75uS is the time constant used for a high-pass filter to enhance the high frequency audio before transmission to help reduce noise upon reception. The PLL is the portion of the IC which locks your chosen transmission frequency to the crystal reference X1. The PLL portion also contains an oscillator circuit which works in conjunction with the external parts of D5 and the STUB (that weird trace on the back of the board). D5 is called a varactor diode, and is a special variety of diode that is connected backwards. As a reverse DC voltage is applied across the diode, its capacitance varies.
An advantage of the star topology is the simplicity of adding additional nodes. The primary disadvantage of the star topology is that the hub represents a single point of failure. Bus: In local area networks where bus topology is used, each node is connected to a single cable. Each computer or server is connected to the single bus cable. A signal from the source travels in both directions to all machines connected on the bus cable until it finds the intended recipient.
Spread spectrum transmission is the process of spreading a signal across a certain frequency domain, giving the signal more bandwidth. This technique is important since it addresses concerns of security, jamming, noise, and natural interference. It also has a lower power requirement and is able to transmit more information than narrowband transmission. Spread spectrum transmission is accomplished by a modulation technique known as frequency hopping (FHSS). Frequency Hopping Spread Spectrum (FHSS) * What is it?
Liam Stephenson controlled assessment Introduction In my course work I will be looking at how the thickness of a converging lens affects the focal length. The factors involved in this experiment are: light, lens curvature, refraction and thickness of the lens, these will determine the focal length; the focal length is the length between the focus and the lens. Light-visible light is an electromagnetic wave in the electromagnetic spectrum The speed of light depending on the medium it is in, for example the speed of light is 300,000 km/s however when light travels through other medium such as water or glass the speed of light is slowed this is because water and glass is denser than a vacuum of air. Due to it being more dense and a change in speed, the direction of the wave will change this is
This light is lost in the cladding of the receiving optical fiber. Core diameter mismatch loss is typically only a concern with multimode optical fiber. To avoid core diameter mismatch make sure to check the cores of your fiber and make sure they are the same size to the best you can. Intrinsic factors that can affect connection performance in fiber-optics come in many types. A numerical aperture (NA) mismatch occurs when the NA of one optical fiber is different from the NA of the other optical fiber.
Minus one point will be given if any indivual goes to the end where no light is provided and if an individual doeasnot mocve for within mean time frame, zero point will be given in the recording table. The analysis of the recording data, will be considered to perform next experiment for second
Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance). Do not round your interim calculations. Round your cost per unit answers to 2 decimal places. Omit the "$" sign in your response.) Reported Income Statement (1,600 units) Manufacturing Variance Marketing and Administrative Variance Sales Price variance (b) Flexible Budget (a units) Sales Activity
When the electron returns to a lower level, a photon with that energy difference is emitted. The peaks in the emission spectra are very sharp and known as line spectra. This emission spectra can be used in identification of elements because the spectra is different for each element. Materials: 1. Spectrum tubes (known and unknown) 2.
Explanation linked to experimental data and research. Detailed scientific explanation given of relationships between current, voltage, resistance, gauge and cross-sectional area, based on research and experimental data. Relationships linked to original hypothesis. Considers effects of distance and diameter on sound quality, explaining how these can be altered to result in good quality sound. * No evidence of achievement for this quality, or evidence insufficient for the award of 1 mark.
Week 11 Laboratory Exercise Between subjects ANOVA State the null and alternative hypothesis Experimental hypothesis is that there will be a difference in reaction time between the three groups. Null hypothesis is that there will be no difference in the reaction times to an emergency situation between subjects in the control group and experimental groups. What is the independent variable and how many levels is it? The independent variable in this study is the handling of a mobile phone, hands free, and no phone. Therefore it is three levels.