Electronics Engineering

"dB", aka decibels, is a logarithmic unit of measurement in base 10. A 10 dB change in signal power means that the power has changed by a factor of 10. A 20 dB change relates to a change of power of a factor of 100, etc. dB are computed using 10*log10(power). If measured in amplitude rather than power, this would convert to 20*log10(amplitude).

1.

having improper termination

using low quality cables or connectors

A varactor diode is most commonly used as the variable reactor. The varactor is a semiconductor pnjunction diode, and its junction capacitance is varied by the application of a steady signal from a local microwave oscillator, called the pump. Amplification of weak signal waves occurs through a nonlinear modulation or signal-mixing process which produces additional signal waves at other frequencies. This process may provide negative-resistance amplification for the applied signal wave and increased power in one or more of the new frequencies which are generated.

It depends on the phototransistor's design. Most are normally open until you shine light on them.

There are myriads of meters components to do measurements the basic is the oscilloscope and multimeter.

Panic!

NO,I believe that although it allows us to communicate with people around the world.Or around the corner,we lose a part of our human connection.That only comes from having direct contact..

one bit at a time

it is because the tolerance between tow of the resistors would overlap and that would be pointless.

شو بدري امي انا اصلن فايت اسئلكم يا محترمين

MVA= square root of (MW2 + MVAR2 )

Use a multimeter and test if there is a voltage drop or current over the wire circuit.

A: When all circuit do not exactly tie into a common point. This situation is called daisy chain whereby a ground will add or subtract to influence all circuitry's

If the load current descrease, there is less voltage drop caused by the resistance of the wire, so the voltage is higher.

Yes

series

what is the direction of motion of current carrying wire when electron is moving from east to west

Yes it is possible to test a diode with a multimeter.

The 'input' side of a transformer is called its 'primary' side, whereas the 'output' side is termed its 'secondary' side. The ratio of its secondary to primary voltage is equal to the ratio of the number of turns in the secondary windings to the number of turns in the primary winding. So if, for example, a transformer's secondary winding has twice as many turns as its primary winding, then the secondary winding will produce twice the voltage applied to the primary winding.

Passive Electronically Scanned Array (PESA) and the Active Electronically Scanned Array (AESA) are basically same in technology and principles of operation , both systems are capable of steer its beam Electronically through utilization of Phase Shifter hence it could be made in fully solid state configuration where no moving parts required (like APG-77 Radar on F-22 or Zhuk-AE Radar onboard MiG-35) they're only differs in source of Radio Frequency (RF) source The AESA uses multiple numbers of Radiating Elements where each of them have their own Transmitter and Receiver Module, making the Antenna where those modules located become "active" because it can Radiate by itself While the PESA system uses common RF source that usually found in conventional Radar like Klystrons, Magnetrons and Travelling Wave Tubes (this one especially, most common in Airborne Application like Fighter Radar). In Terms of Advantages the AESA system is typically better than PESA because of following factors : 1.because the Antenna Elements contain its own Transmitter and Receiver modules and located Right behind the Radiator, it would have lower or even No accidental loss , unlike her PESA sister which still require a connection to be made between its RF source to Radiating elements , incidental loss may occur. 2. High fault tolerance, failure of some modules will not hamper the operation of Radar (typical AESA Radar may contain 100++ Elements) however the entire device would fail if the failure occurs in 10% of total module counts.

3.No Single Point Failure , since basically each modules in active Version contains its own transmitter and Receiver modules, the passive device however since it still use single Transmitter device like Traveling Wave tube , failure of the transmitter may hamper the RADAR operations

Answers by :Xenostrike 06 a.k.a Stealthflanker an Illegally Banned member from Electrosphere

EDIT- Bit improvements and adding single point failure in previous answer

Just to help point the above answer at the questions Passive systems have a single point of failure in its transmit devices (Travelling Wave Tubes,Wave Guides, Microstrips and Power Dividers as well as Antenna Feed System) . Active antenna do not have a single point of failure and a meant to degrades performance gracefully except probably malfunctions in its tapering systems or when the beam is steered in very high deflection angle which will reduce antenna effective Area, increase beamwidth hence reducing gain an compromise detection range. Active versions are much more flexible as phase can be varied in each or a groups of Radiating elements to create different waveforms or beamshapes .

A T5AL is a tubular 5 amp 20mm x 5mm Slow Blow Anti Surge glass fuse.

Flash as in camera? No. Flash as in Flash Player? No

The software used to program PLC's (Programmable Logic Controllers) differs from one manufacturer to the next. There is no universal software. However, one of the most common forms of programming found is called the "ladder diagram".