ExtraClassSylalbus2009jan-AD7FO

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Rev 2.02 E9F01 The velocity factor of a transmission line is the velocity of the wave in the transmission line divided by the velocity of light in a vacuum. Velocity Factor = Velocity of wave in Transmission line / Velocity of light E9F02 The transmission line dielectric materials used determine the velocity factor in a transmission line. E9F03 Because Electrical signals move more slowly in a coaxial cable than in air, the physical length of a coaxial cable transmission line is shorter than its electrical length. E9F04 The typical velocity factor for a coaxial cable with solid polyethylene dielectric is 0.66. E9F05 The physical length of a coaxial transmission line that is electrically one-quarter wavelength long at 14.1 MHz is (Assuming a velocity factor of 0.66.) 3.5 Meters. ¼ Wavelength (in Transmission line) = (300/F(MHz)) / 4 x Velocity Factor ¼ Wavelength (in Transmission line) =(300/14.1 x .66) / 4 or 14.04/4 or 3.51 meters E9F06 The physical length of a parallel conductor feed line that is electrically one-half wavelength long at 14.10 MHz (Assuming a velocity factor of 0.95.) is 10 meters. ½ Wavelength (in Transmission line) = (300/F(MHz))/2 x Velocity Factor ½ Wavelength (in Transmission line) = (300/14.1 x .95)/2 or 20.21/2 or 10.10 meters E9F07 450-ohm ladder line, at 50 MHz, will have a lower loss when compared to 0.195-inch-diameter coaxial cable (such as RG-58). E9F08 Velocity factor is the term for the ratio of the actual speed at which a signal travels through a transmission line to the speed of light in a vacuum. E9F09 The physical length of a typical coaxial transmission line that is electrically one-quarter wavelength long at 7.2 MHz (Assume a velocity factor of 0.66) would be 6.9 meters. ¼ Wavelength(in Transmission line) = (300/F(MHz))/4 x Velocity Factor ¼ Wavelength(in Transmission line) =(300/7.2 x..66)/4 or 27.50/4 or 6.87 meters E9F10 A 1/8-wavelength transmission line presents an inductive reactance to a generator when the line is shorted at the far end. Jack Tiley <strong>AD7FO</strong> Page 96 3/15/2009
Rev 2.02 E9F11 A 1/8-wavelength transmission line presents a capacitive reactance to a generator when the line is open at the far end. E9F12 A 1/4-wavelength transmission line presents a very low impedance to a generator when the line is open at the far end. E9F13 A 1/4-wavelength transmission line presents a very high impedance to a generator when the line is shorted at the far end. E9F14 A 1/2-wavelength transmission line presents a very low impedance to a generator when the line is shorted at the far end. E9F15 A 1/2-wavelength transmission line presents very high impedance to a generator when the line is open at the far end. E9F16 The primary differences between foam-dielectric coaxial cable as opposed to solid-dielectric cable, assuming all other parameters are the same are reduced safe operating voltage limits, reduced losses per unit of length and higher velocity factor. E9G - The Smith chart E9G01 Impedance along transmission lines can be calculated using a Smith chart. E9G02 The coordinate system is used in a Smith chart is resistance circles and reactance arcs. E9G03 Impedance and SWR values in transmission lines are often determined using a Smith chart. E9G04 Resistance and reactance are the two families of circles and arcs that make up a Smith chart. Figure E9-3 Jack Tiley <strong>AD7FO</strong> Page 97 3/15/2009
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Rev 2.02 Preparing for the Extra cl
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Rev 2.02 Guide to using this syllab
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Rev 2.02 SUBELEMENT E4 -- AMATEUR R
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Rev 2.02 ELEMENT 4 - EXTRA CLASS QU
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Rev 2.02 E1A09 (Band Plan Chart) Th
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Rev 2.02 E1B13 (FCC Rules) Communic
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Rev 2.02 E1D08 (FCC Rules) The 2 me
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Rev 2.02 E1E20 (FCC Rules) You must
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Rev 2.02 SUBELEMENT E2 - OPERATING
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Rev 2.02 E2A13 Geosynchronous satel
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Rev 2.02 E2B17 Immunity from fading
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Rev 2.02 E2D02 The definition of
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Rev 2.02 SUBELEMENT E3 -- RADIO WAV
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Rev 2.02 E3C01 Auroral activity cau
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Rev 2.02 E4A06 A spectrum analyzer
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Rev 2.02 E4B09 High impedance input
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Rev 2.02 E4C06 If t he thermal nois
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Rev 2.02 E4D11 Third-order intermod
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Rev 2.02 SUBELEMENT E5 -- ELECTRICA
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Rev 2.02 E5B Time constants and pha
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Rev 2.02 Example 2: To find the ang
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Rev 2.02 j 50 -j 25 E5B12 The phase
Page 45 and 46: Rev 2.02 j 600 -j300 E5C04 In polar
Page 47 and 48: Rev 2.02 Parallel circuit solutions
Page 49 and 50: Rev 2.02 R=300 Ω XL= (2 π FL) or
Page 51 and 52: Rev 2.02 Power Factor represents th
Page 53 and 54: Rev 2.02 SUBELEMENT E6 -- CIRCUIT C
Page 55 and 56: Rev 2.02 Field-effect transistors e
Page 57 and 58: Rev 2.02 E6B12 Junction diodes are
Page 59 and 60: Rev 2.02 E6D02 Cathode ray tube (CR
Page 61 and 62: Rev 2.02 E6E04 The technique used t
Page 63 and 64: Rev 2.02 E6F07 Cadmium sulfide will
Page 65 and 66: Rev 2.02 E7A07 An AND gate produces
Page 67 and 68: Rev 2.02 When a Class C rather than
Page 69 and 70: Rev 2.02 E7C01 In a low-pass filter
Page 71 and 72: Rev 2.02 E7D02 One characteristic o
Page 73 and 74: Rev 2.02 E7E05 A pre-emphasis netwo
Page 75 and 76: Rev 2.02 E7F08 One purpose of a mar
Page 77 and 78: Rev 2.02 E7G17 The typical output i
Page 79 and 80: Rev 2.02 E7H19 A phase-locked loop
Page 81 and 82: Rev 2.02 E8A06 The approximate rati
Page 83 and 84: Rev 2.02 E8B13 In time division mul
Page 85 and 86: Rev 2.02 E8D07 An electromagnetic w
Page 87 and 88: Rev 2.02 E9A10 Antenna bandwidth is
Page 89 and 90: Rev 2.02 E9B10 The “Method of Mom
Page 91 and 92: Rev 2.02 E9C09 The elevation angle
Page 93 and 94: Rev 2.02 E9D09 An advantage of usin
Page 95: Rev 2.02 E9E08 An SWR greater than
Page 99 and 100: Rev 2.02 E9H05 The main drawback of
Page 101 and 102: Rev 2.02 SUBELEMENT E0 -- SAFETY [1
Page 103 and 104: Rev 2.02 Jack Tiley AD7FO Page 103
Page 105 and 106: Rev 2.02 Capacitors in series C= __
Page 107 and 108: Rev 2.02 Impedance of complex serie
Page 109 and 110: Rev 2.02 Calculating Component valu
Page 111 and 112: Rev 2.02 AC Voltage Calculations Th
Page 113: Rev 2.02 Jack Tiley AD7FO Page 113
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