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Serious ‘XM (That’s W2XM) presents Exam-prep Jepperdee: Extra-class Edition, v. 2 To prepare for the 2012 edition of the Extra exam Announcements: Introduction of presenter: Operation of the game is almost intuitive, and you can make up your own rules. Each numeric point value on either game board is a hyperlink which reveals a question. Advancing the game one slide past the question (by clicking the screen) displays the answer. “Back” on the answer slide returns you to the game board. “SFJ” stands for “semi-final jepperdee” and “FJ” means “final jepperdee;” proceed from SFJ or FJ by clicking the screen until you see the next hyperlink. There is one daily double on each board; click exactly on “Daily” or “Double” to see the question. For most fun, appropriate hardware (lights, push-buttons, sounder, lockout circuitry) should be used. A diagram is found at the end of this slide show. OPERATING PRACTICES RULES AND REGULATIONS ELECTRICAL PRINCIPALS COMPONENTS & BLDG BLOCKS 100 100 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500 500 500 500 SFJ Electronic Circuits Radio Sigs. Modes & Antennas/ & Msrmnts Equipment Propagation 100 100 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500 500 500 500 FJ Which data are used by the APRS network to communicate your location? E2D11 Latitude and longitude back Which of the following types of packet frames is used to transmit APRS beacon data? E2D08 Unnumbered Information back What type of satellite appears to stay in one position in the sky? E2A13 Geostationary back What is the orbital period of an Earth satellite? E2A03 the time it takes for the satellite to complete one rev. around the Earth; this depends on altitude back What is “selfspotting” in regards to contest operating? E2C02 The practice of posting one’s own call sign and freq. on a call sign spotting network back Is it legal to make a call using USB while your transceiver is displaying a “carrier” frequency of 14.349 MHz? E1A03 No; the sideband will extend beyond the band edge. back Within what distance must an amateur station protect an FCC monitoring facility from harmful interference? E1B03 1 mile back How are the control op responsibilities different for a station under automatic control and for one under local control? E1C03 Under automatic control, the control op is not required to be present at the control point back What is a telecommand station in the amateur satellite service? E1D03 An amateur station that sends signals to initiate, modify or end functions of a space station back What is a Volunteer Examiner Coordinator? E1E03 An organization that has entered into an agreement with FCC to coordinate license exams back What are the differences between the radiation from radioactive materials and the EM energy from an antenna? E0A01 Radioactive stuff emits ionizing radiation; RF signals are weaker and can only cause heating back What do the two numbers represent that are used to define a point on a graph using rectangular coordinates? E5C11 The coordinate values along the horizontal and vertical axes back What characteristic of a series-tuned circuit can be used as a relative indicator of its Q? E4B15 The bandwidth of the circuit's frequency response back What is the resonant freq. of a series RLC circuit if R is 56 ohms, L is 40 microhenrys and C is 200 pf? E5A15 1.78 MHz back Which point in the next slide represents the impedance of a series circuit consisting of a 300 ohm resistor and an 18 microhenry inductor at 3.505 MHz? E5C20 Point 3 Point 2 Point 8 Point 5 Point 6 Point 4 Point 7 Point 1 Point 3 back What’s the name given to an impurity atom that adds holes to a semiconductor crystal structure? E6A04 Acceptor impurity back What is one common use for PIN diodes? E6B12 As an RF switch back What is the main advantage of liquidcrystal display (LCD) devices over other types? E6D15 They consume less power. back What is an advantage of a period-measuring freq. counter over a direct-count type? E7F11 It gives improved resolution of lowfreq. signals within a comparable time period. back What is the approx. open-circuit voltage produced by a fully-illuminated Si photovoltaic cell? E6F11 0.5 volts back How can an RF power amplifier be neutralized? E7B08 By feeding a 180degree out-ofphase portion of the output back to the input back How does one insure that a xtal oscillator provides the frequency specified by the crystal mfr? E6E09 Provide the crystal with the specified parallel capacitance back What condition must exist for a circuit to oscillate? E7H02 It must have positive feedback with a gain greater than 1 back Why is Pi-L network better than a Pi for z matching btwn a vacuum-tube PA and the antenna? E7C03 Greater harmonic suppression back What is the purpose of C1 in the circuit shown in the next slide (Figure E7-3)? E7D09 Figure E7- 3 Q1 +25 C1 4000 C2 4000 +12 C3 0.01 R1 D1 R2 It filters the supply voltage. back What is the period of a wave? E8A08 The time required to complete one cycle back What is the RMS value of a 340-volt peak-to-peak pure sine wave? E8D16 120 V back Which of these factors most affects the accuracy of a frequency counter? E4B01 (next slide) A) Input attenuator accuracy; B) Time base accuracy; C) Decade divider accuracy; D) Temperature coefficient of logic Time base accuracy back What is one use for a pulse modulated signal? E8A11 Digital data transmission back What is one type of elec. interference that might be caused by the operation of a personal computer? E4E14 The appearance of unstable modulated or unmodulated signals at specific frequencies back Why are received spreadspectrum signals resistant to interference? E2C08 Signals not using the spectrumspreading algorithm are suppressed in the receiver back Which of these techniques causes a digital signal to appear as wide-band noise to a conventional rcvr? E8C09 (next slide) A) B) C) D) Spread-spectrum Independent s.b. Regenerative det. Exponential addition Spread-spectrum back How many times/sec is a new frame transmitted in a fast-scan (NTSC) t.v. system? E2B01 30 back What is an effect of excessive phase noise in the local oscillator section of a receiver? E4C01 It can cause strong signals on nearby frequencies to interfere with weak signals back What xmtr freqs. would cause an IMproduct signal in a rcvr tuned to 146.70 MHz when a nearby stn xmits on 146.52 MHz? E4D05 146.34 MHz and 146.61 MHz back How does the beamwidth of an antenna vary as the gain is increased? E9D03 It decreases back What are the disadvantages of a terminated rhombic antenna for the HF bands? E9C05 The antenna requires a large physical area and 4 separate supports. back What is an advantage of using a shielded loop antenna for direction finding? E9H12 It is electrostatically balanced against ground, giving better nulls. back What’s the approx. maximum separation between 2 stations QSOing by Moon bounce? E3A01 12,000 miles, as long as both can “see” the Moon back What 3rd family of circles is often added to a Smith chart while solving a problem? E9G09 Standing-wave ratio circles back Semi-final Jepperdee topic: ”satellite vocabulary” Your wager? What is the name of the location in a satellite’s orbit which is farthest from Earth? apogee (to second game board) Final Jepperdee topic: ”meteor-satter communications” How much will you risk? What range of amateur frequencies is well suited for meteor-scatter communications? E3A09 28 - 148 MHz Thanks for playing Exam-prep Jepperdee: Extra-class Edition, v. 2 The producer welcomes feedback………[email protected] return