serious ‘xm (that’s w2xm) presents
DESCRIPTION
Serious ‘XM (That’s W2XM) presents. Exam-prep Jepperdee : Extra-class Edition. Announcements Introduction of presenter. - PowerPoint PPT PresentationTRANSCRIPT
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Serious ‘XM(That’s W2XM)
presents
Exam-prep Jepperdee:
Extra-class Edition
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Announcements
Introduction of presenter
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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 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 screen until you see the next hyperlink. There is one daily double on each board; click on “Here’s the question.”
For most fun, appropriate hardware (lights, push-buttons, sounder, lockout circuitry) should be used. A diagram is available from the author.
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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
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Electronic Circuits
Radio Sigs. & Msrmnts
Modes & Equipment
Antennas/ Propagation
100 100 100 100
200 200 200 200
300 300 300 300
400 400 400 400
500 500 500 500 FJ
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E2C06 During a VHF-UHF contest, in which band segment would you expect to find the
highest level of activity?
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The weak-signal segment of the
band, with most of the activity near the
calling frequencyback
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E2C07
What is the Cabrillo format?
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A standard for submission of
electronic contest logs
back
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E2D07 Which digital protocol is used by
APRS: PACTOR, 802.11, AX.25, or
AMTOR?
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AX.25
back
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E2A02 What is the direction of a
descending pass for an amateur
satellite?
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From north to south
back
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E2A09 What do the terms L band and S band specify with regard to satellite communications?
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The 23-cm and 13-cm bands
back
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E1A05 What is the maximum power output permitted on the 60 meter
band?
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100 watts PEP effective radiated power relative to the gain of a half-
wave dipole back
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E1C01 What is a remotely
controlled station?
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A station controlled indirectly through a
control linkback
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E1D08 Which VHF amateur-service
bands have frequencies available
for space stations?
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2 meters
back
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E1F14 When/why might the FCC issue "Special Temporary Authority" (STA) to
an amateur station?
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To provide for experimental
amateur communications
back
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E1B05 What is the maximum
bandwidth for a data emission on
60 meters?
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2.8 kHz
back
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E6D08 Why use powdered-iron
toroids rather than ferrite ones in an
inductor?
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Powdered-iron toroids generally
maintain their characteristics at higher currents back
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E5B04 What is the time constant of a circuit having two 220-μF caps and two 1-MΩ res., all in parallel?
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220 seconds
back
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E5A08 What is the phase between the I through and the v across a series resonant circuit?
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The voltage and current are in
phaseback
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E5C04 Expressed in polar, what is the z of
a 400-Ω reactance cap in series with a
300-Ω resistor?
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500 ohms at an angle of -53.1
degreesback
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E5D12 How many watts are consumed in a
circuit having a p.f. of 0.2 if the input is 100-V AC at 4 A?
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80 watts
back
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E6A08 What do we call the freq. at which the grounded-base cur-
rent gain of a transis-tor is .7 X the gain at
1 kHz?
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alpha cutoff frequency
back
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E6E06 What charac-teristics of the MMIC
make it a good choice for VHF-
through-microwave circuits?
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Controlled gain, low noise figure, &
constant in and out Z’s over a given frequency rangeback
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E6D13 What type of CRT deflection is best
when high-frequency waveforms are to be
displayed?
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Electrostatic
back
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E6B04 What type of semiconductor
device is used as a voltage-controlled
capacitor?
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Varactor diode
back
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E6D06 What property of the core material determines the inductance of a
toroidal inductor?
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Permeability
back
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E7B12
What is this?
Figure E7-1
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Common emitter amplifier
back
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E6E10 What is the equivalent circuit
of a quartz crystal?
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Motional C, motional L, and loss R all in
series; with a shunt C representing elect-rode and stray C back
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E7H13 Define “capture range”
of a phase-locked loop circuit?
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The frequency range over which
the circuit can lockback
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E7C07 What kind of filter would attenuate an interfering signal as you are receiving an SSB transmission?
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A notch filter
back
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E7D13 Purpose of D1?
Figure E7- 3
C1 C3
+25 +12
R2R1
C2 D14000
4000 0.01
Q1
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To provide a voltage reference
back
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E8D15 What is the typ-ical nominal value for the RMS voltage at a standard household a.c. power outlet?
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120V
back
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E8A06 What is the approximate ratio of PEP-to-average power in a typical SSB phone signal?
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2.5 to 1
back
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E4A03 Which would a spectrum analyzer
display on the vertical axis: Amplitude,
Duration, SWR, or Q?
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Amplitude
back
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E8B08 What parameter is varied by the
modulating signal in a pulse-position
modulation system?
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The time at which each pulse occurs
back
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E4E07 How can you determine if line-
noise interference is being generated
within your home?
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By turning off the AC-power main
breaker and listen-ing on a battery operated radio back
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E2D12 How does JT65 improve EME
communications?
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It can decode signals many dB below the noise floor using FEC
back
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E8C05 What is the necessary bandwidth
of a 13-WPM international Morse code transmission?
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Approximately 52 Hz
back
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E2B09 What hardware, besides a receiver & computer, is needed to decode SSTV using
Digital Radio Mondiale
(DRM)?
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No other hardware is
needed
back
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E4C04 What is the definition of the “noise figure” of
a receiver?
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The ratio of the noise generated by the receiver to the theoretical mini-mum noise (in dB)
back
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E6E05 What noise figure value might
be typical of a low-noise UHF
preamplifier?
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2 dB
back
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E9A09 What is meant by antenna bandwidth?
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The frequency range over which
an antenna satisfies a performance requirement
back
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E9D13 What happens to Z at the feed point of a fixed-length ant. as
the frequency of operation is lowered?
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The radiation resis-tance decreases &
the capacitive reactance increases. back
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E9F06 What is the approx. length of an air-insulated parallel conductor xmission
line that is λ/2 long at 14.1 MHz?
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10 meters
back
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E3B02 What is the approx. maximum range for signals
using transequatorial propagation?
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5000 miles
back
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E0A07 How may dan-gerous levels of car-bon monoxide from
an emergency gener-ator be detected?
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Only with a carbon monoxide detector
back
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Semi-final Jepperdee
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topic:A.C. waveform
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For a sinusoidal voltage, how do
the peak and rms values compare?
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peak voltage = 1.414 X rms voltage
ORVrms = .707 X Vpeak
(to second game board)
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Final Jepperdee
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topic:hazardous materials
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E0A09 Which insulating material used as a
thermal conductor is extremely toxic if
broken or crushed and accidentally inhaled?
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Beryllium Oxide
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Thanks for playingExam-prep Jepperdee:Extra-class
Edition