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AM receivers have no means of rejecting that noise Also, weak signals are (because of their lower amplitude) quieter than strong ones, which requires the receiver to have circuits to compensate for the signal level differences An AM radio station takes a low-frequency audio signal such as people talking or music (2500 Hz) and mixes it or superimposes on a high-frequency carrier wave (540 kHz), see Figure 5-2 It sends this radio signal out into the air as electromagnetic waves using a tall antenna The electromagnetic wave travels through the air, going in all directions At home, your AM radio takes this incoming signal, in a process called detection With amplitude modulation it is simple All you need to

Returns a floating-point value defined by the string value The legal floating-point syntax is specified by the WMLScript 11 numeric string grammar for decimal floating-point literals with the following additional parsing rule: M Parsing ends when the first character is encountered that cannot be parsed as being part of the floating-point representation

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do is to rectify the signal, through a rectifier which removes the bottom half of every cycle Essentially you are throwing away the high-frequency or carrier part, but keeping the low-frequency or audio part At the output of the detector the original audio information is sent to the speaker in your radio You then hear whatever was broadcast at the radio station The AM radio project that we are going to build in this chapter is called a TRF or tuned radio frequency type AM radio, see Figure 5-3 The TRF AM Radio design was at the forefront of radio design in the early 1920s It utilized a tuned front end which allowed only RF energy of interest to be amplified by the RF amplifier, the signal was then passed on to the detector

Exceptions In case of a parsing error, an invalid value is returned If the system does not support floating-point operations, an invalid value is returned Examples var a = LangparseFloat("1234"); // a var b = LangparseFloat(" +734e2 Hz") // var c = LangparseFloat(" 70e-2 F"); // var d = LangparseFloat("-1 C"); // var e = LangparseFloat(" 100 "); // var f = LangparseFloat("Number: 55"); // var g = LangparseFloat("73e meters"); // var h = LangparseFloat("73e- m/s"); // = b c d e f g h 1234 = 734e2 = 700e-2 = -01 = 1000 = invalid = invalid = invalid

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langparseInt(value)

frequency is magnified by resonance so that it stands out at a very much higher level of signal strength The original ZN414 IC, has now been replaced by the MK484, which is considerably easier to locate The integrated circuit is a 3-pin, tuned radio frequency circuit, and incorporates several RF stages, automatic gain control and an AM detector The receiver front-end is easily overloaded and the operating voltage of the IC is somewhat critical to achieve good results, but all-in-all the receiver is a great little radio for AM reception The TRF radios were some of the first radios on the scene when the dawn of radio appeared in the early 1920s The front-end of the TRF receiver as mentioned consists of a tuned circuit composed of the ferrite inductor, a tuning capacitor and the TRF radio chip A small square plastic 0-200 pF tuning capacitor was used for this radio project, but you could locate any suitable tuning capacitor within the range and it will work equally well Often these small tuning capacitors will have additional on-board trimmer capacitors, but we used only the main tuning capacitor in the center of the device The second critical component of the TRF receiver is the coil at L1, which is wound on a ferrite bar First, let s begin winding the coil at L1 The coil needs approximately 65 turns of #28 gauge enameled Litz wire on a 21 2 long ferrite rod The windings should measure approximately 25 mm wide Start winding the coil, close to one end, by securing the enameled wire by a piece of insulating tape Leave approximately 100 mm for connection The quality of reception is dependent upon the care taken in winding the antenna coil The signal reception will vary, dependent upon location, and is better away from large buildings that can distort the signal Wind the wire tightly around the ferrite rod, taking care to keep the coil together and not to overlap the windings To help hold the windings in place a piece of double-sided tape can be placed on the ferrite rod Before soldering the antenna coil to the circuit board, you will need to scrape off the enamel coating from the ends of the wire The two components L1 and C2 are connected in parallel to form an LC network The Litz wire coil and the ferrite bar give the LC network a high Q or quality factor This is important to the selectivity of the receiver, that is the ability to tune into one radio station at a time.

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