s magnetic field is about 55x10-6T (a) What is the rate at which the aircraft cuts the magnetic flux? ...
... An airplane is flying directly over the magnetic south pole of the earth. It has a speed of 200m/s and a wingspan of 60m. The earth’s magnetic field is about 55x10-6T (a) What is the rate at which the aircraft cuts the magnetic flux? ...
Design and experiments on series fed conformal
... Conformal antenna arrays fitted to the surface of a non planar part of a modern aircrafts, vehicles or ships are considered an attractive alternative for certain applications where planar arrays or reflector antennas have definite drawbacks. Some of the potential advantages are improved aerodynamics ...
... Conformal antenna arrays fitted to the surface of a non planar part of a modern aircrafts, vehicles or ships are considered an attractive alternative for certain applications where planar arrays or reflector antennas have definite drawbacks. Some of the potential advantages are improved aerodynamics ...
ELECTROMAGNETIC INDUCTION THEORY
... an emf and give it a symbol The emf is directly proportional to the rate of change of the magnetic flux. It also changes direction as the field does. The rate (increasing or decreasing) also affects the sign of the emf. This phenomenon is Lenz’s Law . With the coil and an ammeter in a closed circu ...
... an emf and give it a symbol The emf is directly proportional to the rate of change of the magnetic flux. It also changes direction as the field does. The rate (increasing or decreasing) also affects the sign of the emf. This phenomenon is Lenz’s Law . With the coil and an ammeter in a closed circu ...
continuous-time signal
... • QQQQ data is the historical data for an index fund, whose value tracks the stock price of 100 companies. • Go to http://finance.yahoo.com • Near the top of the page enter QQQQ and click “GO”. • In the left hand column click on “historical prices”. • Click on “Download to Spreadsheet”. • Example 1. ...
... • QQQQ data is the historical data for an index fund, whose value tracks the stock price of 100 companies. • Go to http://finance.yahoo.com • Near the top of the page enter QQQQ and click “GO”. • In the left hand column click on “historical prices”. • Click on “Download to Spreadsheet”. • Example 1. ...
ITS_7_Signal loss
... It is not possible to avoid all noise, although it is important to keep the signal as high as possible, and to keep the noise as low as possible. This is called the signal to noise ratio. If there is too much noise then the receiving device will not be able to decode the signals correctly. ...
... It is not possible to avoid all noise, although it is important to keep the signal as high as possible, and to keep the noise as low as possible. This is called the signal to noise ratio. If there is too much noise then the receiving device will not be able to decode the signals correctly. ...
presentation source
... branch of the circuit. Just GUESS!! If your guess is incorrect, the current will come out as a negative number, but the magnitude will still be correct! ...
... branch of the circuit. Just GUESS!! If your guess is incorrect, the current will come out as a negative number, but the magnitude will still be correct! ...
Analog Communication
... • Noise is primarily sharp spikes of energy and contains a lot of harmonics and other highfrequency components. • Detected FM interference is most severe at large value of fi. • Post detected filtering improves the performance of the system. ...
... • Noise is primarily sharp spikes of energy and contains a lot of harmonics and other highfrequency components. • Detected FM interference is most severe at large value of fi. • Post detected filtering improves the performance of the system. ...
IF Alignment - Canadian Vintage Radio Society
... • Ok, so this circuit is solid-state (argh!), so just imagine these are triodes… ...
... • Ok, so this circuit is solid-state (argh!), so just imagine these are triodes… ...
DT3: RF On/Off Remote Control Technology
... As a result, the output power is measured and compared to a set point level in a feedback control circuit so power can be adjusted as required. ...
... As a result, the output power is measured and compared to a set point level in a feedback control circuit so power can be adjusted as required. ...
Fundamentals of Antennas and Radiating systems Introduction: In
... magnitude and phase of their current. For current element under consideration, by continuity, equal and opposite time varying charges must exist on both ends of dl/2 so that such elements are also called a Herzian dipole. As shown in the Fig 7.2, the current element is located at the origin and ori ...
... magnitude and phase of their current. For current element under consideration, by continuity, equal and opposite time varying charges must exist on both ends of dl/2 so that such elements are also called a Herzian dipole. As shown in the Fig 7.2, the current element is located at the origin and ori ...
Lab 11 - Physics Department, Princeton University
... This test is optional because it requires borrowing a 2nd Wavetek generator from another lab station. The goal is to verify that the conceptually simpler modulation scheme described by eq. (1), and shown in the figure at the top of p. 2, is undesirable. To study this you need to generate a waveform ...
... This test is optional because it requires borrowing a 2nd Wavetek generator from another lab station. The goal is to verify that the conceptually simpler modulation scheme described by eq. (1), and shown in the figure at the top of p. 2, is undesirable. To study this you need to generate a waveform ...
ph104exp11_AM_Radio_04 - Physics Department, Princeton
... 6e. The Circuit Output Turn on the amplitude modulation of the Wavetek generator for these finals tests. Testpoint g should show the same AC signal as at testpoint e, but with no DC level. The AC signal here should still show the 1 MHz oscillations within the halfwave form due to the rectification o ...
... 6e. The Circuit Output Turn on the amplitude modulation of the Wavetek generator for these finals tests. Testpoint g should show the same AC signal as at testpoint e, but with no DC level. The AC signal here should still show the 1 MHz oscillations within the halfwave form due to the rectification o ...
21.8 Kirchhoff`s Rules for Complex DC circuits
... But watch the direction of EMF in batteries: R4 Starting at point A, and going with the current: ...
... But watch the direction of EMF in batteries: R4 Starting at point A, and going with the current: ...
Restoration of a 1951 RCA-Victor Model X-711 AM
... AGC is applied to the grid of V2 from the wire below the first set of tuned circuits next to C13 . In the schematic, AM signals pass through the “lower” resonant tanks, while FM signals pass through the “upper” resonant tanks. The nature of the two IF frequencies (455kHz and 10.7MHz) allows for the ...
... AGC is applied to the grid of V2 from the wire below the first set of tuned circuits next to C13 . In the schematic, AM signals pass through the “lower” resonant tanks, while FM signals pass through the “upper” resonant tanks. The nature of the two IF frequencies (455kHz and 10.7MHz) allows for the ...
Ham Radio – General Exam – Study Notes
... Appropriate filters should be built into transmitters and receivers. Transmitters may need an additional low pass filter to remove unwanted harmonics that would affect TVs. TVs and FM radios may need a high pass filter to remove large amounts of HF frequency radiation that can overload them. Hams ar ...
... Appropriate filters should be built into transmitters and receivers. Transmitters may need an additional low pass filter to remove unwanted harmonics that would affect TVs. TVs and FM radios may need a high pass filter to remove large amounts of HF frequency radiation that can overload them. Hams ar ...
AP Physics – Worksheet #7: Chapter 22 Magnetic
... A bar magnet that is 20 cm long is allowed to drop through a horizontal loop as shown. The magnet is oriented vertically with its north pole below its south pole. Use Lenz’s law to determine the direction of the current that flows in the resistor connected across the ends of the loop. Let current fl ...
... A bar magnet that is 20 cm long is allowed to drop through a horizontal loop as shown. The magnet is oriented vertically with its north pole below its south pole. Use Lenz’s law to determine the direction of the current that flows in the resistor connected across the ends of the loop. Let current fl ...
PRACTICE FINAL 1 Solutions - UIC Department of Physics
... Give two angles (between 0° and 180°) which are possible axis angle settings of polarizer B? Answer: 90° and 140° ...
... Give two angles (between 0° and 180°) which are possible axis angle settings of polarizer B? Answer: 90° and 140° ...
Solutions
... The potential difference, V , across the capacitor decays exponentially. The exponential function exp(x) changes by the same factor over a given interval ∆x at any x. In the present case, where the argument x is −t/τ , the potential difference changes by a factor of 10 in the first 1 s. It must ther ...
... The potential difference, V , across the capacitor decays exponentially. The exponential function exp(x) changes by the same factor over a given interval ∆x at any x. In the present case, where the argument x is −t/τ , the potential difference changes by a factor of 10 in the first 1 s. It must ther ...
Communication Channels and Noise
... Microwave signals are higher frequency signals. Due to a higher frequency of operation, microwave systems carry large quantities of information. It is highly directional so it follow line-of-sight (LOS) propagation. The required antenna is smaller due to shorter wavelength (due to higher frequencies ...
... Microwave signals are higher frequency signals. Due to a higher frequency of operation, microwave systems carry large quantities of information. It is highly directional so it follow line-of-sight (LOS) propagation. The required antenna is smaller due to shorter wavelength (due to higher frequencies ...
ECE 4117 Experiment 3 Frequency Modulation ECE 4117
... In this lab, the concept Frequency Modulation (FM) is investigated. Implementation of FM is primarily done through the use of GNU Radio and the USRP. Both transmission and receiving is investigated. Introduction In communication, modulation is the process of varying one or more properties of a highf ...
... In this lab, the concept Frequency Modulation (FM) is investigated. Implementation of FM is primarily done through the use of GNU Radio and the USRP. Both transmission and receiving is investigated. Introduction In communication, modulation is the process of varying one or more properties of a highf ...
Direction finding
Direction finding (DF), or radio direction finding (RDF), is the measurement of the direction from which a received signal was transmitted. This can refer to radio or other forms of wireless communication, including radar signals detection and monitoring (ELINT/ESM). By combining the direction information from two or more suitably spaced receivers (or a single mobile receiver), the source of a transmission may be located via triangulation. Radio direction finding is used in the navigation of ships and aircraft, to locate emergency transmitters for search and rescue, for tracking wildlife, and to locate illegal or interfering transmitters. RDF was important in combating German threats during both the WW-II Battle of Britain and the long running Battle of the Atlantic. In the former, the Air Ministry also used RDF to locate its own fighter groups and vector them to detected Germain raids.RDF systems can be used with any radio source, although very long wavelengths (low frequencies) require very large antennas, and are generally used only on ground-based systems. These wavelengths are nevertheless used for marine radio navigation as they can travel very long distances ""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, which could be tuned to radio beacons called non-directional beacons or commercial AM radio broadcasters, was until recently, a feature of most aircraft, but is now being phased out For the military, RDF is a key tool of signals intelligence. The ability to locate the position of an enemy transmitter has been invaluable since World War I, and played 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 beamforming for highly accurate results, and are part of a larger electronic warfare suite.Radio direction finders have evolved, following the development of new electronics. Early systems used mechanically rotated antennas that compared signal strengths, 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. Early British radar sets were referred to as RDF, which is often stated was a deception. In fact, the Chain Home systems used large RDF receivers to determine directions. Later radar systems generally used a single antenna for broadcast and reception, and determined direction from the direction the antenna was facing.