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Serious XM (aka W2XM) presents Exam-Prep Jepperdee: General-Class Edition

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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 semi- final 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, push- buttons, sounder, lockout circuitry) should be used. A simple diagram is given on the next slide.

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Procedures & Practices Rules and Regulations Components and Circuits Radio Signals & Equipment 100 200 300 400 500 500. 500 SFJ

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DIGITALANTENNAS & XMSN LINES PROPAGATION ELECTRICAL & RF SAFETY 100 200 300 400 500 FJ FJ

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G1B05 When may music be transmitted by an amateur station?

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back When it is an incidental part of a manned space craft retransmission

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G2B05 What is the customary minimum frequency separation between SSB signals under normal condx?

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back Approximately 3 kHz

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G2A09 Why do most amateur stations use LSB on the 160- meter, 75-meter, and 40-meter bands?

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back Current amateur practice is to use lower sideband on these frequency bands.

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G2C03 What does it mean when a CW operator sends "KN" at the end of a transmission?

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back Listening only for a specific station or stations

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G2D08 What is a reason why many amateurs keep a station log?

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back To help with a reply if the FCC requests information

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G1D07 Volunteer Examiners are accredited by what organization?

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back A Volunteer Examiner Coordinator

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G1A04 Which band allows communication on only specific channels, rather than frequency ranges?

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back 60 meters

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G1B07 What are the re- strictions on the use of abbreviations or procedural signals in the Amateur Service?

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back They may be used if they dont obscure the meaning of a message.

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G1C03 What is the max. bandwidth for Am. Radio stns xmitting on USB frequencies in the 60-m band?

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back 2.8 kHz

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G1E05 What types of msgs for a third party in another country may be transmitted by an amateur stn?

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back Only remarks of per- sonal character, msgs about HamRadio, or msgs about emergen- cies or disaster relief

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G6A08 Why must the cases of some large power transistors be insulated from ground?

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back To avoid shorting the collector or drain voltage to ground

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G5C04 What is the total resistance of three 100-ohm resistors in parallel?

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back 33.3 ohms

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G5A02 What is reactance ?

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back Opposition to the flow of alternating current caused by capacitance or inductance

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G4B01 What item of test equipment contains horizontal and vertical channel amplifiers?

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back an oscilloscope

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G5B12 What would be the RMS voltage across a 50 ohm dummy load dissipating 1200 watts?

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back 245 volts

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G8A03 Whats the name of the process that varies the freq. of an RF wave to convey information?

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back Frequency modulation

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G7B11 For what mode is a Class C PA stage appropriate for a modulated signal?

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back CW

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G4C05 Assuming a ground rod is used, what might be the problem if you get RF burns by touch- ing equipment which is transmitting on HF?

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back The ground wire has high impedance on that frequency

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G4D10 When using 3 kHz wide LSB, how close to the lower edge of the 40-m phone segment should your displayed carrier frequency be?

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back At least 3 kHz above the edge of the segment

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G7C08 What type of ckt is used in many FM receivers to convert signals coming from the IF amp. to audio?

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back Discriminator

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G1E12 When are messages sent via digital modes exempt from Part 97 third party rules that apply to other modes of communication?

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back Never

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G2E04 What segment of the 20-meter band is most often used for digital transmissions?

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back 14.070 - 14.100 MHz

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G2E11 What is indicated on a waterfall display by one or more vertical lines adjacent to a PSK31 signal?

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back Overmodulation

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G8B05 What is the approx. bandwidth of a PACTOR3 or WINMOR signal at maximum data rate?

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back 2300 Hz

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G8C07 How does the receiving station respond to an ARQ data mode packet containing errors ?

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back It requests the packet be retransmitted

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G4E02 What is the purpose of a corona ball on a HF mobile antenna?

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back To reduce high voltage discharge from the tip of the antenna

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G9C11 What is the purpose of a gamma match used with Yagi antennas?

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back To match the relatively low feed point impedance to 50 ohms

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G9B06 Where should the radial wires of a ground-mounted vertical antenna system be placed?

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back On the surface of the Earth or buried a few inches below the ground

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G9D05 What is an advantage of vertical stacking of horiz.-polarized Yagi antennas?

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back It narrows the main lobe in elevation

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G9A08 If the SWR on a feed line is 5:1, and a match- ing network at the xmitter is adjusted to a 1:1 SWR, what is the SWR on the feed line?

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back 5 to 1

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G3B05 What happens to signals with freq. below the MUF and above the LUF when they are sent into the ionosphere?

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back They are bent back to the Earth

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G3C03 Why is the F2 region mainly responsible for the longest-distance radio propagation?

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back Because it is the highest ionospheric region

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G3A05 What is the solar flux index?

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back A measure of solar radiation at 10.7 centimeters wavelength

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G3B08 What does MUF stand for?

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back The maximum usable frequency for communication between two points

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G3C09 What kind of prop- agation allows working a station too far for ground wave but too near for normal sky- wave propagation?

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back Scatter

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G0B03 What size fuse or ckt breaker would be appropriate to use with a ckt that uses AWG # 14 wiring?

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back 15 amperes

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G0B12 What is the purpose of a power supply interlock?

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back To ensure that dangerous voltages are removed if the cabinet is opened

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G0A04 What does "time averaging" mean in reference to RF radiation exposure?

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back The total RF exposure averaged over a certain time

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G0A09 What type of instrument can be used to accurately measure an RF field?

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back A calibrated field strength meter with a calibrated antenna

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G0A12 What precaution should you take when you make ad- justments or re- pairs to an antenna ?

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back Turn off the transmitter and disconnect the feed line

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DAILY DOUBLE!!! Player makes wager; host clicks HERE for question. HERE

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You missed! Try again. here

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DAILY DOUBLE!!! Player makes wager; host clicks HERE for question. HERE

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You missed! Try again. here

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Semi-final Jepperdee TOPIC: NOMENCLATURE YOUR WAGER? (next click yields question)

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G4A06 What is the name of the device used to match xmtr output impedance to a different impedance? (Click here for THINK music.)

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G4A06 What is the name of the device used to match xmtr output impedance to a different impedance? (Click here for answer.)

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Antenna coupler or antenna tuner To game 2 board

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Final Jepperdee TOPIC: SAFETY YOUR WAGER? (next click yields question)

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G0B09 Why shouldnt soldered joints be used with the wires that connect the base of a tower to a system of ground rods? (Click here for THINK music)

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G0B09 Why shouldnt soldered joints be used with the wires that connect the base of a tower to a system of ground rods? (Click here for answer)

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A soldered joint will likely be destroyed by the heat of a lightning strike

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We hope Exam- prep Jepperdee was helpful! Comments? Suggestions?