ExtraClassSylalbus2009jan-AD7FO

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Rev 2.02 E4E07 You can determine if line-noise interference is being generated within your home by turning off the AC power line main circuit breaker while listening on a battery-operated radio. E4E08 A common-mode signal at the frequency of the radio transmitter can be picked up by electrical wiring near the radio transmitter. E4E09 When using an IF type noise blanker nearby signals may appear to be excessively wide even if they meet emission standards. E4E10 Common characteristics of interference caused by "touch controlled" electrical devices include: • The interfering signal sounds like AC hum on an AM receiver or a carrier modulated by 60 Hz FM on a SSB or a CW receiver. • The interfering signal may drift slowly across the HF spectrum. • the interfering signal can be several kHz in width and usually repeats at regular intervals across a HF band. E4E11 The most likely cause if you are hearing combinations of local AM broadcast signals inside one or more of the MF or HF ham bands is nearby corroded metal joints that are mixing and re-radiating the BC signals (Broadcast band) as an intermodulation product. E4E12 One disadvantage of using some automatic DSP notch-filters when attempting to copy CW signals is that the DSP filter can remove the desired signal at the same time as it removes interfering signals. E4E13 Arcing contacts in a thermostatically controlled device, a defective doorbell or doorbell transformer inside a nearby residence or a malfunctioning illuminated advertising display might be the cause of a loud "roaring" or "buzzing" AC line type of interference that comes and goes at intervals. E4E14 One type of electrical interference that might be caused by the operation of a nearby personal computer is the appearance of unstable modulated or unmodulated signals at specific frequencies. Jack Tiley <strong>AD7FO</strong> Page 36 3/15/2009
Rev 2.02 SUBELEMENT E5 -- ELECTRICAL PRINCIPLES [4 Exam Questions -- 4 Groups] E5A Resonance and Q: characteristics of resonant circuits: series and parallel resonance; Q; half-power bandwidth; phase relationships in reactive circuits E5A01 Resonance can cause the voltage across reactances in series to be larger than the voltage applied to them. E5A02 Resonance in an electrical circuit is the frequency at which the capacitive reactance equals the inductive reactance. E5A03 The magnitude of the impedance of a series R-L-C circuit at resonance is approximately equal to circuit resistance. At resonance a series resonant circuit L and C presents a low impedance so the circuit resistance is set by the resistor. E5A04 The magnitude of the impedance of a circuit with a resistor, an inductor and a capacitor all in parallel, at resonance is approximately equal to circuit resistance. At resonance a parallel resonant circuit presents a very high impedance across the resistor. E5A05 The magnitude of the current at the input of a series R-L-C circuit as the frequency goes through resonance is Maximum. At resonance a series circuit presents a low impedance and current would be limited by the resistor Tuning to either side of resonance would causeadditional reactive resistance and therefore lower current flow in the circuit. E5A06 The magnitude of the circulating current within the components of a parallel L-C circuit at resonance is at a maximum. E5A07 The magnitude of the current at the input of a parallel R-L-C circuit at resonance is at a Minimum. E5A08 The voltage and the current through and the voltage across a series resonant circuit are in phase E5A09 The voltage and the current through and the voltage across a parallel resonant circuit are in phase. Jack Tiley <strong>AD7FO</strong> Page 37 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
Page 11 and 12: Rev 2.02 E1B13 (FCC Rules) Communic
Page 13 and 14: Rev 2.02 E1D08 (FCC Rules) The 2 me
Page 15 and 16: 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
Page 21 and 22: Rev 2.02 E2B17 Immunity from fading
Page 23 and 24: Rev 2.02 E2D02 The definition of
Page 25 and 26: Rev 2.02 SUBELEMENT E3 -- RADIO WAV
Page 27 and 28: Rev 2.02 E3C01 Auroral activity cau
Page 29 and 30: Rev 2.02 E4A06 A spectrum analyzer
Page 31 and 32: Rev 2.02 E4B09 High impedance input
Page 33 and 34: Rev 2.02 E4C06 If t he thermal nois
Page 35: Rev 2.02 E4D11 Third-order intermod
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
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Rev 2.02 E9A10 Antenna bandwidth is
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Rev 2.02 E9B10 The “Method of Mom
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Rev 2.02 E9C09 The elevation angle
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Rev 2.02 E9D09 An advantage of usin
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Rev 2.02 E9E08 An SWR greater than
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Rev 2.02 E9F11 A 1/8-wavelength tra
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Rev 2.02 E9H05 The main drawback of
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Rev 2.02 SUBELEMENT E0 -- SAFETY [1
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Rev 2.02 Jack Tiley AD7FO Page 103
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Rev 2.02 Capacitors in series C= __
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Rev 2.02 Impedance of complex serie
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Rev 2.02 Calculating Component valu
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Rev 2.02 AC Voltage Calculations Th
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Rev 2.02 Jack Tiley AD7FO Page 113
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