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Amateur Radio Question PoolsNew! View the differences between the 2008 Extra question pool and the previous pool. Amateur Extra Class Question PoolPrev 1 2 3 4 5 6 7 8 9 0 NextE3A01 What is the maximum separation between two stations communicating by moon bounce? 500 miles maximum, if the moon is at perigee 2000 miles maximum, if the moon is at apogee 5000 miles maximum, if the moon is at perigee Any distance as long as the stations have a mutual lunar window E3A02 What characterizes libration fading of an earth-moon-earth signal? A slow change in the pitch of the CW signal A fluttery irregular fading A gradual loss of signal as the sun rises The returning echo is several hertz lower in frequency than the transmitted signal E3A03 When scheduling EME contacts, which of these conditions will generally result in the least path loss? When the moon is at perigee When the moon is full When the moon is at apogee When the MUF is above 30 MHz E3A04 What type of receiving system is desirable for EME communications? Equipment with very low power output Equipment with very low dynamic range Equipment with very low gain Equipment with very low noise figures E3A05 What transmit and receive time sequencing is normally used on 144 MHz when attempting an earth-moon-earth contact? Two-minute sequences, where one station transmits for a full two minutes and then receives for the following two minutes One-minute sequences, where one station transmits for one minute and then receives for the following one minute Two-and-one-half minute sequences, where one station transmits for a full 2.5 minutes and then receives for the following 2.5 minutes Five-minute sequences, where one station transmits for five minute sand then receives for the following five minutes E3A06 What transmit and receive time sequencing is normally used on 432 MHz when attempting an EME contact? Two-minute sequences, where one station transmits for a full two minutes and then receives for the following two minutes One-minute sequences, where one station transmits for one minute and then receives for the following one minute Two and one half minute sequences, where one station transmits for a full 2.5 minutes and then receives for the following 2.5 minutes Five minute sequences, where one station transmits for five minute sand then receives for the following five minutes E3A07 What frequency range would you normally tune to find EME stations in the 2-meter band? 144.000 - 144.001 MHz 144.000 - 144.100 MHz 144.100 - 144.300 MHz 145.000 - 145.100 MHz E3A08 What frequency range would you normally tune to find EME stations in the 70-cm band? 430.000 - 430.150 MHz 430.100 - 431.100 MHz 431.100 - 431.200 MHz 432.000 - 432.100 MHz E3A09 When a meteor strikes the earth's atmosphere, a cylindrical region of free electrons is formed at what layer of the ionosphere? The E layer The F1 layer The F2 layer The D layer E3A10 Which range of frequencies is well suited for meteor-scatter communications? 1.8 - 1.9 MHz 10 - 14 MHz 28 - 148 MHz 220 - 450 MHz E3A11 What transmit and receive time sequencing is normally used on 144 MHz when attempting a meteor-scatter contact? Two-minute sequences, where one station transmits for a full two minutes and then receives for the following two minutes One-minute sequences, where one station transmits for one minute and then receives for the following one minute 15-second sequences, where one station transmits for 15 seconds and then receives for the following 15 seconds 30-second sequences, where one station transmits for 30 seconds and then receives for the following 30 seconds E3B01 What is transequatorial propagation? Propagation between two points at approximately the same distance north and south of the magnetic equator Propagation between two points at approximately the same latitude on the magnetic equator Propagation between two continents by way of ducts along the magnetic equator Propagation between two stations at the same latitude E3B02 What is the approximate maximum range for signals using transequatorial propagation? 1000 miles 2500 miles 5000 miles 7500 miles E3B03 What is the best time of day for transequatorial propagation? Morning Noon Afternoon or early evening Late at night E3B04 What type of propagation is probably occurring if an HF beam antenna must be pointed in a direction 180 degrees away from a station to receive the strongest signals? Long-path Sporadic-E Transequatorial Auroral E3B05 On what amateur bands can long-path propagation provide signal enhancement? 160 to 40 meters 30 to 10 meters 160 to 10 meters 6 meters to 2 meters E3B06 What amateur band consistently yields long-path enhancement using a modest antenna of relatively high gain? 80 meters 20 meters 10 meters 6 meters E3B07 What is the typical reason for hearing an echo on the received signal of a station in Europe while directing your HF antenna toward the station? The station's transmitter has poor frequency stability The station's transmitter is producing spurious emissions Auroral conditions are causing a direct and a long-path reflected signal to be received There are two signals being received, one from the most direct path and one from long-path propagation E3B08 What type of propagation is probably occurring if radio signals travel along the terminator between daylight and darkness? Transequatorial Sporadic-E Long-path Gray-line E3B09 At what time of day is gray-line propagation most prevalent? Twilight, at sunrise and sunset When the sun is directly above the location of the transmitting station When the sun is directly overhead at the middle of the communications path between the two stations When the sun is directly above the location of the receiving station E3B10 What is the cause of gray-line propagation? At midday the sun, being directly overhead, superheats the ionosphere causing increased refraction of radio waves At twilight solar absorption drops greatly while atmospheric ionization is not weakened enough to reduce the MUF At darkness solar absorption drops greatly while atmospheric ionization remains steady At mid afternoon the sun heats the ionosphere, increasing radio wave refraction and the MUF E3B11 What communications are possible during gray-line propagation? Contacts up to 2,000 miles only on the 10-meter band Contacts up to 750 miles on the 6- and 2-meter bands Contacts up to 8,000 to 10,000 miles on three or four HF bands Contacts up to 12,000 to 15,000 miles on the 2 meter and 70centimeter bands E3C01 What effect does auroral activity have upon radio communications? The readability of SSB signals increases FM communications are clearer CW signals have a clearer tone CW signals have a fluttery tone E3C02 What is the cause of auroral activity? A high sunspot level A low sunspot level The emission of charged particles from the sun Meteor showers concentrated in the northern latitudes E3C03 Where in the ionosphere does auroral activity occur? At F-region height In the equatorial band At D-region height At E-region height E3C04 Which emission mode is best for auroral propagation? CW SSB FM RTTY E3C05 What causes selective fading? Small changes in beam heading at the receiving station Phase differences between radio-wave components of the same transmission, as experienced at the receiving station Large changes in the height of the ionosphere at the receiving station ordinarily occurring shortly after either sunrise or sunset Time differences between the receiving and transmitting stations E3C06 How does the bandwidth of a transmitted signal affect selective fading? It is more pronounced at wide bandwidths It is more pronounced at narrow bandwidths It is the same for both narrow and wide bandwidths The receiver bandwidth determines the selective fading effect E3C07 How much farther does the VHF/UHF radio-path horizon distance exceed the geometric horizon? By approximately 15% of the distance By approximately twice the distance By approximately one-half the distance By approximately four times the distance E3C08 For a 3-element beam antenna with horizontally mounted elements, how does the main lobe takeoff angle vary with height above flat ground? It increases with increasing height It decreases with increasing height It does not vary with height It depends on E-region height, not antenna height E3C09 What is the name of the high-angle wave in HF propagation that travels for some distance within the F2 region? Oblique-angle ray Pedersen ray Ordinary ray Heaviside ray E3C10 What effect is usually responsible for propagating a VHF signal over 500 miles? D-region absorption Faraday rotation Tropospheric ducting Moonbounce E3C11 For a 3-element beam antenna with horizontally mounted elements, how does the main lobe takeoff angle vary with the downward slope of the ground (moving away from the antenna)? It increases as the slope gets steeper It decreases as the slope gets steeper It does not depend on the ground slope It depends of the F-region height E3C12 In the northern hemisphere, in which direction should a directional antenna be pointed to take maximum advantage of auroral propagation? South North East West E3C13 As the frequency of a signal is increased, how does its ground wave propagation change? It increases It decreases It stays the same Radio waves don't propagate along the earth's surface E3C14 What typical propagation does ground-wave propagation have? Vertical Horizontal Circular Elliptical E3C15 Why does the radio-path horizon distance exceed the geometric horizon? E-region skip D-region skip Auroral skip Radio waves may be bent |
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