ExtraClassSylalbus2009jan-AD7FO

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Rev 2.02 E9C03 The radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed in phase is a figure-8 broadside to the axis of the array. E9C04 A basic rhombic antenna is a bidirectional. It is four-sided. Each side is one or more wavelengths long and is open at the end opposite the transmission line connection E9C05 The main advantages of a terminated rhombic antenna are wide frequency range, high gain and high front-to-back ratio (gain). E9C06 The disadvantages of a terminated rhombic antenna for the HF bands are that the antenna requires a large physical area and 4 separate supports. E9C07 A terminating resistor on a rhombic antenna changes the radiation pattern from bidirectional to unidirectional. E9C08 An antenna elevation pattern over real ground is shown in Figure E9-2. 180 150 Two 1/4 wavelength verticals 1/2 wavelength apart, feed in phase 120 Figure E9-2 90 Over Real Ground Jack Tiley <strong>AD7FO</strong> Page 90 3/15/2009 60 -40 -30 -20 -10 30 0
Rev 2.02 E9C09 The elevation angle of peak response in the antenna radiation pattern shown in Figure E9-2 is 7.5 degrees. E9C10 The front-to-back ratio of the radiation pattern shown in Figure E9-2 is 28 dB. E9C11 Four elevation lobes appear in the forward direction of the antenna radiation pattern shown in Figure E9-2. E9C12 When a vertically polarized antenna is mounted over seawater versus rocky ground the far-field elevation pattern low-angle radiation increases. A lower angle of radiation means longer skip. E9C13 When constructing a Beverage antenna, to achieve good performance at the desired frequency it should be one or more wavelengths long. E9C14 The electric field will be horizontally oriented for a Yagi with three elements mounted parallel to the ground. E9C15 The conductivity and dielectric constant of the soil in the area of the antenna strongly affects the shape of the farfield, low-angle elevation pattern of a vertically polarized antenna. ***** E9C16 This question has been removed by the QPC Jack Tiley <strong>AD7FO</strong> Page 91 3/15/2009
Page 1 and 2:
Rev 2.02 Preparing for the Extra cl
Page 3 and 4:
Rev 2.02 Guide to using this syllab
Page 5 and 6:
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
Page 39 and 40: Rev 2.02 E5B Time constants and pha
Page 41 and 42: Rev 2.02 Example 2: To find the ang
Page 43 and 44: 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: Rev 2.02 E9B10 The “Method of Mom
Page 93 and 94: Rev 2.02 E9D09 An advantage of usin
Page 95 and 96: Rev 2.02 E9E08 An SWR greater than
Page 97 and 98: Rev 2.02 E9F11 A 1/8-wavelength tra
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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