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What type of polarization are more efficient when used over sea water at frequency below 100MHz?
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What does the ionosphere do to microwaves?
To oversimplify it, the ionosphere either reflect microwaves or allows it to pass through depending upon its frequency, the threshold is approximately 100MHz. Anything below that gets reflected anything higher passes through.
What are the types of polarization?
electronic polarization ionic or atomic polarization orientation or dipole polarization space charge polarization
What are the below audible frequency sounds?
Sounds below human's lowest audible frequency of 20Hz are known as Infrasound.
What is alpha cut of frequency?
it is the frequency at which the current amplification drops 3dB below its low frequency value.
What is cross-polarization?
AnswerIn RF communications, there are basically 3 common polarizations. They are horizontal polarization, vertical polarization, and circular polarization. Use the link below on antenna theory and see some examples and gather more information.Basically, polarization describes how the E-field is moving when it leaves the antenna.In horizontal polarization the signal moves in a horizontal fashion (-).In vertical polarization the signal moves in a vertical fashion (|).In circular polarization the signal moves in a circular fashion (O) with either left-handed or right-handed rotation.Now, when you want to talk to someone using horizontal or vertical polarization you want to match their angle of polarization exactly for the strongest signal.Cross-polarization is radiation orthogonal to the desired polarization. For instance, the cross-polarization of a vertically polarized antenna is the horizontally polarized fields.This is important to know because when you are setting up something like a satellite connection. In order to allow more signals through the satellite transponder within a fixed bandwidth and with decreased interference, the satellite makers alternate the polarization between adjacent transponder channels. (-|-|-|-|-|-|). Two adjacent channels can be "shoved right up against each other" and will interfere in a minimal way if they are polarized oppositely. Since interference affects their customers, satellite vendors are very touchy about proper polarization, and monitor gaps, called "guard bands" to ensure that you are properly aligned.
Are heat pumps efficient below 30 degrees?
The new generation of heat pumps are efficient below thirty. Just make sure the one you buy is designed for your climate.
What is polarization index?
Polarization Index is an indicator which gives an idea of the cleanliness of the windings. It is a ratio of the Insulation Resistance Measured for 10 minutes to the insulation resistance value measured after 1 minute. Since it is a ratio; it does not have any units.Polarization Ratio = Insulation Resistance after 10 minutes/ Insulation Resistance after 1 minuteThe Polarization Index should be above 2.0 to be permissible. Machines having PI below 2.0 cannot be operated. The Polarization Index does not have any significant relation with temperature upto 50 deg. C. However, the Polarization Index test should not be conducted at a temperature beyond 50 deg. C
An economy working below its most efficient production levels?
An economy working below its most efficient production levels points inside the production possibilities frontier. This is in the context of a production possibilities curve.
What is RF coil?
RF (Radio Frequency Coil) is a coil, which is designed to resonate at a frequency some where in the radio spectrum frequency. See L C Circuit Link Below.
What is the frequency in hertz of 103 MHz?
That is the frequency of the G Sharp/A flat two octaves below middle C (great octave).
What is the name given to sound waves having frequency below 20hertz?
Infrasonic.
How does a capacitor acts as a filter?
The cutoff frequency of filter depends upon the value of capacitor and resistance. Therefore, below cutoff frequency or above this frequency, capacitor allow to pass all other frequencies.
