ExtraClassSylalbus2009jan-AD7FO

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Rev 2.02 SUBELEMENT E4 -- AMATEUR RADIO TECHNOLOGY AND MEASUREMENTS [5 Exam Questions -- 5 Groups] E4A Test equipment: analog and digital instruments; spectrum and network analyzers, antenna analyzers; oscilloscopes; testing transistors; RF measurements Oscilloscope Spectrum Analyzer E4A01 A spectrum analyzer differs from a conventional oscilloscope in that a spectrum analyzer displays signals in the frequency domain; an oscilloscope displays signals in the time domain. E4A02 A typical spectrum analyzer display would display Frequency on the horizontal axis. E4A03 A typical spectrum analyzer displays signal Amplitude on the vertical axis. E4A04 A spectrum analyzer can be used to display spurious signals from a radio transmitter. E4A05 A spectrum analyzer can be used to display intermodulation distortion products in an SSB transmission. Jack Tiley <strong>AD7FO</strong> Page 28 3/15/2009
Rev 2.02 E4A06 A spectrum analyzer could be used to determine the degree of isolation between the input and output ports of a 2 meter duplexer, whether a crystal is operating on its fundamental or overtone frequency, and the spectral output of a transmitter. E4A07 The advantage of using an antenna analyzer vs. a SWR bridge to measure antenna SWR is that Antenna analyzers typically do not need an external RF source. Noise Bridge Antenna Analyzers E4A08 An antenna analyzer would be best for measuring the SWR of a beam antenna. E4A09 Adjusting the ALC Level is most important when adjusting PSK31 transmitting levels. E4A10 A useful test for a functioning NPN transistor in an active circuit where the transistor should be biased "on" is to measure base-to-emitter voltage with a voltmeter; it should be approximately 0.6 to 0.7 volts. +0.7 V E4A11 A logic probe can be used to indicate pulse conditions in a digital logic circuit. E4A12 An important precaution to follow when connecting a spectrum analyzer to a transmitter output is to attenuate the transmitter output going to the spectrum analyzer [So that the Spectrum analyzer input is around -20 DBM (.000,010 watts) or less]. Excess power applied to the input of a spectrum analyzer, and for that matter many other test instruments, will cause expensive damage to the measuring instrument. Always think about this before connecting a transceiver (even an HT) to measurement equipment. It is good practice to place a 30 to 50 dB attenuator between the transmitter and the test equipment, E4B Measurement technique and limitations: instrument accuracy and performance limitations; probes; techniques to minimize errors; measurement of "Q"; instrument calibration Jack Tiley <strong>AD7FO</strong> Page 29 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: Rev 2.02 E3C01 Auroral activity cau
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 and 36: Rev 2.02 E4D11 Third-order intermod
Page 37 and 38: 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
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Rev 2.02 E7H19 A phase-locked loop
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Rev 2.02 E8A06 The approximate rati
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Rev 2.02 E8B13 In time division mul
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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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