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Serious ‘XM (aka W2XM) presents Exam-Prep Jepperdee: General-Class Edition 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 either a question or the Daily Double banner. 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 “semifinal jepperdee” and “FJ” means “final jepperdee;” proceed by clicking screen until you see the next hyperlink. There is one Daily Double on each board; click on “Here.” For most fun, appropriate hardware (lights, pushbuttons, sounder, lockout circuitry) should be used. A simple diagram is given on the next slide. Procedures & Practices Rules and Regulations Components and Circuits Radio Signals & Equipment 100 100 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500 500 500 500 . SFJ DIGITAL ANTENNAS & PROPAGATION ELECTRICAL & XMSN LINES RF SAFETY 100 100 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500 500 500 500 FJ G1B05 When may music be transmitted by an amateur station? When it is an incidental part of a manned space craft retransmission back What is the customary minimum frequency separation between SSB signals under normal condx? G2B05 Approximately 3 kHz back Why do most amateur stations use LSB on the 160meter, 75-meter, and 40-meter bands? G2A09 Current amateur practice is to use lower sideband on these frequency bands. back G2C03 What does it mean when a CW operator sends "KN" at the end of a transmission? Listening only for a specific station or stations back G2D08 What is a reason why many amateurs keep a station log? To help with a reply if the FCC requests information back Volunteer Examiners are accredited by what organization? G1D07 A Volunteer Examiner Coordinator back Which band allows communication on only specific channels, rather than frequency ranges? G1A04 60 meters back What are the restrictions on the use of abbreviations or procedural signals in the Amateur Service? G1B07 They may be used if they don’t obscure the meaning of a message. back What is the max. bandwidth for Am. Radio stns xmitting on USB frequencies in the 60-m band? G1C03 2.8 kHz back What types of msgs for a third party in another country may be transmitted by an amateur stn? G1E05 Only remarks of personal character, msgs about HamRadio, or msgs about emergencies or disaster relief back Why must the cases of some large power transistors be insulated from ground? G6A08 To avoid shorting the collector or drain voltage to ground back What is the total resistance of three 100-ohm resistors in parallel? G5C04 33.3 ohms back G5A02 What is reactance? Opposition to the flow of alternating current caused by capacitance or inductance back What item of test equipment contains horizontal and vertical channel amplifiers? G4B01 an oscilloscope back What would be the RMS voltage across a 50 ohm dummy load dissipating 1200 G5B12 watts? 245 volts back What’s the name of the process that varies the freq. of an RF wave to convey information? G8A03 Frequency modulation back For what mode is a Class C PA stage appropriate for a modulated signal? G7B11 CW back Assuming a ground rod is used, what might be the problem if you get RF burns by touching equipment which is transmitting on HF? G4C05 The ground wire has high impedance on that frequency back When using 3 kHz wide LSB, how close to the lower edge of the 40-m phone segment should your displayed carrier frequency be? G4D10 At least 3 kHz above the edge of the segment back What type of ckt is used in many FM receivers to convert signals coming from the IF amp. to audio? G7C08 Discriminator back When are messages sent via digital modes exempt from Part 97 third party rules that apply to other modes of communication? G1E12 Never back What segment of the 20-meter band is most often used for digital transmissions? G2E04 14.070 - 14.100 MHz back What is indicated on a waterfall display by one or more vertical lines adjacent to a PSK31 signal? G2E11 Overmodulation back G8B05 What is the approx. bandwidth of a PACTOR3 or WINMOR signal at maximum data rate? 2300 Hz back How does the receiving station respond to an ARQ data mode packet containing errors? G8C07 It requests the packet be retransmitted back What is the purpose of a corona ball on a HF mobile antenna? G4E02 To reduce high voltage discharge from the tip of the antenna back What is the purpose of a gamma match used with Yagi antennas? G9C11 To match the relatively low feed point impedance to 50 ohms back Where should the radial wires of a ground-mounted vertical antenna system be placed? G9B06 On the surface of the Earth or buried a few inches below the ground back What is an advantage of vertical stacking of horiz.-polarized Yagi antennas? G9D05 It narrows the main lobe in elevation back If the SWR on a feed line is 5:1, and a matching network at the xmitter is adjusted to a 1:1 SWR, what is the SWR on the feed line? G9A08 5 to 1 back What happens to signals with freq. below the MUF and above the LUF when they are sent into the ionosphere? G3B05 They are bent back to the Earth back G3C03 Why is the F2 region mainly responsible for the longest-distance radio propagation? Because it is the highest ionospheric region back G3A05 What is the solar flux index? A measure of solar radiation at 10.7 centimeters wavelength back G3B08 What does MUF stand for? The maximum usable frequency for communication between two points back What kind of propagation allows working a station too far for ground wave but too near for normal skywave propagation? G3C09 Scatter back G0B03 What size fuse or ckt breaker would be appropriate to use with a ckt that uses AWG # 14 wiring? 15 amperes back G0B12 What is the purpose of a power supply interlock? To ensure that dangerous voltages are removed if the cabinet is opened back What does "time averaging" mean in reference to RF radiation exposure? G0A04 The total RF exposure averaged over a certain time back What type of instrument can be used to accurately measure an RF field? G0A09 A calibrated field strength meter with a calibrated antenna back What precaution should you take when you make adjustments or repairs to an antenna? G0A12 Turn off the transmitter and disconnect the feed line back DAILY DOUBLE!!! Player makes wager; host clicks HERE for question. You missed! Try again. here DAILY DOUBLE!!! Player makes wager; host clicks HERE for question. You missed! Try again. here Semi-final Jepperdee TOPIC: NOMENCLATURE YOUR WAGER? (next click yields question) What is the name of the device used to match xmtr output impedance to a different impedance? G4A06 (Click here for THINK music.) What is the name of the device used to match xmtr output impedance to a different impedance? G4A06 (Click here for answer.) Antenna coupler or antenna tuner To game 2 board Final Jepperdee TOPIC: SAFETY YOUR WAGER? (next click yields question) Why shouldn’t soldered joints be used with the wires that connect the base of a tower to a system of ground rods? G0B09 (Click here for THINK music) Why shouldn’t soldered joints be used with the wires that connect the base of a tower to a system of ground rods? G0B09 (Click here for answer) A soldered joint will likely be destroyed by the heat of a lightning strike We hope Examprep Jepperdee was helpful! Comments? Suggestions?