3BA-3.2 20NWhat is the maximum transmitting power permitted an amateur station on 10.14 MHz? 200 Watts PEP output 1000 Watts DC input 1500 Watts PEP output 2000 Watts DC input A3BA-3.3 20NWhat is the maximum transmitting power permitted an amateur station on 3725 kHz? 200 watts PEP output 1000 watts DC input 1500 watts PEP output 2000 watts DC input A3BA-3.4 20NWhat is the maximum transmitting power permitted an amateur station on 7080 kHz? 200 watts PEP output 1000 watts DC input 1500 watts PEP output 2000 watts DC input C3BA-3.5 20NWhat is the maximum transmitting power permitted an amateur station on 24.95 MHz? 200 watts PEP output 1000 watts DC input 1500 watts PEP output 2000 watts DC input C3BA-3.7 20NWhat is the maximum transmitting power permitted an amateur station transmitting on 21.150 MHz? 200 watts PEP output 1000 watts DC input 1500 watts DC input 1500 watts PEP output A3BA-4.1 21NHow must a General control operator at a Novice station make the station identification when transmitting on 7050 kHz in ITU Region 2? The control operator should identify the station with his or her call, followed by the word "Controlling" and the Novice call The control operator should identify the station with his or her call, followed by the slant mark "/" (or any suitable word) and the Novice call The control operator should identify the station with the Novice call, followed by the slant mark "/" (or any suitable word) and his or her own call A Novice station should not be operated on 7050 kHz, even with a General class control operator C3BA-4.3 21NHow must a control operator who has a Technician class license and a "Certificate of Successful Completion of Examination" for General class privileges identify the station when transmitting on 14.325 MHz? (Assume telephony) General-class privileges do not include 14.325 MHz No special form of identification is needed The operator shall give his/her call sign, followed by "slant mark" or any suitable word that denotes the slant mark and the identifier "AG" The operator shall give his/her call sign, followed by the date and location of the VEC examination where he/she obtained the upgraded license C3BA-6.1 21NUnder what circumstances, if any, may third-party communications be transmitted to a foreign country by an amateur station where the third party is not eligible to be a control operator of the station? Under no circumstances Only if the country has a third-party communications agreement with the United States Only if the control operator is an Amateur Extra class licensee Only if the country has formal diplomatic relations with the United states B3BA-6.2 22NWhat types of messages may be transmitted by an amateur station to a foreign country for a third-party? Third-party communications involving material compensation, either tangible or intangible, direct or indirect, to a third party, a station licensee, a control operator, or any other personThird-party communications facilitating the business affairs of any party Third-party communications limited to messages of a technical nature or remarks of a personal character No messages may be transmitted to foreign countries for third parties C3BA-6.6 22NWhich of the following limitations apply to third-party messages transmitted to foreign countries where the third party is not eligible to be a control operator of the station? Third-party messages may only be transmitted to amateurs in countries with which the US has a third-party communications agreement Third-party messages may only be sent to amateurs in ITU Region 1 Third-party messages may only be sent to amateurs in ITU Region 3 Third-party messages must always be transmitted in English A3BA-8.6 22NUnder what circumstances, if any, may an amateur station transmitting on 29.64 MHz repeat the 146.34 MHz signals of an amateur station with a Technician control operator? Under no circumstances Only if the station on 29.64 MHz is operating under a Special Temporary Authorization allowing such retransmission Only during an FCC-declared general state of communications emergency Only if the control operator of the repeater transmitter is authorized to operate on 29.64 MHz D3BA-9.1 23NWhat frequency privileges are authorized to General operators in the 160-meter wavelength band? 1800 to 1900 kHz only 1900 to 2000 kHz only 1800 to 2000 kHz only 1825 to 2000 kHz only C3BA-9.2 23NWhat frequency privileges are authorized to General operators in the 75/80 meter wavelength band? 3525 to 3750 and 3850 to 4000 kHz only 3525 to 3775 and 3875 to 4000 kHz only 3525 to 3750 and 3875 to 4000 kHz only 3525 to 3775 and 3850 to 4000 kHz only A3BA-9.3 23NWhat frequency privileges are authorized to General operators in the 40-meter wavelength band? 7025 to 7175 and 7200 to 7300 kHz only 7025 to 7175 and 7225 to 7300 kHz only 7025 to 7150 and 7200 to 7300 kHz only 7025 to 7150 and 7225 to 7300 kHz only D3BA-9.4 23NWhat frequency privileges are authorized to General operators in the 30-meter wavelength band? 10,100 to 10,150 kHz only 10,105 to 10,150 kHz only 10,125 to 10,150 kHz only 10,100 to 10,125 kHz only A3BA-9.5 24NWhat frequency privileges are authorized to General operators in the 20-meter wavelength band? 14,025 to 14,100 and 14,175 to 14,350 kHz only 14,025 to 14,150 and 14,225 to 14,350 kHz only 14,025 to 14,125 and 14,200 to 14,350 kHz only 14,025 to 14,175 and 14,250 to 14,350 kHz only B3BA-9.6 24NWhat frequency privileges are authorized to General operators in the 15-meter wavelength band? 21,025 to 21,200 and 21,275 to 21,450 kHz only 21,025 to 21,150 and 21,300 to 21,450 kHz only 21,025 to 21,200 and 21,300 to 21,450 kHz only 21,000 to 21,150 and 21,275 to 21,450 kHz only C3BA-9.7 24NWhat frequency privileges are authorized to General operators in the 12-meter wavelength band? 24,890 to 24,990 kHz only 24,890 to 24,975 kHz only 24,900 to 24,990 kHz only 24,790 to 24,990 kHz only A3BA-9.8 24NWhat frequency privileges are authorized to General operators in the 10-meter wavelength band? 28,000 to 29,700 kHz only 28,025 to 29,700 kHz only 28,100 to 29,700 kHz only 28,025 to 29,600 kHz only A3BA-9.9 25NWhich operator licenses authorize privileges on 1820-kHz? Extra only Extra, Advanced only Extra, Advanced, General only Extra, Advanced, General, Technician only C3BA-9.10 25NWhich operator licenses authorize privileges on 3950-kHz? Extra, Advanced only Extra, Advanced, General only Extra, Advanced, General, Technician only Extra, Advanced, General, Technician, Novice only B3BA-9.11 25NWhich operator licenses authorize privileges on 7230-kHz? Extra only Extra, Advanced only Extra, Advanced, General only Extra, Advanced, General, Technician only C3BA-9.12 25NWhich operator licenses authorize privileges on 10.125-MHz? Extra, Advanced, General only Extra, Advanced only Extra only Technician only A3BA-9.13 25NWhich operator licenses authorize privileges on 14.325-MHz? Extra, Advanced, General, Technician only Extra, Advanced, General only Extra, Advanced only Extra only B3BA-9.14 25NWhich operator licenses authorize privileges on 21.425-MHz? Extra, Advanced, General, Novice only Extra, Advanced, General, Technician only Extra, Advanced, General only Extra, Advanced only C3BA-9.15 26NWhich operator licenses authorize privileges on 24.895-MHz? Extra only Extra, Advanced only Extra, Advanced, General only None C3BA-9.16 26NWhich operator licenses authorize privileges on 29.616-MHz? Novice, Technician, General, Advanced, Extra only Technician, General, Advanced, Extra only General, Advanced, Extra only Advanced, Extra only C3BA-10.1 26NOn what frequencies within the 160-meter wavelength band may phone emissions be transmitted? 1800 - 2000 kHz only 1800 - 1900 kHz only 1900 - 2000 kHz only 1825 - 1950 kHz only A3BA-10.2 27NOn what frequencies within the 80-meter wavelength band may CW emissions be transmitted? 3500 - 3750 kHz only 3700 - 3750 kHz only 3500 - 4000 kHz only 3890 - 4000 kHz only C3BA-10.3 27NOn what frequencies within the 40-meter wavelength band may image emissions be transmitted? 7225 - 7300 kHz only 7000 - 7300 kHz only 7100 - 7150 kHz only 7150 - 7300 kHz only D3BA-10.4 27NOn what frequencies within the 30-meter wavelength band may RTTY emissions be transmitted? 10.140 - 10.150 MHz only 10.125 - 10.150 MHz only 10.100 - 10.150 MHz only 10.100 - 10.125 MHz only C3BA-10.5 27NOn what frequencies within the 20-meter wavelength band may image emissions be transmitted? 14,200 - 14,300 kHz only 14,150 - 14,350 kHz only 14,025 - 14,150 kHz only 14,150 - 14,300 kHz only B3BA-10.6 27NOn what frequencies within the 15-meter wavelength band may image emissions be transmitted? 21,200 - 21,300 kHz only 21,350 - 21,450 kHz only 21,200 - 21,450 kHz only 21,100 - 21,200 kHz only C3BA-10.7 28NOn what frequencies within the 12-meter wavelength band may phone emissions be transmitted? 24,890 - 24,990 kHz only 24,890 - 24,930 kHz only 24,930 - 24,990 kHz only Phone emissions are not permitted in this band C3BA-10.8 28NOn what frequencies within the 10-meter wavelength band may phone emissions be transmitted? 28,000 - 28,300 kHz only 29,000 - 29,700 kHz only 28,300 - 29,700 kHz only 28,000 - 29,000 kHz only C3BA-13.1 28NWhat is the maximum sending speed permitted for data emissions below 28 MHz? 56 kilobauds 19.6 kilobauds 300 bauds 1200 bauds C3BA-13.2 28NWhat is the maximum sending speed permitted for RTTY emissions below 28 MHz? 56 kilobauds 19.6 kilobauds 1200 bauds 300 bauds D3BA-14.3 28NUnder what circumstances, if any, may an amateur station engage in some form of broadcasting? During severe storms, amateurs may broadcast weather information for people with scanners Under no circumstances If power levels under one watt are used, amateur stations may broadcast information bulletins, but not music Amateur broadcasting is permissible above 10 GHz B3BA-14.6 29NWhich of the following is NOT a condition that allows an amateur station to engage in news gathering for broadcast purposes? The information is more quickly transmitted by Amateur Radio The information involves the immediate safety of life of individuals or the immediate protection of property The information is directly related to the event The information cannot be transmitted by other means A3BA-15.1 29NUnder what circumstances, if any, may the playing of a violin be transmitted by an amateur station? When the music played produces no dissonances or spurious emissions When it is used to jam an illegal transmission Only above 1215 MHz Transmitting music is not permitted in the Amateur Service D3BA-15.3 29NUnder what circumstances, if any, may the playing of a piano be transmitted by an amateur station? When it is used to jam an illegal transmission Only above 1215 MHz Transmitting music is not permitted in the Amateur Service When the music played produces no dissonances or spurious emissions C3BA-15.4 29NUnder what circumstances, if any, may the playing of a harmonica be transmitted by an amateur station? When the music played produces no dissonances or spurious emissions Transmitting music is not permitted in the Amateur Service When it is used to jam an illegal transmission Only above 1215 MHz B3BA-16.1 29NUnder what circumstances, if any, may an amateur station in two-way communication transmit a message in a secret code in order to obscure the meaning of the communication? Only above 450 MHz Only on Field Day Never Only during a declared communications emergency C3BA-16.2 30NIn an amateur communication, what types of abbreviations or procedural signals are not considered codes or ciphers? Abbreviations and procedural signals certified by the ARRL Abbreviations and signals established by regulation or custom and usage and whose intent is to facilitate communication and not to obscure meaning No abbreviations are permitted, as they tend to obscure the meaning of the message to FCC monitoring stations Only "10 Codes" are permitted B3BA-16.3 30NWhen, if ever, are codes and ciphers permitted in two-way domestic Amateur Radio communications? Codes or ciphers are prohibited under all circumstances Codes or ciphers are permitted during ARRL-sponsored contests Codes or ciphers are permitted during nationally declared emergencies Codes or ciphers are permitted above 2.3 GHz A3BA-16.4 31NWhen, if ever, are codes or ciphers permitted in two-way international Amateur Radio communications? Codes or ciphers are prohibited under all circumstances Codes or ciphers are permitted during ITU-sponsored DX contests Codes or ciphers are permitted during internationally declared emergencies Codes or ciphers are permitted only on frequencies above 2.3 GHz A3BB-1.4 31NWhat is meant by the term FLATTOPPING in a single-sideband phone transmission? Signal distortion caused by insufficient collector current The transmitter's automatic level control is properly adjusted Signal distortion caused by excessive drive The transmitter's carrier is properly suppressed C3BB-1.5 31NHow should the microphone gain control be adjusted on a single-sideband phone transmitter? For full deflection of the ALC meter on modulation peaks For slight movement of the ALC meter on modulation peaks For 100% frequency deviation on modulation peaks For a dip in plate current B3BB-2.1 31NIn what segment of the 20-meter wavelength band do most RTTY transmissions take place? Between 14.000 and 14.050 MHz Between 14.075 and 14.100 MHz Between 14.150 and 14.225 MHz Between 14.275 and 14.350 MHz B3BB-2.2 32NIn what segment of the 80-meter wavelength band do most RTTY transmissions take place? 3.610 to 3.630 MHz 3500 to 3525 kHz 3700 to 3750 kHz 3.775 to 3.825 MHz A3BB-2.3 32NWhat is meant by the term BAUDOT? Baudot is a 7-bit code, with start, stop and parity bits Baudot is a 7-bit code in which each character has four mark and three space bits Baudot is a 5-bit code, with additional start and stop bits Baudot is a 6-bit code, with additional start, stop and parity bits C3BB-2.4 32NWhat is meant by the term ASCII? ASCII is a 7-bit code, with additional start, stop and parity bits ASCII is a 7-bit code in which each character has four mark and three space bits ASCII is a 5-bit code, with additional start and stop bits ASCII is a 5-bit code in which each character has three mark and two space bits A3BB-2.6 33NWhat is the most common frequency shift for RTTY emissions in the amateur HF bands? 85 Hz 170 Hz 425 Hz 850 Hz B3BB-2.10 33NWhat are the two subset modes of AMTOR? A mark of 2125 Hz and a space of 2295 Hz Baudot and ASCII ARQ and FEC USB and LSB C3BB-2.11 34NWhat is the meaning of the term ARQ? Automatic Repeater Queue Automatic Receiver Quieting Automatically Resend Quickly Automatic Repeat Request D3BB-2.12 34NWhat is the meaning of the term FEC? Frame Error Check Forward Error Correction Frequency Envelope Control Frequency Encoded Connection B3BB-3.8 34NWhat is a BAND PLAN? An outline adopted by Amateur Radio operators for operating within a specific portion of radio spectrum An arrangement for deviating from FCC Rules and Regulations A schedule for operating devised by the Federal Communications Commission A plan devised for a club on how best to use a band during a contest A3BB-3.12 34NWhat is the usual input/output frequency separation for a 10 meter station in repeater operation? 100 kHz 600 kHz 1.6 MHz 170 Hz A3BB-4.1 34NWhat is meant by the term VOX TRANSMITTER CONTROL? Circuitry that causes the transmitter to transmit automatically when the operator speaks into the microphone Circuitry that shifts the frequency of the transmitter when the operator switches from radiotelegraphy to radiotelephony Circuitry that activates the receiver incremental tuning in a transceiver Circuitry that isolates the microphone from the ambient noise level A3BB-4.2 35NWhat is the common name for the circuit that causes a transmitter to automatically transmit when a person speaks into the microphone? VXO VOX VCO VFO B3BB-5.1 35NWhat is meant by the term FULL BREAK-IN TELEGRAPHY? A system of radiotelegraph communication in which the breaking station sends the Morse Code symbols BK A system of radiotelegraph communication in which only automatic keyers can be used A system of radiotelegraph communication in which the operator must activate the send-receive switch after completing a transmission A system of radiotelegraph communication in which the receiver is sensitive to incoming signals between transmitted key pulses D3BB-5.2 35NWhat Q signal is used to indicate full break-in telegraphy capability? QSB QSF QSK QSV C3BB-6.1 35NWhen selecting an CW transmitting frequency, what is the minimum frequency separation from a QSO in progress that should be allowed in order to minimize interference? 5 to 50 Hz 150 to 500 Hz Approximately 3 kHz Approximately 6 kHz B3BB-6.2 35NWhen selecting a single-sideband phone transmitting frequency, what is the minimum frequency separation from a QSO in progress that should be allowed in order to minimize interference? 150 to 500 Hz between suppressed carriers Approximately 3 kHz between suppressed carriers Approximately 6 kHz between suppressed carriers Approximately 10 kHz between suppressed carriers B3BB-6.3 36NWhen selecting a RTTY transmitting frequency, what is the minimum frequency separation from a QSO in progress that should be allowed in order to minimize interference? Approximately 45 Hz center to center Approximately 250 to 500 Hz center to center Approximately 3 kHz center to center Approximately 6 kHz center to center B3BB-7.1 36NWhat is an AZIMUTHAL map? A map projection that is always centered on the North Pole A map projection, centered on a particular location, that determines the shortest path between two points on the surface of the earth A map that shows the angle at which an amateur satellite crosses the equator A map that shows the number of degrees longitude that an amateur satellite appears to move westward at the equator with each orbit B3BB-7.2 36NHow can an azimuthal map be helpful in conducting international HF radio communications? It is used to determine the proper beam heading for the shortest path to a DX station It is used to determine the most efficient transmitting antenna height to conduct the desired communication It is used to determine the angle at which an Amateur satellite crosses the equator It is used to determine the maximum usable frequency (MUF) A3BB-7.3 36NWhat is the most useful type of map when orienting a directional antenna toward a station 5,000 miles distant? Azimuthal Mercator Polar projection Topographical A3BB-7.4 37NA directional antenna pointed in the long-path direction to another station is generally oriented how many degrees from the short-path heading? 45 degrees 90 degrees 180 degrees 270 degrees C3BB-7.5 37NWhat is the short-path heading to Antarctica? Approximately 0 degrees Approximately 90 degrees Approximately 180 degrees Approximately 270 degrees C3BB-8.1 37NWhen permitted, transmissions to amateur stations in another country must be limited to only what type of messages? Messages of any type are permitted Messages that compete with public telecommunications services Messages of a technical nature or remarks of a personal character of relative unimportance Such transmissions are never permitted C3BB-8.2 37NIn which International Telecommunication Union Region is the continental United States? Region 1 Region 2 Region 3 Region 4 B3BB-8.3 38NIn which International Telecommunication Union Region is Alaska? Region 1 Region 2 Region 3 Region 4 B3BB-8.4 38NIn which International Telecommunication Union Region is American Samoa? Region 1 Region 2 Region 3 Region 4 C3BB-8.5 38NFor uniformity in international radio communication, what time measurement standard should Amateur Radio operators worldwide use? Eastern Standard Time Uniform Calibrated Time Coordinated Universal Time Universal Time Control C3BB-8.6 39NIn which International Telecommunication Union Region is Hawaii? Region 1 Region 2 Region 3 Region 4 B3BB-8.7 39NIn which International Telecommunication Union Region are the Northern Mariana Islands? Region 1 Region 2 Region 3 Region 4 C3BB-8.8 39NIn which International Telecommunication Union Region is Guam? Region 1 Region 2 Region 3 Region 4 C3BB-8.9 39NIn which International Telecommunication Union Region is Wake Island? Region 1 Region 2 Region 3 Region 4 C3BB-10.1 39NWhat is the AMATEUR AUXILIARY to the FCC's Field Operations Bureau? Amateur Volunteers formally enlisted to monitor the airwaves for rules violations Amateur Volunteers who conduct Amateur Radio licensing examinations Amateur Volunteers who conduct frequency coordination for amateur VHF repeaters Amateur Volunteers who determine height above average terrain measurements for repeater installations A3BB-10.2 39NWhat are the objectives of the AMATEUR AUXILIARY to the FCC's Field Operations Bureau? To enforce amateur self-regulation and compliance with the rules To foster amateur self-regulation and compliance with the rules To promote efficient and orderly spectrum usage in the repeater subbands To provide emergency and public safety communications B3BC-1.6 40NWhat is the maximum distance along the earth's surface that can normally be covered in one hop using the F2 layer? Approximately 180 miles Approximately 1200 miles Approximately 2500 miles No distance. This layer does not support radio communication C3BC-1.7 40NWhat is the maximum distance along the earth's surface that can be covered in one hop using the E layer? Approximately 180 miles Approximately 1200 miles Approximately 2500 miles No distance. This layer does not support radio communication B3BC-1.9 40NWhat is the average height of maximum ionization of the E layer? 45 miles 70 miles 200 miles 1200 miles B3BC-1.10 40NDuring what part of the day, and in what season of the year can the F2 layer be expected to reach its maximum height? At noon during the summer At midnight during the summer At dusk in the spring and fall At noon during the winter A3BC-1.13 41NWhat is the CRITICAL ANGLE, as used in radio wave propagation? The lowest take off angle that will return a radio wave to earth under specific ionospheric conditions The compass direction of the desired DX station from your location The 180-degree-inverted compass direction of the desired DX station from your location The highest take off angle that will return a radio wave to earth during specific ionospheric conditions D3BC-2.3 41NWhat is the main reason that the 160-, 80- and 40-meter wavelength amateur bands tend to be useful for only short-distance communications during daylight hours? Because of a lack of activity Because of auroral propagation Because of D-layer absorption Because of magnetic flux C3BC-2.4 42NWhat is the principal reason that the 160-meter through 40-meter wavelength bands are useful only for short-distance radio communications during daylight hours? F-layer bending Gamma radiation D-layer absorption Tropospheric ducting C3BC-3.3 42NIf the maximum usable frequency on the path from Minnesota to Africa is 22 MHz, which band should offer the best chance for a successful QSO? 10 meters 15 meters 20 meters 40 meters B3BC-3.4 42NIf the maximum usable frequency on the path from Ohio to West Germany is 17 MHz, which band should offer the best chance for a successful QSO? 80 meters 40 meters 20 meters 2 meters C3BC-5.1 42NOver what periods of time do sudden ionospheric disturbances normally last? The entire day A few minutes to a few hours A few hours to a few days Approximately one week B3BC-5.2 42NWhat can be done at an amateur station to continue radio communications during a sudden ionospheric disturbance? Try a higher frequency Try the other sideband Try a different antenna polarization Try a different frequency shift A3BC-5.3 43NWhat effect does a sudden ionospheric disturbance have on the daylight ionospheric propagation of HF radio waves? Disrupts higher-latitude paths more than lower-latitude paths Disrupts transmissions on lower frequencies more than those on higher frequencies Disrupts communications via satellite more than direct communications None. Only dark (as in nighttime) areas of the globe are affected B3BC-5.4 43NHow long does it take a solar disturbance that increases the sun's ultraviolet radiation to cause ionospheric disturbances on earth? Instantaneously 1.5 seconds 8 minutes 20 to 40 hours C3BC-5.5 43NSudden ionospheric disturbances cause increased radio wave absorption in which layer of the ionosphere? D layer E layer F1 layer F2 layer A3BC-6.2 43NWhat is a characteristic of BACKSCATTER signals? High intelligibility A wavering sound Reversed modulation Reversed sidebands B3BC-6.4 44NWhat makes backscatter signals often sound distorted? Auroral activity and changes in the earth's magnetic field The propagation through ground waves that absorb much of the signal's clarity The earth's E-layer at the point of radio wave refraction The small part of the signal's energy scattered back to the transmitter skip zone through several radio-wave paths D3BC-6.5 44NWhat is the radio wave propagation phenomenon that allows a signal to be detected at a distance too far for ground wave propagation but too near for normal sky wave propagation? Ground wave Scatter Sporadic-E skip Short path skip B3BC-6.6 44NWhen does ionospheric scatter propagation on the HF bands most often occur? When the sunspot cycle is at a minimum At night When the F1 and F2 layers are combined At frequencies above the maximum usable frequency D3BC-7.1 45NWhat is SOLAR FLUX? The density of the sun's magnetic field The radio energy emitted by the sun The number of sunspots on the side of the sun facing the earth A measure of the tilt of the earth's ionosphere on the side toward the sun B3BC-7.2 45NWhat is the SOLAR-FLUX INDEX? A measure of past measurements of solar activity A measurement of solar activity that compares daily readings with results from the last six months Another name for the American sunspot number A measure of solar activity that is taken daily D3BC-7.3 45NWhat is a timely indicator of solar activity? The 2800-MHz solar flux index The mean Canadian sunspot number A clock set to Coordinated Universal Time Van Allen radiation measurements taken at Boulder, Colorado A3BC-7.4 45NWhat type of propagation conditions on the 15-meter wavelength band are indicated by a solar-flux index value of 60 to 70? Unpredictable ionospheric propagation No ionospheric propagation is possible Excellent ionospheric propagation Poor ionospheric propagation D3BC-7.5 45NA solar-flux index in the range of 90 to 110 indicates what type of propagation conditions on the 15-meter wavelength band? Poor ionospheric propagation No ionospheric propagation is possible Unpredictable ionospheric propagation Good ionospheric propagation D3BC-7.6 46NA solar-flux index of greater than 120 would indicate what type of propagation conditions of the 10-meter wavelength band? Good ionospheric propagation Poor ionospheric propagation No ionospheric propagation is possible Unpredictable ionospheric propagation A3BC-7.7 46NFor widespread long distance openings on the 6-meter wavelength band, what solar-flux index values would be required? Less than 50 Approximately 75 Greater than 100 Greater than 250 D3BC-7.8 46NIf the MUF is high and HF radio communications are generally good for several days, a similar condition can usually be expected how many days later? 7 days 14 days 28 days 90 days C3BC-10.1 46NWhat is a GEOMAGNETIC DISTURBANCE? A sudden drop in the solar-flux index A shifting of the earth's magnetic pole Ripples in the ionosphere A dramatic change in the earth's magnetic field over a short period of time D3BC-10.2 46NWhich latitude paths are more susceptible to geomagnetic disturbances? Those greater than 45 degrees latitude Those less than 45 degrees latitude Equatorial paths All paths are affected equally A3BC-10.3 47NWhat can be the effect of a major geomagnetic storm on radio communications? Improved high-latitude HF communications Degraded high-latitude HF communications Improved ground-wave propagation Improved chances of ducting at UHF B3BC-10.4 47NHow long does it take a solar disturbance that increases the sun's radiation of charged particles to affect radio wave propagation on earth? The effect is instantaneous 1.5 seconds 8 minutes 20 to 40 hours D3BD-1.5 47NWhich wires in a four conductor line cord should be attached to fuses in a 234 VAC primary (single phase) power supply? Only the "hot" (black and red) wires Only the "neutral" (white) wire Only the "ground" (bare) wire All wires A3BD-1.6 47NWhat size wire is normally used on a 15-ampere, 117-VAC household lighting circuit? AWG number 14 AWG number 16 AWG number 18 AWG number 22 A3BD-1.7 48NWhat size wire is normally used on a 20-ampere, 117-VAC household appliance circuit? AWG number 20 AWG number 16 AWG number 14 AWG number 12 D3BD-1.8 48NWhat could be a cause of the room lights dimming when the transmitter is keyed? RF in the AC pole transformer High resistance in the key contacts A drop in AC line voltage The line cord is wired incorrectly C3BD-1.9 48NWhat size fuse should be used on a #12 wire household appliance circuit? Maximum of 100 amperes Maximum of 60 amperes Maximum of 30 amperes Maximum of 20 amperes D3BD-2.4 48NWhat safety feature is provided by a bleeder resistor in a power supply? It improves voltage regulation It discharges the filter capacitors It removes shock hazards from the induction coils It eliminates ground-loop current B3BD-3.1 49NWhat kind of input signal is used to test the amplitude linearity of a single sideband phone transmitter while viewing the output on an oscilloscope? Normal speech An audio-frequency sine wave Two audio-frequency sine waves An audio-frequency square wave C3BD-3.2 49NTo test the amplitude linearity of a single-sideband phone transmitter with an oscilloscope, what should the audio input to the transmitter be? Normal speech An audio-frequency sine wave Two audio-frequency sine waves An audio-frequency square wave C3BD-3.3 49NHow are two tones used to test the amplitude linearity of a single-sideband phone transmitter? Two harmonically related audio tones are fed into the microphone input of the transmitter, and the output is observed on an oscilloscope Two harmonically related audio tones are fed into the microphone input of the transmitter, and the output is observed on a distortion analyzer Two non-harmonically related audio tones are fed into the microphone input of the transmitter, and the output is observed on an oscilloscope Two non-harmonically related audio tones are fed into the microphone input of the transmitter, and the output is observed on a wattmeter C3BD-3.4 50NWhat audio frequencies are used in a TWO-TONE TEST of the linearity of a single-sideband phone transmitter? 20 Hz and 20,000 Hz tones must be used 1200 Hz and 2400 Hz tones must be used Any two audio tones may be used, but they must be within the transmitter audio passband, and must be harmonically related Any two audio tones may be used, but they must be within the transmitter audio passband, and should not be harmonically related D3BD-3.5 50NWhat can be determined by making a TWO-TONE TEST using an oscilloscope? The percent of frequency modulation The percent of carrier phase shift The frequency deviation The amplifier linearity D3BD-4.1 50NHow can the grid-current meter in a power amplifier be used as a neutralizing indicator? Tune for minimum change in grid current as the output circuit is changed Tune for maximum change in grid current as the output circuit is changed Tune for minimum grid current Tune for maximum grid current A3BD-4.2 51NWhy is neutralization in some vacuum tube amplifiers necessary? To reduce the limits of loaded Q in practical tuned circuits To reduce grid to cathode leakage To cancel acid build-up caused by thorium oxide gas To cancel oscillation caused by the effects of interelectrode capacitance D3BD-4.3 51NHow is neutralization of an RF amplifier accomplished? By supplying energy from the amplifier output to the input on alternate half cycles By supplying energy from the amplifier output to the input shifted 360 degrees out of phase By supplying energy from the amplifier output to the input shifted 180 degrees out of phase By supplying energy from the amplifier output to the input with a proper DC bias C3BD-4.4 51NWhat purpose does a neutralizing circuit serve in an RF amplifier? It controls differential gain It cancels the effects of positive feedback It eliminates circulating currents It reduces incidental grid modulation B3BD-4.5 51NWhat is the reason for neutralizing the final amplifier stage of a transmitter? To limit the modulation index To eliminate parasitic oscillations To cut off the final amplifier during standby periods To keep the carrier on frequency B3BD-5.1 52NHow can the output PEP of a transmitter be determined with an oscilloscope? Measure peak load voltage across a resistive load with an oscilloscope, and calculate, using PEP = [(Vp)(Vp)]/(RL) Measure peak load voltage across a resistive load with an oscilloscope, and calculate, using PEP = [(0.707 PEV)(0.707 PEV)]/RL Measure peak load voltage across a resistive load with an oscilloscope, and calculate, using PEP = (Vp)(Vp)(RL) Measure peak load voltage across a resistive load with an oscilloscope, and calculate, using PEP = [(1.414 PEV)(1.414 PEV)]/RL B3BD-5.5 52NWhat is the output PEP from a transmitter when an oscilloscope shows 200-volts peak-to-peak across a 50 ohm resistor connected to the transmitter output terminals? 100 watts 200 watts 400 watts 1000 watts A3BD-5.6 52NWhat is the output PEP from a transmitter when an oscilloscope shows 500-volts peak-to-peak across a 50 ohm resistor connected to the transmitter output terminals? 500 watts 625 watts 1250 watts 2500 watts B3BD-5.7 53NWhat is the output PEP of an unmodulated carrier transmitter when an average reading wattmeter connected to the transmitter output terminals indicates 1060 watts? 530 watts 1060 watts 1500 watts 2120 watts B3BD-6.1 53NWhat item of test equipment contains horizontal and vertical channel amplifiers? The ohmmeter The signal generator The ammeter The oscilloscope D3BD-6.2 53NWhat types of signals can an oscilloscope measure? Any time-dependent signal within the bandwidth capability of the instrument Blinker-light signals from ocean-going vessels International nautical flag signals Signals created by aeronautical flares A3BD-6.3 54NWhat is an OSCILLOSCOPE? An instrument that displays the radiation resistance of an antenna An instrument that displays the SWR on a feed line An instrument that displays the resistance in a circuit An instrument that displays signal waveforms D3BD-6.4 54NWhat can cause phosphor damage to an oscilloscope cathode ray tube? Directly connecting deflection electrodes to the cathode ray tube Too high an intensity setting Overdriving the vertical amplifier Improperly adjusted focus B3BD-9.1 54NWhat is a SIGNAL TRACER? A direction-finding antenna An aid for following schematic diagrams A device for detecting signals in a circuit A device for drawing signal waveforms C3BD-9.2 54NHow is a signal tracer used? To detect the presence of a signal in the various stages of a receiver To locate a source of interference To trace the path of a radio signal through the ionosphere To draw a waveform on paper A3BD-9.3 54NWhat is a signal tracer normally used for? To identify the source of radio transmissions To make exact replicas of signals To give a visual indication of standing waves on open-wire feed lines To identify an inoperative stage in a radio receiver D3BD-10.1 55NWhat is the most effective way to reduce or eliminate audio frequency interference to home entertainment systems? Install bypass inductors Install bypass capacitors Install metal oxide varistors Install bypass resistors B3BD-10.2 55NWhat should be done when a properly operating amateur station is the source of interference to a nearby telephone? Make internal adjustments to the telephone equipment Contact a phone service representative about installing RFI filters Nothing can be done to cure the interference Ground and shield the local telephone distribution amplifier B3BD-10.3 55NWhat sound is heard from a public address system when audio rectification occurs in response to a nearby single-sideband phone transmission? A steady hum that persists while the transmitter's carrier is on the air On and off humming or clicking Distorted speech from the transmitter's signals Clearly audible speech from the transmitter's signals C3BD-10.4 55NHow can the possibility of audio rectification occurring be minimized? By using a solid state transmitter By using CW emission only By ensuring all station equipment is properly grounded By using AM emission only C3BD-10.5 56NWhat sound is heard from a public address system when audio rectification occurs in response to a nearby double-sideband phone transmission? Audible, possibly distorted speech from the transmitter signals On-and-off humming or clicking Muffled, distorted speech from the transmitter's signals Extremely loud, severely distorted speech from the transmitter's signals A3BD-12.2 56NWhat is the reason for using a speech processor with a single-sideband phone transmitter? A properly adjusted speech processor reduces average transmitter power requirements A properly adjusted speech processor reduces unwanted noise pickup from the microphone A properly adjusted speech processor improves voice frequency fidelity A properly adjusted speech processor improves signal intelligibility at the receiver D3BD-12.3 57NWhen a transmitter is 100% modulated, will a speech processor increase the output PEP? Yes No It will decrease the transmitter's peak power output It will decrease the transmitter's average power output B3BD-12.4 57NUnder which band conditions should a speech processor not be used? When there is high atmospheric noise on the band When the band is crowded When the frequency in use is clear When the sunspot count is relatively high C3BD-12.5 57NWhat effect can result from using a speech processor with a single-sideband phone transmitter? A properly adjusted speech processor reduces average transmitter power requirements A properly adjusted speech processor reduces unwanted noise pickup from the microphone A properly adjusted speech processor improves voice frequency fidelity A properly adjusted speech processor improves signal intelligibility at the receiver D3BD-13.1 58NAt what point in a coaxial line should an electronic T-R switch be installed? Between the transmitter and low-pass filter Between the low-pass filter and antenna At the antenna feed point Right after the low-pass filter A3BD-13.2 58NWhy is an electronic T-R switch preferable to a mechanical one? Greater receiver sensitivity Circuit simplicity Higher operating speed Cleaner output signals C3BD-13.3 58NWhat station accessory facilitates QSK operation? Oscilloscope Audio CW filter Antenna relay Electronic TR switch D3BD-14.6 58NWhat is an antenna NOISE BRIDGE? An instrument for measuring the noise figure of an antenna or other electrical circuit An instrument for measuring the impedance of an antenna or other electrical circuit An instrument for measuring solar flux An instrument for tuning out noise in a receiver B3BD-14.7 59NHow is an antenna noise bridge used? It is connected at the antenna feed point, and the noise is read directly It is connected between a transmitter and an antenna and tuned for minimum SWR It is connected between a receiver and an unknown impedance and tuned for minimum noise It is connected between an antenna and a Transmatch and adjusted for minimum SWR C3BD-15.1 59NHow does the emitted waveform from a properly adjusted single-sideband phone transmitter appear on a monitoring oscilloscope? A vertical line A waveform that mirrors the input waveform A square wave Two loops at right angles B3BD-15.2 60NWhat is the best instrument for checking the transmitted signal quality from a CW or single-sideband phone transmitter? A monitor oscilloscope A field strength meter A sidetone monitor A diode probe and an audio amplifier A3BD-15.3 60NWhat is a MONITORING OSCILLOSCOPE? A device used by the FCC to detect out-of-band signals A device used to observe the waveform of a transmitted signal A device used to display SSTV signals A device used to display signals in a receiver IF stage B3BD-15.4 60NHow is a monitoring oscilloscope connected in a station in order to check the quality of the transmitted signal? Connect the receiver IF output to the vertical-deflection plates of the oscilloscope Connect the transmitter audio input to the oscilloscope vertical input Connect a receiving antenna directly to the oscilloscope vertical input Connect the transmitter output to the vertical-deflection plates of the oscilloscope D3BD-17.2 60NWhat is the most appropriate instrument to use when determining antenna horizontal radiation patterns? A field strength meter A grid-dip meter A wave meter A vacuum-tube voltmeter A3BD-17.3 61NWhat is a FIELD-STRENGTH meter? A device for determining the standing-wave ratio on a transmission line A device for checking modulation on the output of a transmitter A device for monitoring relative RF output A device for increasing the average transmitter output C3BD-17.4 61NWhat is a simple instrument that can be useful for monitoring relative RF output during antenna and transmitter adjustments? A field-strength meter An antenna noise bridge A multimeter A Transmatch A3BD-17.5 61NWhen the power output from a transmitter is increased by four times how should the S-meter reading on a nearby receiver change? Decrease by approximately one S-unit Increase by approximately one S-unit Increase by approximately four S-units Decrease by approximately four S-units B3BD-17.6 61NBy how many times must the power output from a transmitter be increased to raise the S-meter reading on a nearby receiver from S-8 to S-9? Approximately 2 times Approximately 3 times Approximately 4 times Approximately 5 times C3BE-1.1 61NWhat is meant by the term IMPEDANCE? The electric charge stored in a capacitor The opposition to the flow of AC in a circuit containing only capacitance The opposition to the flow of AC in a circuit The force of repulsion presented to an electric field by another field with the same charge C3BE-1.2 62NWhat is the opposition to the flow of AC in a circuit containing both resistance and reactance called? Ohm Joule Impedance Watt C3BE-3.1 62NWhat is meant by the term REACTANCE? Opposition to DC caused by resistors Opposition to AC caused by inductors and capacitors A property of ideal resistors in AC circuits A large spark produced at switch contacts when an inductor is de-energized B3BE-3.2 62NWhat is the opposition to the flow of AC caused by an inductor called? Resistance Reluctance Admittance Reactance D3BE-3.3 62NWhat is the opposition to the flow of AC caused by a capacitor called? Resistance Reluctance Admittance Reactance D3BE-3.4 62NHow does a coil react to AC? As the frequency of the applied AC increases, the reactance decreases As the amplitude of the applied AC increases, the reactance also increases As the amplitude of the applied AC increases, the reactance decreases As the frequency of the applied AC increases, the reactance also increases D3BE-3.5 63NHow does a capacitor react to AC? As the frequency of the applied AC increases, the reactance decreases As the frequency of the applied AC increases, the reactance increases As the amplitude of the applied AC increases, the reactance also increases As the amplitude of the applied AC increases, the reactance decreases A3BE-6.1 63NWhen will a power source deliver maximum output? When the impedance of the load is equal to the impedance of the source When the SWR has reached a maximum value When the power supply fuse rating equals the primary winding current When air wound transformers are used instead of iron core transformers A3BE-6.2 64NWhat is meant by IMPEDANCE MATCHING? To make the load impedance much greater than the source impedance To make the load impedance much less than the source impedance To use a balun at the antenna feed point To make the load impedance equal to the source impedance D3BE-6.3 64NWhat occurs when the impedance of an electrical load is equal to the internal impedance of the power source? The source delivers minimum power to the load There will be a high SWR condition No current can flow through the circuit The source delivers maximum power to the load D3BE-6.4 64NWhy is IMPEDANCE MATCHING important in radio work? So the source can deliver maximum power to the load So the load will draw minimum power from the source To ensure that there is less resistance than reactance in the circuit To ensure that the resistance and reactance in the circuit are equal A3BE-7.2 64NWhat is the unit measurement of reactance? Mho Ohm Ampere Siemens B3BE-7.4 64NWhat is the unit measurement of impedance? Ohm Volt Ampere Watt A3BE-10.1 64NWhat is a BEL? The basic unit used to describe a change in power levels The basic unit used to describe a change in inductances The basic unit used to describe a change in capacitances The basic unit used to describe a change in resistances A3BE-10.2 65NWhat is a DECIBEL? A unit used to describe a change in power levels, equal to 0.1 bel A unit used to describe a change in power levels, equal to 0.01 bel A unit used to describe a change in power levels, equal to 10 bels A unit used to describe a change in power levels, equal to 100 bels A3BE-10.3 65NUnder ideal conditions, a barely detectable change in loudness is approximately how many dB? 12 dB 6 dB 3 dB 1 dB D3BE-10.4 65NA two-times increase in power results in a change of how many dB? Multiplying the original power by 2 gives a new power that is 1 dB higher Multiplying the original power by 2 gives a new power that is 3 dB higher Multiplying the original power by 2 gives a new power that is 6 dB higher Multiplying the original power by 2 gives a new power that is 12 dB higher B3BE-10.5 65NAn increase of 6 dB results from raising the power by how many times? Multiply the original power by 1.5 to get the new power Multiply the original power by 2 to get the new power Multiply the original power by 3 to get the new power Multiply the original power by 4 to get the new power D3BE-10.6 66NA decrease of 3 dB results from lowering the power by how many times? Divide the original power by 1.5 to get the new power Divide the original power by 2 to get the new power Divide the original power by 3 to get the new power Divide the original power by 4 to get the new power B3BE-10.7 66NA signal strength report is "10 dB over S9". If the transmitter power is reduced from 1500 watts to 150 watts, what should be the new signal strength report? S5 S7 S9 S9 plus 5 dB C3BE-10.8 66NA signal strength report is "20 dB over S9". If the transmitter power is reduced from 1500 watts to 150 watts, what should be the new signal strength report? S5 S7 S9 S9 plus 10 dB D3BE-10.9 66NA signal strength report is "20 dB over S9". If the transmitter power is reduced from 1500 watts to 15 watts, what should be the new signal strength report? S5 S7 S9 S9 plus 10 dB C3BE-12.1 66NIf a 1.0-ampere current source is connected to two parallel connected 10 ohm resistors, how much current passes through each resistor? 10 amperes 2 amperes 1 ampere 0.5 ampere D3BE-12.3 67NIn a parallel circuit with a voltage source and several branch resistors, what relationship does the total current have to the current in the branch circuits? The total current equals the average of the branch current through each resistor The total current equals the sum of the branch current through each resistor The total current decreases as more parallel resistors are added to the circuit The total current is calculated by adding the voltage drops across each resistor and multiplying the sum by the total number of all circuit resistors B3BE-13.1 67NHow many watts of electrical power are being used when a 400-VDC power source supplies an 800 ohm load? 0.5 watt 200 watts 400 watts 320,000 watts B3BE-13.2 67NHow many watts of electrical power are being consumed by a 12-VDC pilot light which draws 0.2-amperes? 60 watts 24 watts 6 watts 2.4 watts D3BE-13.3 67NHow many watts are being dissipated when 7.0-milliamperes flows through 1.25 kilohms? Approximately 61 milliwatts Approximately 39 milliwatts Approximately 11 milliwatts Approximately 9 milliwatts A3BE-14.1 68NHow is the total resistance calculated for several resistors in series? The total resistance must be divided by the number of resistors to ensure accurate measurement of resistance The total resistance is always the lowest-rated resistance The total resistance is found by adding the individual resistances together The tolerance of each resistor must be raised proportionally to the number of resistors C3BE-14.2 68NWhat is the total resistance of two equal, parallel-connected resistors? Twice the resistance of either resistance The sum of the two resistances The total resistance cannot be determined without knowing the exact resistances Half the resistance of either resistor D3BE-14.3 68NWhat is the total inductance of two equal, parallel-connected inductors? Half the inductance of either inductor, assuming no mutual coupling Twice the inductance of either inductor, assuming no mutual coupling The sum of the two inductances, assuming no mutual coupling The total inductance cannot be determined without knowing the exact inductances A3BE-14.4 68NWhat is the total capacitance of two equal, parallel-connected capacitors? Half the capacitance of either capacitor Twice the capacitance of either capacitor The value of either capacitor The total capacitance cannot be determined without knowing the exact capacitances B3BE-14.5 69NWhat is the total resistance of two equal, series-connected resistors? Half the resistance of either resistor Twice the resistance of either resistor The value of either resistor The total resistance cannot be determined without knowing the exact resistances B3BE-14.6 69NWhat is the total inductance of two equal, series-connected inductors? Half the inductance of either inductor, assuming no mutual coupling Twice the inductance of either inductor, assuming no mutual coupling The value of either inductor, assuming no mutual coupling The total inductance cannot be determined without knowing the exact inductances B3BE-14.7 69NWhat is the total capacitance of two equal, series-connected capacitors? Half the capacitance of either capacitor Twice the capacitance of either capacitor The value of either capacitor The total capacitance cannot be determined without knowing the exact capacitances A3BE-15.1 69NWhat is the voltage across a 500 turn secondary winding in a transformer when the 2250 turn primary is connected to 117-VAC? 2369 volts 526.5 volts 26 volts 5.8 volts C3BE-15.2 70NWhat is the turns ratio of a transformer to match an audio amplifier having an output impedance of 200 ohms to a speaker having an impedance of 10 ohms? 4.47 to 1 14.14 to 1 20 to 1 400 to 1 A3BE-15.3 71NWhat is the turns ratio of a transformer to match an audio amplifier having an output impedance of 600 ohms to a speaker having an impedance of 4 ohms? 12.2 to 1 24.4 to 1 150 to 1 300 to 1 A3BE-15.4 71NWhat is the impedance of a speaker which requires a transformer with a turns ratio of 24 to 1 to match an audio amplifier having an output impedance of 2000 ohms? 576 ohms 83.3 ohms 7.0 ohms 3.5 ohms D3BE-16.1 72NWhat is the voltage that would produce the same amount of heat over time in a resistive element as would an applied sine wave AC voltage? A DC voltage equal to the peak-to-peak value of the AC voltage A DC voltage equal to the RMS value of the AC voltage A DC voltage equal to the average value of the AC voltage A DC voltage equal to the peak value of the AC voltage B3BE-16.2 72NWhat is the peak-to-peak voltage of a sine wave which has an RMS voltage of 117 volts? 82.7 volts 165.5 volts 183.9 volts 330.9 volts D3BE-16.3 72NA sine wave of 17-volts peak is equivalent to how many volts RMS? 8.5 volts 12 volts 24 volts 34 volts B3BF-1.5 73NWhat is the effect of an increase in ambient temperature on the resistance of a carbon resistor? The resistance will increase by 20% for every 10 degrees centigrade that the temperature increases The resistance stays the same The resistance change depends on the resistor's temperature coefficient rating The resistance becomes time dependent C3BF-2.6 73NWhat type of capacitor is often used in power supply circuits to filter the rectified AC? Disc ceramic Vacuum variable Mica Electrolytic D3BF-2.7 73NWhat type of capacitor is used in power supply circuits to filter transient voltage spikes across the transformer secondary winding? High-value Trimmer Vacuum variable Suppressor D3BF-3.5 73NHow do inductors become self-resonant? Through distributed electromagnetism Through eddy currents Through distributed capacitance Through parasitic hysteresis C3BF-4.1 74NWhat circuit component can change 120-VAC to 400-VAC? A transformer A capacitor A diode An SCR A3BF-4.2 74NWhat is the source of energy connected to in a transformer? To the secondary winding To the primary winding To the core To the plates B3BF-4.3 74NWhen there is no load is attached to the secondary winding of a transformer, what is the current in the primary winding called? Magnetizing current Direct current Excitation current Stabilizing current A3BF-4.4 74NIn what terms are the primary and secondary windings ratings of a power transformer usually specified? Joules per second Peak inverse voltage Coulombs per second Volts or volt-amperes D3BF-5.1 75NWhat is the PEAK-INVERSE-VOLTAGE rating of a power supply rectifier? The highest transient voltage the diode will handle 1.4 times the AC frequency The maximum voltage to be applied in the non-conducting direction 2.8 times the AC frequency C3BF-5.2 75NWhy must silicon rectifier diodes be thermally protected? Because of their proximity to the power transformer Because they will be destroyed if they become too hot Because of their susceptibility to transient voltages Because of their use in high-voltage applications B3BF-5.4 75NWhat are the two major ratings for silicon diode rectifiers of the type used in power supply circuits which must not be exceeded? Peak load impedance; peak voltage Average power; average voltage Capacitive reactance; avalanche voltage Peak inverse voltage; average forward current D3BG-1.1 75NWhy should a resistor and capacitor be wired in parallel with power supply rectifier diodes? To equalize voltage drops and guard against transient voltage spikes To ensure that the current through each diode is about the same To smooth the output waveform To decrease the output voltage A3BG-1.2 76NWhat function do capacitors serve when resistors and capacitors are connected in parallel with high voltage power supply rectifier diodes? They double or triple the output voltage They block the alternating current They protect those diodes that develop back resistance faster than other diodes They regulate the output voltage C3BG-1.3 76NWhat is the output waveform of an unfiltered full-wave rectifier connected to a resistive load? A steady DC voltage A sine wave at half the frequency of the AC input A series of pulses at the same frequency as the AC input A series of pulses at twice the frequency of the AC input D3BG-1.4 76NHow many degrees of each cycle does a half-wave rectifier utilize? 90 degrees 180 degrees 270 degrees 360 degrees B3BG-1.5 76NHow many degrees of each cycle does a full-wave rectifier utilize? 90 degrees 180 degrees 270 degrees 360 degrees D3BG-1.6 77NWhere is a power supply bleeder resistor connected? Across the filter capacitor Across the power-supply input Between the transformer primary and secondary Across the inductor in the output filter A3BG-1.7 77NWhat components comprise a power supply filter network? Diodes Transformers and transistors Quartz crystals Capacitors and inductors D3BG-1.8 77NWhat should be the peak-inverse-voltage rating of the rectifier in a full-wave power supply? One-quarter the normal output voltage of the power supply Half the normal output voltage of the power supply Equal to the normal output voltage of the power supply Double the normal peak output voltage of the power supply D3BG-1.9 77NWhat should be the peak-inverse-voltage rating of the rectifier in a half-wave power supply? One-quarter to one-half the normal peak output voltage of the power supply Half the normal output voltage of the power supply Equal to the normal output voltage of the power supply One to two times the normal peak output voltage of the power supply D3BG-2.8 77NWhat should the impedance of a low-pass filter be as compared to the impedance of the transmission line into which it is inserted? Substantially higher About the same Substantially lower Twice the transmission line impedance B3BH-2.1 78NWhat is the term for alteration of the amplitude of an RF wave for the purpose of conveying information? Frequency modulation Phase modulation Amplitude rectification Amplitude modulation D3BH-2.3 78NWhat is the term for alteration of the phase of an RF wave for the purpose of conveying information? Pulse modulation Phase modulation Phase rectification Amplitude modulation B3BH-2.4 78NWhat is the term for alteration of the frequency of an RF wave for the purpose of conveying information? Phase rectification Frequency rectification Amplitude modulation Frequency modulation D3BH-3.1 78NIn what emission type does the instantaneous amplitude (envelope) of the RF signal vary in accordance with the modulating AF? Frequency shift keying Pulse modulation Frequency modulation Amplitude modulation D3BH-3.2 78NWhat determines the spectrum space occupied by each group of sidebands generated by a correctly operating double-sideband phone transmitter? The audio frequencies used to modulate the transmitter The phase angle between the audio and radio frequencies being mixed The radio frequencies used in the transmitter's VFO The CW keying speed A3BH-4.1 78NHow much is the carrier suppressed in a single-sideband phone transmission? No more than 20 dB below peak output power No more than 30 dB below peak output power At least 40 dB below peak output power At least 60 dB below peak output power C3BH-4.2 79NWhat is one advantage of carrier suppression in a double-sideband phone transmission? Only half the bandwidth is required for the same information content Greater modulation percentage is obtainable with lower distortion More power can be put into the sidebands Simpler equipment can be used to receive a double-sideband suppressed-carrier signal C3BH-5.1 79NWhich one of the telephony emissions popular with amateurs occupies the narrowest band of frequencies? Single-sideband emission Double-sideband emission Phase-modulated emission Frequency-modulated emission A3BH-5.2 79NWhich emission type is produced by a telephony transmitter having a balanced modulator followed by a 2.5-kHz bandpass filter? PM AM SSB FM C3BH-7.2 79NWhat emission is produced by a reactance modulator connected to an RF power amplifier? Multiplex modulation Phase modulation Amplitude modulation Pulse modulation B3BH-8.1 79NWhat purpose does the carrier serve in a double-sideband phone transmission? The carrier separates the sidebands so they don't cancel in the receiver The carrier contains the modulation information The carrier maintains symmetry of the sidebands to prevent distortion The carrier serves as a reference signal for demodulation by an envelope detector D3BH-8.2 80NWhat signal component appears in the center of the frequency band of a double-sideband phone transmission? The lower sidebands The subcarrier The carrier The pilot tone C3BH-9.1 80NWhat sidebands are generated by a double-sideband phone transmitter with a 7250-kHz carrier when it is modulated less than 100% by an 800-Hz pure sine wave? 7250.8 kHz and 7251.6 kHz 7250.0 kHz and 7250.8 kHz 7249.2 kHz and 7250.8 kHz 7248.4 kHz and 7249.2 kHz C3BH-10.1 80NHow many times over the maximum deviation is the bandwidth of an FM-phone transmission? 1.5 At least 2 At least 4 The bandwidth cannot be determined without knowing the exact carrier and modulating frequencies involved B3BH-10.2 81NWhat is the total bandwidth of an FM-phone transmission having a 5-kHz deviation and a 3-kHz modulating frequency? 3 kHz 5 kHz 8 kHz 16 kHz D3BH-11.1 81NWhat happens to the shape of the RF envelope, as viewed on an oscilloscope, during double-sideband phone transmission? The amplitude of the envelope increases and decreases in proportion to the modulating signal The amplitude of the envelope remains constant The brightness of the envelope increases and decreases in proportion to the modulating signal The frequency of the envelope increases and decreases in proportion to the modulating signal A3BH-13.1 81NWhat results when a single-sideband phone transmitter is overmodulated? The signal becomes louder with no other effects The signal occupies less bandwidth with poor high frequency response The signal has higher fidelity and improved signal-to-noise ratio The signal becomes distorted and occupies more bandwidth D3BH-13.2 81NWhat results when a double-sideband phone transmitter is overmodulated? The signal becomes louder with no other effects The signal becomes distorted and occupies more bandwidth The signal occupies less bandwidth with poor high frequency response The transmitter's carrier frequency deviates B3BH-15.1 81NWhat is the frequency deviation for a 12.21-MHz reactance-modulated oscillator in a 5-kHz deviation, 146.52-MHz FM-phone transmitter? 41.67 Hz 416.7 Hz 5 kHz 12 kHz B3BH-15.2 82NWhat stage in a transmitter would translate a 5.3-MHz input signal to 14.3 MHz? A mixer A beat frequency oscillator A Frequency multiplier A linear translator A3BH-16.4 82NHow many frequency components are in the signal from an AF shift keyer at any instant? One Two Three Four A3BH-16.5 82NHow is frequency shift related to keying speed in an FSK signal? The frequency shift in Hertz must be at least four times the keying speed in WPM The frequency shift must not exceed 15 Hz per WPM of keying speed Greater keying speeds require greater frequency shifts Greater keying speeds require smaller frequency shifts C3BI-1.3 82NWhy is a Yagi antenna often used for radio communications on the 20-meter wavelength band? It provides excellent omnidirectional coverage in the horizontal plane It is smaller, less expensive and easier to erect than a dipole or vertical Antenna It discriminates against interference from other stations off to the side or behind It provides the highest possible angle of radiation for the HF bands C3BI-1.7 83NWhat method is best suited to match an unbalanced coaxial feed line to a Yagi antenna? "T" match Delta match Hairpin match Gamma match D3BI-1.9 83NHow can the bandwidth of a parasitic beam antenna be increased? Use larger diameter elements Use closer element spacing Use traps on the elements Use tapered-diameter elements A3BI-2.1 83NHow much gain over a half-wave dipole can a two-element cubical quad antenna provide? Approximately 0.6 dB Approximately 2 dB Approximately 6 dB Approximately 12 dB C3BI-3.1 84NHow long is each side of a cubical quad antenna driven element for 21.4-MHz? 1.17 feet 11.7 feet 47 feet 469 feet B3BI-3.2 84NHow long is each side of a cubical quad antenna driven element for 14.3-MHz? 1.75 feet 17.6 feet 23.4 feet 70.3 feet B3BI-3.3 84NHow long is each side of a cubical quad antenna reflector element for 29.6-MHz? 8.23 feet 8.7 feet 9.7 feet 34.8 feet B3BI-3.4 84NHow long is each leg of a symmetrical delta loop antenna driven element for 28.7-MHz? 8.75 feet 11.32 feet 11.7 feet 35 feet C3BI-3.5 85NHow long is each leg of a symmetrical delta loop antenna driven element for 24.9-MHz? 10.09 feet 13.05 feet 13.45 feet 40.36 feet C3BI-3.6 85NHow long is each leg of a symmetrical delta loop antenna reflector element for 14.1-MHz? 18.26 feet 23.76 feet 24.35 feet 73.05 feet C3BI-3.7 85NHow long is the driven element of a Yagi antenna for 14.0-MHz? Approximately 17 feet Approximately 33 feet Approximately 35 feet Approximately 66 feet B3BI-3.8 86NHow long is the director element of a Yagi antenna for 21.1-MHz? Approximately 42 feet Approximately 21 feet Approximately 17 feet Approximately 10.5 feet B3BI-3.9 86NHow long is the reflector element of a Yagi antenna for 28.1-MHz? Approximately 8.75 feet Approximately 16.6 feet Approximately 17.5 feet Approximately 35 feet C3BI-5.1 86NWhat is the feed-point impedance for a half-wavelength dipole HF antenna suspended horizontally one-quarter wavelength or more above the ground? Approximately 50 ohms, resistive Approximately 73 ohms, resistive and inductive Approximately 50 ohms, resistive and capacitive Approximately 73 ohms, resistive D3BI-5.2 86NWhat is the feed-point impedance of a quarter-wavelength vertical HF antenna with a horizontal ground plane? Approximately 18 ohms Approximately 36 ohms Approximately 52 ohms Approximately 72 ohms B3BI-5.3 87NWhat is the advantage of downward sloping radials on a ground plane antenna? Sloping the radials downward lowers the radiation angle Sloping the radials downward brings the feed-point impedance closer to 300 ohms Sloping the radials downward allows rainwater to run off the antenna Sloping the radials downward brings the feed-point impedance closer to 50 ohms D3BI-5.4 87NWhat happens to the feed-point impedance of a ground-plane antenna when the radials slope downward from the base of the antenna? The feed-point impedance decreases The feed-point impedance increases The feed-point impedance stays the same The feed-point impedance becomes purely capacitive B3BI-6.1 87NCompared to a dipole antenna, what are the directional radiation characteristics of a cubical quad HF antenna? The quad has more directivity in the horizontal plane but less directivity in the vertical plane The quad has less directivity in the horizontal plane but more directivity in the vertical plane The quad has more directivity in both horizontal and vertical planes The quad has less directivity in both horizontal and vertical planes C3BI-6.2 87NWhat is the radiation pattern of an ideal half-wavelength dipole HF antenna? If it is installed parallel to the earth, it radiates well in a figure eight pattern at right angles to the antenna wire If it is installed parallel to the earth, it radiates well in a figure eight pattern off both ends of the antenna wire If it is installed parallel to the earth, it radiates equally well in all directions If it is installed parallel to the earth, the pattern will have two lobes on one side of the antenna wire and one larger lobe on the other side A3BI-6.3 88NHow does proximity to the ground affect the radiation pattern of a horizontal dipole HF antenna? If the antenna is too far from the ground, the pattern becomes unpredictable If the antenna is less than one-half wavelength from the ground, reflected radio waves from the ground distort the radiation pattern of the antennaA dipole antenna's radiation pattern is unaffected by its distance to the ground If the antenna is less than one half wavelength from the ground, radiation off the ends of the wire is reduced B3BI-6.4 88NWhat does the term ANTENNA FRONT-TO-BACK RATIO mean? The number of directors versus the number of reflectors The relative position of the driven element with respect to the reflectors and directors The power radiated in the major radiation lobe compared to the power radiated in exactly the opposite direction The power radiated in the major radiation lobe compared to the power radiated 90 degrees away from that direction C3BI-6.5 88NWhat effect upon the radiation pattern of an HF dipole antenna will a slightly smaller parasitic parallel element located a few feet away in the same horizontal plane have? The radiation pattern will not change appreciably A major lobe will develop in the horizontal plane, parallel to the two elements A major lobe will develop in the vertical plane, away from the ground If the spacing is greater than 0.1 wavelength, a major lobe will develop in the horizontal plane to the side of the driven element toward the parasitic elementD3BI-6.6 88NWhat is the meaning of the term MAIN LOBE as used in reference to a directional antenna? The direction of least radiation from an antenna The point of maximum current in a radiating antenna element The direction of maximum radiated field strength from a radiating antenna The maximum voltage standing wave point on a radiating element C3BI-7.1 89NUpon what does the characteristic impedance of a parallel-conductor antenna feed line depend? The distance between the centers of the conductors and the radius of the conductors The distance between the centers of the conductors and the length of the line The radius of the conductors and the frequency of the signal The frequency of the signal and the length of the line A3BI-7.2 89NWhat is the characteristic impedance of various coaxial cables commonly used for antenna feed lines at amateur stations? Around 25 and 30 ohms Around 50 and 75 ohms Around 80 and 100 ohms Around 500 and 750 ohms B3BI-7.3 89NWhat effect, if any, does the length of a coaxial cable have upon its characteristic impedance? The length has no effect on the characteristic impedance The length affects the characteristic impedance primarily above 144 MHz The length affects the characteristic impedance primarily below 144 MHz The length affects the characteristic impedance at any frequency A3BI-7.4 89NWhat is the characteristic impedance of flat-ribbon TV-type twinlead? 50 ohms 75 ohms 100 ohms 300 ohms D3BI-8.4 90NWhat is the cause of power being reflected back down an antenna feed line? Operating an antenna at its resonant frequency Using more transmitter power than the antenna can handle A difference between feed line impedance and antenna feed point impedance Feeding the antenna with unbalanced feed line C3BI-9.3 91NWhat will be the standing wave ratio when a 50 ohm feed line is connected to a resonant antenna having a 200 ohm feed-point impedance? 4:1 1:4 2:1 1:2 A3BI-9.4 91NWhat will be the standing wave ratio when a 50 ohm feed line is connected to a resonant antenna having a 10 ohm feed-point impedance? 2:1 50:1 1:5 5:1 D3BI-9.5 91NWhat will be the standing wave ratio when a 50 ohm feed line is connected to a resonant antenna having a 50 ohm feed-point impedance? 2:1 50:50 1:1 0:0 C3BI-11.1 91NHow does the characteristic impedance of a coaxial cable affect the amount of attenuation to the RF signal passing through it? The attenuation is affected more by the characteristic impedance at frequencies above 144 MHz than at frequencies below 144 MHz The attenuation is affected less by the characteristic impedance at frequencies above 144 MHz than at frequencies below 144 MHz The attenuation related to the characteristic impedance is about the same at all amateur frequencies below 1.5 GHz The difference in attenuation depends on the emission type in use C3BI-11.2 91NHow does the amount of attenuation to a 2 meter signal passing through a coaxial cable differ from that to a 160 meter signal? The attenuation is greater at 2 meters The attenuation is less at 2 meters The attenuation is the same at both frequencies The difference in attenuation depends on the emission type in use A3BI-11.4 92NWhat is the effect on its attentuation when flat-ribbon TV-type twinlead is wet? Attenuation decreases slightly Attenuation remains the same Attenuation decreases sharply Attenuation increases D3BI-11.7 92NWhy might silicone grease or automotive car wax be applied to flat-ribbon TV-type twinlead? To reduce "skin effect" losses on the conductors To reduce the buildup of dirt and moisture on the feed line To increase the velocity factor of the feed line To help dissipate heat during high-SWR operation B3BI-11.8 92NIn what values are RF feed line losses usually expressed? Bels/1000 ft dB/1000 ft Bels/100 ft dB/100 ft D3BI-11.10 92NAs the operating frequency increases, what happens to the dielectric losses in a feed line? The losses decrease The losses decrease to zero The losses remain the same The losses increase D3BI-11.12 92NAs the operating frequency decreases, what happens to the dielectric losses in a feed line? The losses decrease The losses increase The losses remain the same The losses become infinite A3BI-12.1 93NWhat condition must be satisfied to prevent standing waves of voltage and current on an antenna feed line? The antenna feed point must be at DC ground potential The feed line must be an odd number of electrical quarter wavelengths long The feed line must be an even number of physical half wavelengths long The antenna feed point impedance must be matched to the characteristic impedance of the feed line D3BI-12.2 93NHow is an inductively-coupled matching network used in an antenna system consisting of a center-fed resonant dipole and coaxial feed line? An inductively coupled matching network is not normally used in a resonant antenna system An inductively coupled matching network is used to increase the SWR to an acceptable level An inductively coupled matching network can be used to match the unbalanced condition at the transmitter output to the balanced condition required by the coaxial lineAn inductively coupled matching network can used at the antenna feed point to tune out the radiation resistance A3BI-12.5 93NWhat is an antenna-transmission line MISMATCH? A condition where the feed-point impedance of the antenna does not equal the output impedance of the transmitter A condition where the output impedance of the transmitter does not equal the characteristic impedance of the feed line A condition where a half-wavelength antenna is being fed with a transmission line of some length other than one-quarter wavelength at the operating frequency A condition where the characteristic impedance of the feed line does not equal the feed-point impedance of the antenna Dnna is being fed with a transmission line of some length other than one-quarter wavelength at the operating frequency A condition where the characteristic impedance of the feed line does not equal the feed-point impedance of the antenna D
