ExtraClassSylalbus2009jan-AD7FO

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Rev 2.02 E9E02 The gamma match is a system that matches an unbalanced feed line to an antenna by feeding the driven element both at the center of the element and at a fraction of a wavelength to one side of center. E9E03 The stub match uses a short perpendicular section of transmission line connected to the feed line near the antenna. E9E04 The purpose of the series capacitor in a gamma-type antenna matching network is to compensate for the inductive reactance of the matching network. E9E05 The driven element reactance must be capacitive in a 3-element Yagi to be tuned using a hairpin matching system. E9E06 The equivalent lumped-constant network for a hairpin matching system on a 3-element Yagi is an L network. E9E07 Reflection coefficient best describes the interactions at the load end of a mismatched transmission line. The terms - VSWR, Return Loss, Reflected Power are all ways to describe match or mismatch between a transmitter and antenna system. The table end of sub element E9 shows the relationship between them and the amount of power that would be reflected back from a given mismatch. Note that with a VSWR of 1.4 to 1 only 2.8 % of the transmitter power is reflected back. Jack Tiley <strong>AD7FO</strong> Page 94 3/15/2009
Rev 2.02 E9E08 An SWR greater than 1:1 measurement describes a mismatched transmission line. SWR is the ratio of the maximum voltage (resulting from the interaction of Incident and reflected voltages along a transmission line) to the minimum voltage. E9E09 Using a Gamma match is an effective method of connecting a 50-ohm coaxial cable feed-line to a grounded tower so it can be used as a vertical antenna. E9E10 Inserting a 1/4-wavelength piece of 75-ohm coaxial cable transmission line in series between the antenna terminals and the 50-ohm feed cable is an effective way to match an antenna with 100-ohm terminal impedance to a 50-ohm coaxial cable feed-line. E9E11 An effective way of matching a feed-line to a VHF or UHF antenna when the impedances of both the antenna and feed-line are unknown is to use the "universal stub" matching technique. E9E12 The primary purpose of a "phasing line" when used with an antenna having multiple driven elements is to ensure that each driven element operates in concert with the others to create the desired antenna pattern. E9E13 The purpose of a "Wilkinson divider is to divide power equally among multiple loads while preventing changes in one load from disturbing power flow to the others. E9F - Transmission lines: characteristics of open and shorted feed lines: 1/8 wavelength; 1/4 wavelength; 1/2 wavelength; feed lines: coax versus open-wire; velocity factor; electrical length; transformation characteristics of line terminated in impedance not equal to characteristic impedance Jack Tiley <strong>AD7FO</strong> Page 95 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
Page 7 and 8:
Rev 2.02 ELEMENT 4 - EXTRA CLASS QU
Page 9 and 10:
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
Page 17 and 18:
Rev 2.02 SUBELEMENT E2 - OPERATING
Page 19 and 20:
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
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 and 90: Rev 2.02 E9B10 The “Method of Mom
Page 91 and 92: Rev 2.02 E9C09 The elevation angle
Page 93: Rev 2.02 E9D09 An advantage of usin
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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