G1A01XXXNWhat are the frequency limits for General class operators in the 160-meter band? 1800 - 1900 kHz 1900 - 2000 kHz 1800 - 2000 kHz 1825 - 2000 kHz CG1A02XXXNWhat are the frequency limits for General class operators in the 75/80-meter band (ITU Region 2)? 3525 - 3750 kHz and 3850 - 4000 kHz 3525 - 3775 kHz and 3875 - 4000 kHz 3525 - 3750 kHz and 3875 - 4000 kHz 3525 - 3775 kHz and 3850 - 4000 kHz AG1A03XXXNWhat are the frequency limits for General class operators in the 40-meter band (ITU Region 2)? 7025 - 7175 kHz and 7200 - 7300 kHz 7025 - 7175 kHz and 7225 - 7300 kHz 7025 - 7150 kHz and 7200 - 7300 kHz 7025 - 7150 kHz and 7225 - 7300 kHz DG1A04XXXNWhat are the frequency limits for General class operators in the 30-meter band? 10100 - 10150 kHz 10100 - 10175 kHz 10125 - 10150 kHz 10125 - 10175 kHz AG1A05XXXNWhat are the frequency limits for General class operators in the 20-meter band? 14025 - 14100 kHz and 14175 - 14350 kHz 14025 - 14150 kHz and 14225 - 14350 kHz 14025 - 14125 kHz and 14200 - 14350 kHz 14025 - 14175 kHz and 14250 - 14350 kHz BG1A06XXXNWhat are the frequency limits for General class operators in the 15-meter band? 21025 - 21200 kHz and 21275 - 21450 kHz 21025 - 21150 kHz and 21300 - 21450 kHz 21025 - 21150 kHz and 21275 - 21450 kHz 21025 - 21200 kHz and 21300 - 21450 kHz DG1A07XXXNWhat are the frequency limits for General class operators in the 12-meter band? 24890 - 24990 kHz 24890 - 24975 kHz 24900 - 24990 kHz 24900 - 24975 kHz AG1A08XXXNWhat are the frequency limits for General class operators in the 10-meter band? 28000 - 29700 kHz 28025 - 29700 kHz 28100 - 29600 kHz 28125 - 29600 kHz AG1A09XXXNWhat are the frequency limits within the 160-meter band for phone emissions? 1800 - 2000 kHz 1800 - 1900 kHz 1825 - 2000 kHz 1825 - 1900 kHz AG1A10XXXNWhat are the frequency limits within the 80-meter band in ITU Region 2 for CW emissions? 3500 - 3750 kHz 3700 - 3750 kHz 3500 - 4000 kHz 3890 - 4000 kHz CG1A11XXXNWhat are the frequency limits within the 40-meter band in ITU Region 2 for image emissions? 7225 - 7300 kHz 7000 - 7150 kHz 7100 - 7150 kHz 7150 - 7300 kHz DG1A12XXXNWhat are the frequency limits within the 30-meter band for RTTY emissions? 10125 - 10150 kHz 10125 - 10140 kHz 10100 - 10150 kHz 10100 - 10140 kHz CG1A13XXXNWhat are the frequency limits within the 20-meter band for image emissions? 14025 - 14300 kHz 14150 - 14350 kHz 14025 - 14350 kHz 14150 - 14300 kHz BG1A14XXXNWhat are the frequency limits within the 15-meter band for image emissions? 21250 - 21300 kHz 21150 - 21450 kHz 21200 - 21450 kHz 21100 - 21300 kHz CG1A15XXXNWhat are the frequency limits within the 12-meter band for phone emissions? 24890 - 24990 kHz 24890 - 24930 kHz 24930 - 24990 kHz Phone emissions are not permitted in this band CG1A16XXXNWhat are the frequency limits within the 10-meter band for phone emissions? 28000 - 28300 kHz 29000 - 29700 kHz 28300 - 29700 kHz 28000 - 29000 kHz CG1A17XXXNAs a General class control operator at a Novice station, how must you identify your station when transmitting on 7250 kHz? With your call sign, followed by the word "controlling" and the Novice call sign With the Novice call sign, followed by the slant bar "/" (or any suitable word) and your own call sign With your call sign, followed by the slant bar "/" (or any suitable word) and the Novice call sign A Novice station should not be operated on 7250 kHz, even with a General control operator BG1A18XXXNUnder what circumstances may a 10-meter repeater retransmit the 2-meter signal from a Technician class operator? Under no circumstances Only if the station on 10 meters is operating under a Special Temporary Authorization allowing such retransmission Only during an FCC-declared general state of communications emergency Only if the 10-meter control operator holds at least a General class license DG1A19XXXNWhat kind of amateur station automatically retransmits the signals of other stations? Repeater station Space station Telecommand station Relay station AG1A20XXXNWhat name is given to a form of interference that seriously degrades, obstructs or repeatedly interrupts a radiocommunication service? Intentional interference Harmful interference Adjacent interference Disruptive interference BG1A21XXXNWhat types of messages may be transmitted by an amateur station to a foreign country for a third party? Messages for which the amateur operator is paid Messages facilitating the business affairs of any party Messages of a technical nature or remarks of a personal character No messages may be transmitted to foreign countries for third parties CG1B01XXXNUp to what height above the ground may you install an antenna structure without needing FCC approval? 50 feet 100 feet 200 feet 300 feet CG1B02XXXNIf the FCC Rules DO NOT specifically cover a situation, how must you operate your amateur station? In accordance with general licensee operator principles In accordance with good engineering and good amateur practice In accordance with practices adopted by the Institute of Electrical and Electronics Engineers In accordance with procedures set forth by the International Amateur Radio Union BG1B03XXXNWhich type of station may transmit one-way communications? Repeater station Beacon station HF station VHF station BG1B04XXXNWhich of the following does NOT need to be true if an amateur station gathers news information for broadcast purposes? The information is more quickly transmitted by amateur radio The information must involve the immediate safety of life of individuals or the immediate protection of property The information must be directly related to the event The information cannot be transmitted by other means AG1B05XXXNUnder what limited circumstances may music be transmitted by an amateur station? When it produces no dissonances or spurious emissions When it is used to jam an illegal transmission When it is transmitted on frequencies above 1215 MHz When it is an incidental part of a space shuttle retransmission DG1B06XXXNWhen may an amateur station in two-way communication transmit a message in a secret code in order to obscure the meaning of the communication? When transmitting above 450 MHz During contests Never During a declared communications emergency CG1B07XXXNWhat are the restrictions on the use of abbreviations or procedural signals in the amateur service? There are no restrictions They may be used if they do not obscure the meaning of a message They are not permitted because they obscure the meaning of a message to FCC monitoring stations Only "10-codes" are permitted BG1B08XXXNWhen are codes or ciphers permitted in two-way domestic amateur communications? Never During contests During nationally declared emergencies On frequencies above 2.3 GHz AG1B09XXXNWhen are codes or ciphers permitted in two-way international amateur communications? Never During contests During internationally declared emergencies On frequencies above 2.3 GHz AG1B10XXXNWhich of the following amateur transmissions is NOT prohibited by the FCC Rules? The playing of music The use of obscene or indecent words False or deceptive messages or signals Retransmission of space shuttle communications DG1B11XXXNWhat should you do to keep your station from retransmitting music or signals from a non-amateur station? Turn up the volume of your transceiver Speak closer to the microphone to increase your signal strength Turn down the volume of background audio Adjust your transceiver noise blanker CG1C01XXXNWhat is the maximum transmitting power an amateur station may use on 3690 kHz? 200 watts PEP output 1000 watts PEP output 1500 watts PEP output 2000 watts PEP output AG1C02XXXNWhat is the maximum transmitting power an amateur station may use on 7080 kHz? 200 watts PEP output 1000 watts PEP output 1500 watts PEP output 2000 watts PEP output CG1C03XXXNWhat is the maximum transmitting power an amateur station may use on 10.140 MHz? 200 watts PEP output 1000 watts PEP output 1500 watts PEP output 2000 watts PEP output AG1C04XXXNWhat is the maximum transmitting power an amateur station may use on 21.150 MHz? 200 watts PEP output 1000 watts PEP output 1500 watts PEP output 2000 watts PEP output AG1C05XXXNWhat is the maximum transmitting power an amateur station may use on 24.950 MHz? 200 watts PEP output 1000 watts PEP output 1500 watts PEP output 2000 watts PEP output CG1C06XXXNExternal RF power amplifiers designed to operate below what frequency may require FCC type acceptance? 28 MHz 35 MHz 50 MHz 144 MHz DG1C07XXXNWithout a grant of FCC type acceptance, how many external RF amplifiers of a given design capable of operation below 144 MHz may you build or modify in one calendar year? None 1 5 10 BG1C08XXXNWhich of the following standards must be met if FCC type acceptance of an external RF amplifier is required? The amplifier must not be able to amplify a 28-MHz signal to more than ten times the input power The amplifier must not be capable of reaching its designed output power when driven with less than 50 watts The amplifier must not be able to be operated for more than ten minutes without a time delay circuit The amplifier must not be able to be modified by an amateur operator BG1C09XXXNWhich of the following would NOT disqualify an external RF power amplifier from being granted FCC type acceptance? The capability of being modified by the operator for use outside the amateur bands The capability of achieving full output power when driven with less than 50 watts The capability of achieving full output power on amateur frequencies between 24 and 35 MHz The capability of being switched by the operator to all amateur frequencies below 24 MHz DG1C10XXXNWhat is the maximum symbol rate permitted for packet emissions below 28 MHz? 300 bauds 1200 bauds 19.6 kilobauds 56 kilobauds AG1C11XXXNWhat is the maximum symbol rate permitted for RTTY emissions below 28 MHz? 56 kilobauds 19.6 kilobauds 1200 bauds 300 bauds DG1D01XXXNWhat telegraphy examination elements may you prepare if you hold a General class license? None Element 1A only Element 1B only Elements 1A and 1B BG1D02XXXNWhat written examination elements may you prepare if you hold a General class license? None Element 2 only Elements 2 and 3A Elements 2, 3A and 3B CG1D03XXXNWhat license examinations may you administer if you hold a General class license? None Novice only Novice and Technician Novice, Technician and General CG1D04XXXNWhat minimum examination elements must an applicant pass for a Novice license? Element 2 only Elements 1A and 2 Elements 2 and 3A Elements 1A, 2 and 3A BG1D05XXXNWhat minimum examination elements must an applicant pass for a Technician license? Element 2 only Elements 1A and 2 Elements 2 and 3A Elements 1A, 2 and 3A CG1D06XXXNWhat minimum examination elements must an applicant pass for a Technician license with HF privileges? Element 2 only Elements 1A and 2 Elements 2 and 3A Elements 1A, 2 and 3A DG1D07XXXNWhat are the requirements for administering Novice examinations? Three VEC-accredited General class or higher VEs must be present Two VEC-accredited General class or higher VEs must be present Two General class or higher VEs must be present, but only one need be VEC accredited Any two General class or higher VEs must be present AG1D08XXXNWhen may you participate as an administering Volunteer Examiner (VE) for a Novice license examination? Once you have notified the FCC that you want to give an examination Once you have a Certificate of Successful Completion of Examination (CSCE) for General class Once you have prepared telegraphy and written examinations for the Novice license, or obtained them from a qualified supplierOnce you have received both your FCC-issued General class or higher license in the mail and VEC accreditation DG1D09XXXNIf you are a Technician licensee with a Certificate of Successful Completion of Examination (CSCE) for General privileges, how do you identify your station when transmitting on 14.035 MHz? You must give your call sign and the location of the VE examination where you obtained the CSCE You must give your call sign, followed by the slant mark "/", followed by the identifier "AG" You may not operate on 14.035 MHz until your new license arrives No special form of identification is needed BG1D10XXXNIf you are a Technician licensee with a Certificate of Successful Completion of Examination (CSCE) for General privileges, how do you identify your station when transmitting phone emissions on 14.325 MHz?No special form of identification is needed You may not operate on 14.325 MHz until your new license arrives You must give your call sign, followed by any suitable word that denotes the slant mark and the identifier "AG" You must give your call sign and the location of the VE examination where you obtained the CSCE CG1D11XXXNIf you are a Technician licensee with a Certificate of Successful Completion of Examination (CSCE) for General privileges, when must you add the special identifier "AG" after your call sign? Whenever you operate using your new frequency privileges Whenever you operate Whenever you operate using Technician frequency privileges A special identifier is not required as long as your General class license application has been filed with the FCC AG2A01XXXNWhich sideband is commonly used for 20-meter phone operation? Upper Lower Amplitude compandored Double AG2A02XXXNWhich sideband is commonly used on 3925-kHz for phone operation? Upper Lower Amplitude compandored Double BG2A03XXXNIn what segment of the 80-meter band do most RTTY transmissions take place? 3610 - 3630 kHz 3500 - 3525 kHz 3700 - 3750 kHz 3775 - 3825 kHz AG2A04XXXNIn what segment of the 20-meter band do most RTTY transmissions take place? 14.000 - 14.050 MHz 14.075 - 14.100 MHz 14.150 - 14.225 MHz 14.275 - 14.350 MHz BG2A05XXXNWhat is the Baudot code? A 7-bit code, with start, stop and parity bits A 7-bit code in which each character has four mark and three space bits A 5-bit code, with additional start and stop bits A 6-bit code, with additional start, stop and parity bits CG2A06XXXNWhat is ASCII? A 7-bit code, with additional start, stop and parity bits A 7-bit code in which each character has four mark and three space bits A 5-bit code, with additional start and stop bits A 5-bit code in which each character has three mark and two space bits AG2A07XXXNWhat is the most common frequency shift for RTTY emissions in the amateur HF bands? 85 Hz 170 Hz 425 Hz 850 Hz BG2A08XXXNWhat are the two major AMTOR operating modes? Mode AM and Mode TR Mode A (ARQ) and Mode B (FEC) Mode C (CRQ) and Mode D (DEC) Mode SELCAL and Mode LISTEN BG2A09XXXNWhat is the usual input/output frequency separation for a 10-meter station in repeater operation? 100 kHz 600 kHz 1.6 MHz 170 Hz AG2A10XXXNWhat is the circuit called which causes a transmitter to automatically transmit when an operator speaks into its microphone? VXO VOX VCO VFO BG2A11XXXNWhich of the following describes full break-in telegraphy? Breaking stations send the Morse code prosign BK Automatic keyers are used to send Morse code instead of hand keys An operator must activate a manual send/receive switch before and after every transmission Incoming signals are received between transmitted key pulses DG2B01XXXNIf you are the net control station of a daily HF net, what should you do if the frequency on which you normally meet is in use just before the net begins? Reduce your output power and start the net as usual Increase your power output so that net participants will be able to hear you over the existing activity Cancel the net for that day Conduct the net on a frequency 3 to 5 kHz away from the regular net frequency DG2B02XXXNIf a net is about to begin on a frequency which you and another station are using, what should you do? As a courtesy to the net, move to a different frequency Increase your power output to ensure that all net participants can hear you Transmit as long as possible on the frequency so that no other stations may use it Turn off your radio AG2B03XXXNIf propagation changes during your contact and you notice increasing interference from other activity on the same frequency, what should you do? Tell the interfering stations to change frequency, since you were there first Report the interference to your local Amateur Auxiliary Coordinator Turn on your amplifier to overcome the interference Move your contact to another frequency DG2B04XXXNWhen selecting a CW transmitting frequency, what minimum frequency separation from a contact in progress should you allow to minimize interference? 5 to 50 Hz 150 to 500 Hz 1 to 3 kHz 3 to 6 kHz BG2B05XXXNWhen selecting a single-sideband phone transmitting frequency, what minimum frequency separation from a contact in progress should you allow (between suppressed carriers) to minimize interference? 150 to 500 Hz Approximately 3 kHz Approximately 6 kHz Approximately 10 kHz BG2B06XXXNWhen selecting a RTTY transmitting frequency, what minimum frequency separation from a contact in progress should you allow (center to center) to minimize interference? 60 Hz 250 to 500 Hz Approximately 3 kHz Approximately 6 kHz BG2B07XXXNWhat is an azimuthal map? A map projection centered on the North Pole A map projection centered on a particular location, used to determine the shortest path between points on the surface of the earthA 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 orbitBG2B08XXXNWhat is the most useful type of map to use when orienting a directional HF antenna toward a distant station? Azimuthal Mercator Polar projection Topographical AG2B09XXXNA directional antenna pointed in the long-path direction to another station is generally oriented how many degrees from its short-path heading? 45 degrees 90 degrees 180 degrees 270 degrees CG2B10XXXNWhat is a band plan? A guideline for using different operating modes within an amateur band A guideline for deviating from FCC amateur frequency band allocations A plan of operating schedules within an amateur band published by the FCC A plan devised by a club to best use a frequency band during a contest AG2B11XXXNIn which International Telecommunication Union Region is the continental United States? Region 1 Region 2 Region 3 Region 4 BG2C01XXXNWhat means may an amateur station in distress use to attract attention, make known its condition and location, and obtain assistance? Only Morse code signals sent on internationally recognized emergency channels Any means of radiocommunication, but only on internationally recognized emergency channels Any means of radiocommunication Only those means of radiocommunication for which the station is licensed CG2C02XXXNDuring a disaster in the US, when may an amateur station make transmissions necessary to meet essential communication needs and assist relief operations? When normal communication systems are overloaded, damaged or disrupted Only when the local RACES net is activated Never; only official emergency stations may transmit in a disaster When normal communication systems are working but are not convenient AG2C03XXXNIf a disaster disrupts normal communications in your area, what may the FCC do? Declare a temporary state of communication emergency Temporarily seize your equipment for use in disaster communications Order all stations across the country to stop transmitting at once Nothing until the President declares the area a disaster area AG2C04XXXNIf a disaster disrupts normal communications in an area, what would the FCC include in any notice of a temporary state of communication emergency? Any additional test questions needed for the licensing of amateur emergency communications workers A list of organizations authorized to temporarily seize your equipment for disaster communications Any special conditions requiring the use of non-commercial power systems Any special conditions and special rules to be observed by stations during the emergency DG2C05XXXNDuring an emergency, what power output limitations must be observed by a station in distress? 200 watts PEP 1500 watts PEP 1000 watts PEP during daylight hours, reduced to 200 watts PEP during the night There are no limitations during an emergency DG2C06XXXNDuring a disaster in the US, what frequencies may be used to obtain assistance? Only frequencies in the 80-meter band Only frequencies in the 40-meter band Any frequency Any United Nations approved frequency CG2C07XXXNIf you are communicating with another amateur station and hear a station in distress break in, what should you do? Continue your communication because you were on frequency first Acknowledge the station in distress and determine its location and what assistance may be needed Change to a different frequency so the station in distress may have a clear channel to call for assistance Immediately cease all transmissions because stations in distress have emergency rights to the frequency BG2C08XXXNWhy do stations in the Radio Amateur Civil Emergency Service (RACES) participate in training tests and drills? To practice orderly and efficient operations for the civil defense organization they serve To ensure that members attend monthly on-the-air meetings To ensure that RACES members are able to conduct tests and drills To acquaint members of RACES with other members they may meet in an emergency AG2C09XXXNWhat type of messages may be transmitted to an amateur station in a foreign country? Messages of any type Messages that are not religious, political, or patriotic in nature Messages of a technical nature or personal remarks of relative unimportance Messages of any type, but only if the foreign country has a third-party communications agreement with the US CG2C10XXXNWhat is the Amateur Auxiliary to the FCC's Field Operations Bureau? Amateur volunteers who are formally enlisted to monitor the airwaves for rules violations Amateur volunteers who conduct amateur licensing examinations Amateur volunteers who conduct frequency coordination for amateur VHF repeaters Amateur volunteers who use their station equipment to help civil defense organizations in times of emergency AG2C11XXXNWhat are the objectives of the Amateur Auxiliary to the FCC's Field Operations Bureau? To conduct efficient and orderly amateur licensing examinations To encourage amateur self-regulation and compliance with the rules To coordinate repeaters for efficient and orderly spectrum usage To provide emergency and public safety communications BG3A01XXXNWhat can be done at an amateur station to continue communications during a sudden ionospheric disturbance? Try a higher frequency Try the other sideband Try a different antenna polarization Try a different frequency shift AG3A02XXXNWhat effect does a sudden ionospheric disturbance have on the daylight ionospheric propagation of HF radio waves? It disrupts higher-latitude paths more than lower-latitude paths It disrupts signals on lower frequencies more than those on higher frequencies It disrupts communications via satellite more than direct communications None, only areas on the night side of the earth are affected BG3A03XXXNHow long does it take the increased ultraviolet and X-ray radiation from solar flares to affect radio-wave propagation on the earth? The effect is instantaneous 1.5 seconds 8 minutes 20 to 40 hours CG3A04XXXNWhat 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 BG3A05XXXNWhat is the solar-flux index? A measure of solar activity that is taken annually A measure 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 at a specific frequency DG3A06XXXNWhat 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 DG3A07XXXNAt which latitudes are propagation paths more sensitive to geomagnetic disturbances? Those greater than 45 degrees latitude Those between 5 and 45 degrees latitude Those near the equator All paths are affected equally AG3A08XXXNWhat can be the effect of a major geomagnetic storm on radio-wave propagation? Improved high-latitude HF propagation Degraded high-latitude HF propagation Improved ground-wave propagation Improved chances of UHF ducting BG3A09XXXNWhat influences all radio communication beyond ground-wave or line-of-sight ranges? Solar activity Lunar tidal effects The F1 region of the ionosphere The F2 region of the ionosphere AG3A10XXXNWhich two types of radiation from the sun influence propagation? Subaudible- and audio-frequency emissions Electromagnetic and particle emissions Polar-region and equatorial emissions Infrared and gamma-ray emissions BG3A11XXXNWhen sunspot numbers are high, how is the ionosphere affected? High-frequency radio signals are absorbed Frequencies up to 100 MHz or higher are normally usable for long-distance communication Frequencies up to 40 MHz or higher are normally usable for long-distance communication High-frequency radio signals become weak and distorted CG3B01XXXNIf the maximum usable frequency on the path from Minnesota to France is 22 MHz, which band should offer the best chance for a successful contact? 10 meters 15 meters 20 meters 40 Meters BG3B02XXXNIf the maximum usable frequency on the path from Ohio to Germany is 17 MHz, which band should offer the best chance for a successful contact? 80 meters 40 meters 20 meters 2 meters CG3B03XXXNIf the maximum usable frequency (MUF) is high and HF radio-wave propagation is generally good for several days, a similar condition can usually be expected how many days later? 7 14 28 90 CG3B04XXXNWhat is one way to determine if the maximum usable frequency (MUF) is high enough to support 28-MHz propagation between your station and western Europe? Listen for signals on the 10-meter beacon frequency Listen for signals on the 20-meter beacon frequency Listen for signals on the 39-meter broadcast frequency Listen for WWVH time signals on 20 MHz AG3B05XXXNWhat usually happens to radio waves with frequencies below the maximum usable frequency (MUF) when they are sent into the ionosphere? They are bent back to the earth They pass through the ionosphere They are completely absorbed by the ionosphere They are changed to a frequency above the MUF AG3B06XXXNWhere would you tune to hear beacons that would help you determine propagation conditions on the 20-meter band? 28.2 MHz 21.1 MHz 14.1 MHz 14.2 MHz CG3B07XXXNDuring periods of low solar activity, which frequencies are the least reliable for long-distance communication? Frequencies below 3.5 MHz Frequencies near 3.5 MHz Frequencies on or above 10 MHz Frequencies above 20 MHz DG3B08XXXNAt what point in the solar cycle does the 20-meter band usually support worldwide propagation during daylight hours? At the summer solstice Only at the maximum point of the solar cycle Only at the minimum point of the solar cycle At any point in the solar cycle DG3B09XXXNWhat is one characteristic of gray-line propagation? It is very efficient It improves local communications It is very poor It increases D-region absorption AG3B10XXXNWhat is the maximum distance along the earth's surface that is normally covered in one hop using the F2 region? 180 miles 1200 miles 2500 miles None; the F2 region does not support radio-wave propagation CG3B11XXXNWhat is the maximum distance along the earth's surface that is normally covered in one hop using the E region? 180 miles 1200 miles 2500 miles None; the E region does not support radio-wave propagation BG3C01XXXNWhat is the average height of maximum ionization of the E region? 45 miles 70 miles 200 miles 1200 miles BG3C02XXXNWhen can the F2 region be expected to reach its maximum height at your location? At noon during the summer At midnight during the summer At dusk in the spring and fall At noon during the winter AG3C03XXXNWhy is the F2 region mainly responsible for the longest-distance radio-wave propagation? Because it exists only at night Because it is the lowest ionospheric region Because it is the highest ionospheric region Because it does not absorb radio waves as much as other ionospheric regions CG3C04XXXNWhat is the "critical angle" as used in radio-wave propagation? The lowest takeoff angle that will return a radio wave to the earth under specific ionospheric conditions The compass direction of a distant station The compass direction opposite that of a distant station The highest takeoff angle that will return a radio wave to the earth under specific ionospheric conditions DG3C05XXXNWhat is the main reason the 160-, 80- and 40-meter amateur bands tend to be useful only for short-distance communications during daylight hours? Because of a lack of activity Because of auroral propagation Because of D-region absorption Because of magnetic flux CG3C06XXXNWhat is a characteristic of HF scatter signals? High intelligibility A wavering sound Reversed modulation Reversed sidebands BG3C07XXXNWhat makes HF scatter signals often sound distorted? Auroral activity and changes in the earth's magnetic field Propagation through ground waves that absorb much of the signal The state of the E-region at the point of refraction Energy scattered into the skip zone through several radio-wave paths DG3C08XXXNWhy are HF scatter signals usually weak? Only a small part of the signal energy is scattered into the skip zone Auroral activity absorbs most of the signal energy Propagation through ground waves absorbs most of the signal energy The F region of the ionosphere absorbs most of the signal energy AG3C09XXXNWhat type of radio-wave propagation 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 BG3C10XXXNWhen does scatter propagation on the HF bands most often occur? When the sunspot cycle is at a minimum and D-region absorption is high At night When the F1 and F2 regions are combined When communicating on frequencies above the maximum usable frequency (MUF) DG3C11XXXNWhat type of signal fading occurs when two or more parts of a radio wave follow different paths? Multipath interference Multimode interference Selective Interference Ionospheric interference AG4A01XXXNWhat 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 CG4A02XXXNWhen testing the amplitude linearity of a single-sideband transmitter, what kind of audio tones are fed into the microphone input and on what kind of instrument is the output observed? Two harmonically related tones are fed in, and the output is observed on an oscilloscope Two harmonically related tones are fed in, and the output is observed on a distortion analyzer Two non-harmonically related tones are fed in, and the output is observed on an oscilloscope Two non-harmonically related tones are fed in, and the output is observed on a distortion analyzer CG4A03XXXNWhat audio frequencies are used in a two-tone test of the linearity of a single-sideband phone transmitter? 20 Hz and 20 kHz 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 DG4A04XXXNWhat measurement can be made of a single-sideband phone transmitter's amplifier by performing a two-tone test using an oscilloscope? Its percent of frequency modulation Its percent of carrier phase shift Its frequency deviation Its linearity DG4A05XXXNAt what point in an HF transceiver block diagram would an electronic TR switch normally appear? Between the transmitter and low-pass filter Between the low-pass filter and antenna At the antenna feed point At the power-supply feed point AG4A06XXXNWhy is an electronic TR switch preferable to a mechanical one? It allows greater receiver sensitivity Its circuitry is simpler It has a higher operating speed It allows cleaner output signals CG4A07XXXNAs a power amplifier is tuned, what reading on its grid-current meter indicates the best neutralization? A minimum change in grid current as the output circuit is changed A maximum change in grid current as the output circuit is changed Minimum grid current Maximum grid current AG4A08XXXNWhy is neutralization necessary for some vacuum-tube amplifiers? To reduce the limits of loaded Q To reduce grid-to-cathode leakage To cancel AC hum from the filament transformer To cancel oscillation caused by the effects of interelectrode capacitance DG4A09XXXNIn a properly neutralized RF amplifier, what type of feedback is used? 5% 10% Negative Positive CG4A10XXXNWhat does a neutralizing circuit do in an RF amplifier? It controls differential gain It cancels the effects of positive feedback It eliminates AC hum from the power supply It reduces incidental grid modulation BG4A11XXXNWhat is the reason for neutralizing the final amplifier stage of a transmitter? To limit the modulation index To eliminate self oscillations To cut off the final amplifier during standby periods To keep the carrier on frequency BG4B01XXXNWhat item of test equipment contains horizontal- and vertical-channel amplifiers? An ohmmeter A signal generator An ammeter An oscilloscope DG4B02XXXNHow would a signal tracer normally be used? To identify the source of radio transmissions To make exact drawings of signal waveforms To show standing wave patterns on open-wire feed lines To identify an inoperative stage in a receiver DG4B03XXXNWhy would you use an antenna noise bridge? To measure the noise figure of an antenna or other electrical circuit To measure the impedance of an antenna or other electrical circuit To cancel electrical noise picked up by an antenna To tune out noise in a receiver BG4B04XXXNHow is an antenna noise bridge normally used? It is connected at an antenna's feed point and reads the antenna's noise figure It is connected between a transmitter and an antenna and is tuned for minimum SWR It is connected between a receiver and an unknown impedance and is tuned for minimum noise It is connected between an antenna and ground and is tuned for minimum SWR CG4B05XXXNWhat is the best instrument to use to check the signal quality of a CW or single-sideband phone transmitter? A monitoring oscilloscope A field-strength meter A sidetone monitor A signal tracer and an audio amplifier AG4B06XXXNWhat signal source is connected to the vertical input of a monitoring oscilloscope when checking the quality of a transmitted signal? The IF output of a monitoring receiver The audio input of the transmitter The RF signals of a nearby receiving antenna The RF output of the transmitter DG4B07XXXNWhat instrument can be used to determine the horizontal radiation pattern of an antenna? A field-strength meter A grid-dip meter An oscilloscope A signal tracer and an audio amplifier AG4B08XXXNHow is a field-strength meter normally used? To determine the standing-wave ratio on a transmission line To check the output modulation of a transmitter To monitor relative RF output To increase average transmitter output CG4B09XXXNWhat simple instrument may be used to monitor relative RF output during antenna and transmitter adjustments? A field-strength meter An antenna noise bridge A multimeter A metronome AG4B10XXXNIf the power output of a transmitter is increased by four times, how might a nearby receiver's S-meter reading 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 BG4B11XXXNBy how many times must the power output of a transmitter be increased to raise the S-meter reading on a nearby receiver from S8 to S9? Approximately 2 times Approximately 3 times Approximately 4 times Approximately 5 times CG4C01XXXNWhat devices would you install to reduce or eliminate audio-frequency interference to home-entertainment systems? Bypass inductors Bypass capacitors Metal-oxide varistors Bypass resistors BG4C02XXXNWhat should be done if a properly operating amateur station is the cause of interference to a nearby telephone? Make internal adjustments to the telephone equipment Ask the telephone company to install RFI filters Stop transmitting whenever the telephone is in use Ground and shield the local telephone distribution amplifier BG4C03XXXNWhat sound is heard from a public-address system if audio rectification of a nearby single-sideband phone transmission occurs? A steady hum whenever 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 CG4C04XXXNWhat sound is heard from a public-address system if audio rectification of a nearby CW transmission occurs? On-and-off humming or clicking Audible, possibly distorted speech Muffled, severely distorted speech A steady whistling AG4C05XXXNHow can you minimize the possibility of audio rectification of your transmitter's signals? By using a solid-state transmitter By using CW emission only By ensuring that all station equipment is properly grounded By installing bypass capacitors on all power supply rectifiers CG4C06XXXNIf your third-floor amateur station has a ground wire running 33 feet down to a ground rod, why might you get an RF burn if you touch the front panel of your HF transceiver? Because the ground rod is not making good contact with moist earth Because the transceiver's heat-sensing circuit is not working to start the cooling fan Because of a bad antenna connection, allowing the RF energy to take an easier path out of the transceiver through you Because the ground wire is a resonant length on several HF bands and acts more like an antenna than an RF ground connection DG4C07XXXNWhat is NOT an important reason to have a good station ground? To reduce the cost of operating a station To reduce electrical noise To reduce interference To reduce the possibility of electric shock AG4C08XXXNWhat is one good way to avoid stray RF energy in your amateur station? Keep the station's ground wire as short as possible Use a beryllium ground wire for best conductivity Drive the ground rod at least 14 feet into the ground Make a couple of loops in the ground wire where it connects to your station AG4C09XXXNWhich statement about station grounding is NOT true? Braid from RG-213 coaxial cable makes a good conductor to tie station equipment together into a station groundOnly transceivers and power amplifiers need to be tied into a station ground According to the National Electrical Code, there should be only one grounding system in a building The minimum length for a good ground rod is 8 feet BG4C10XXXNWhich statement about station grounding is true? The chassis of each piece of station equipment should be tied together with high-impedance conductors If the chassis of all station equipment is connected with a good conductor, there is no need to tie them to an earth ground RF hot spots can occur in a station located above the ground floor if the equipment is grounded by a long ground wire A ground loop is an effective way to ground station equipment CG4C11XXXNWhich of the following is NOT covered in the National Electrical Code? Minimum conductor sizes for different lengths of amateur antennas The size and composition of grounding conductors Electrical safety inside the ham shack The RF exposure limits of the human body DG4D01XXXNWhat is the reason for using a properly adjusted speech processor with a single-sideband phone transmitter? It reduces average transmitter power requirements It reduces unwanted noise pickup from the microphone It improves voice frequency fidelity It improves signal intelligibility at the receiver DG4D02XXXNIf a single-sideband phone transmitter is 100% modulated, what will a speech processor do to the transmitter's power? It will increase the output PEP It will add nothing to the output PEP It will decrease the peak power output It will decrease the average power output BG4D03XXXNHow is the output PEP of a transmitter calculated if an oscilloscope is used to measure the transmitter's peak load voltage across a resistive load? PEP = [(Vp)(Vp)] / (RL) PEP = [(0.707 PEV)(0.707 PEV)] / RL PEP = (Vp)(Vp)(RL) PEP = [(1.414 PEV)(1.414 PEV)] / RL BG4D04XXXNWhat is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm resistor connected to the transmitter output? 100 watts 200 watts 400 watts 1000 watts AG4D05XXXNWhat is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm resistor connected to the transmitter output? 500 watts 625 watts 1250 watts 2500 watts BG4D06XXXNWhat is the output PEP of an unmodulated carrier transmitter if an average-reading wattmeter connected to the transmitter output indicates 1060 watts? 530 watts 1060 watts 1500 watts 2120 watts BG4D07XXXNWhich wires in a four-conductor line cord should be attached to fuses in a 240-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 AG4D08XXXNWhat size wire is normally used on a 15-ampere, 120-VAC household lighting circuit? AWG number 14 AWG number 16 AWG number 18 AWG number 22 AG4D09XXXNWhat size wire is normally used on a 20-ampere, 120-VAC household appliance circuit? AWG number 20 AWG number 16 AWG number 14 AWG number 12 DG4D10XXXNWhat maximum size fuse or circuit breaker should be used in a household appliance circuit using AWG number 12 wiring? 100 amperes 60 amperes 30 amperes 20 amperes DG4D11XXXNWhat maximum size fuse or circuit breaker should be used in a household appliance circuit using AWG number 14 wiring? 15 amperes 20 amperes 30 amperes 60 amperes AG4E01XXXNDepending on the wavelength of the signal, the energy density of the RF field, and other factors, in what way can RF energy affect body tissue? It heats the tissue It causes radiation poisoning It causes blood flow to stop It produces genetic changes in the tissue AG4E02XXXNIf you operate your amateur station with indoor antennas, what precautions should you take when you install them? Locate the antennas close to your operating position to minimize feed-line length Position the antennas along the edge of a wall where it meets the floor or ceiling to reduce parasitic radiation Locate the antennas as far away as possible from living spaces that will be occupied while you are operating Position the antennas parallel to electrical power wires to take advantage of parasitic effects CG4E03XXXNWhat precaution should you take whenever you make adjustments to the feed system of a parabolic dish antenna? Be sure no one can activate the transmitter Disconnect the antenna-positioning mechanism Point the dish away from the sun so it doesn't concentrate solar energy on you Be sure you and the antenna structure are properly grounded AG4E04XXXNWhat is one important thing to consider when using an indoor antenna? Use stranded wire to reduce stray RF Ensure that the antenna is as far away from people as possible Use only a Yagi antenna to direct the signals away from people Use as much power as possible to ensure that your signal gets out BG4E05XXXNWhy should a protective fence be placed around the base of a ground-mounted parabolic dish transmitting antenna? To reduce the possibility of persons being harmed by RF energy during transmissions To reduce the possibility that animals will damage the antenna To increase the property value through increased security awareness To protect the antenna from lightning damage and provide a good ground system for the installation AG4E06XXXNWhat RF-safety precautions should you take before beginning repairs on an antenna? Be sure you and the antenna structure are grounded Be sure to turn off the transmitter and disconnect the feed line Inform your neighbors so they are aware of your intentions Turn off the main power switch in your house BG4E07XXXNWhat precaution should you take when installing a ground-mounted antenna? It should not be installed higher than you can reach It should not be installed in a wet area It should be painted so people or animals do not accidentally run into it It should be installed so no one can come in contact with it DG4E08XXXNWhat precautions should you take before beginning repairs on a microwave feed horn or waveguide? Be sure to wear tight-fitting clothes and gloves to protect your body and hands from sharp edges Be sure the transmitter is turned off and the power source is disconnected Be sure the weather is dry and sunny Be sure propagation conditions are unfavorable for tropospheric ducting BG4E09XXXNWhy should directional high-gain antennas be mounted higher than nearby structures? So they will be dried by the wind after a heavy rain storm So they will not damage nearby structures with RF energy So they will receive more sky waves and fewer ground waves So they will not direct RF energy toward people in nearby structures DG4E10XXXNFor best RF safety, where should the ends and center of a dipole antenna be located? Near or over moist ground so RF energy will be radiated away from the ground As close to the transmitter as possible so RF energy will be concentrated near the transmitter As high as possible to prevent people from coming in contact with the antenna Close to the ground so simple adjustments can be easily made without climbing a ladder CG4E11XXXNWhich property of RF energy is NOT important in estimating the energy's effect on body tissue? The polarization The critical angle The power density The frequency BG5A01XXXNWhat is impedance? The electric charge stored by 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 between one electric field and another with the same charge CG5A02XXXNWhat is 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 BG5A03XXXNIn an inductor, what causes opposition to the flow of AC? Resistance Reluctance Admittance Reactance DG5A04XXXNIn a capacitor, what causes opposition to the flow of AC? Resistance Reluctance Reactance Admittance CG5A05XXXNHow 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 increases As the amplitude of the applied AC increases, the reactance decreases As the frequency of the applied AC increases, the reactance increases DG5A06XXXNHow 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 increases As the amplitude of the applied AC increases, the reactance decreases AG5A07XXXNWhen will a power source deliver maximum output to the load? When the impedance of the load is equal to the impedance of the source When the load resistance is infinite When the power-supply fuse rating equals the primary winding current When air wound transformers are used instead of iron-core transformers AG5A08XXXNWhat happens 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 The electrical load is shorted No current can flow through the circuit The source delivers maximum power to the load DG5A09XXXNWhy is impedance matching important? 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 AG5A10XXXNWhat unit is used to measure reactance? Mho Ohm Ampere Siemens BG5A11XXXNWhat unit is used to measure impedance? Volt Ohm Ampere Watt BG5B01XXXNA two-times increase in power results in a change of how many dB? 1 dB higher 3 dB higher 6 dB higher 12 dB higher BG5B02XXXNHow can you decrease your transmitter's power by 3 dB? Divide the original power by 1.5 Divide the original power by 2 Divide the original power by 3 Divide the original power by 4 BG5B03XXXNHow can you increase your transmitter's power by 6 dB? Multiply the original power by 1.5 Multiply the original power by 2 Multiply the original power by 3 Multiply the original power by 4 DG5B04XXXNIf a signal-strength report is "10 dB over S9", what should the report be if the transmitter power is reduced from 1500 watts to 150 watts? S5 S7 S9 S9 plus 5 dB CG5B05XXXNIf a signal-strength report is "20 dB over S9", what should the report be if the transmitter power is reduced from 1500 watts to 15 watts? S5 S7 S9 S9 plus 10 dB CG5B06XXXNIf 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 DG5B07XXXNIn a parallel circuit with a voltage source and several branch resistors, how is the total current related to the current in the branch resistors? It equals the average of the branch current through each resistor It equals the sum of the branch current through each resistor It decreases as more parallel resistors are added to the circuit It is the sum of each resistor's voltage drop multiplied by the total number of resistors BG5B08XXXNHow many watts of electrical power are used if 400 VDC is supplied to an 800-ohm load? 0.5 watts 200 watts 400 watts 320,000 watts BG5B09XXXNHow many watts of electrical power are used by a 12-VDC light bulb that draws 0.2 amperes? 60 watts 24 watts 6 watts 2.4 watts DG5B10XXXNHow many watts are being dissipated when 7.0 milliamperes flow through 1.25 kilohms? Approximately 61 milliwatts Approximately 39 milliwatts Approximately 11 milliwatts Approximately 9 milliwatts AG5B11XXXNWhat is the voltage across a 500-turn secondary winding in a transformer if the 2250-turn primary is connected to 120 VAC? 2370 volts 540 volts 26.7 volts 5.9 volts CG5B12XXXNWhat is the turns ratio of a transformer to match an audio amplifier having a 600-ohm output impedance to a speaker having a 4-ohm impedance? 12.2 to 1 24.4 to 1 150 to 1 300 to 1 AG5B13XXXNWhat is the impedance of a speaker that 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 DG5B14XXXNA DC voltage equal to what value of an applied sine-wave AC voltage would produce the same amount of heat over time in a resistive element? The peak-to-peak value The RMS value The average value The peak value BG5B15XXXNWhat is the peak-to-peak voltage of a sine wave that has an RMS voltage of 120 volts? 84.8 volts 169.7 volts 204.8 volts 339.4 volts DG5B16XXXNA sine wave of 17 volts peak is equivalent to how many volts RMS? 8.5 volts 12 volts 24 volts 34 volts BG6A01XXXNIf a carbon resistor's temperature is increased, what will happen to the resistance? It will increase by 20% for every 10 degrees centigrade It will stay the same It will change depending on the resistor's temperature coefficient rating It will become time dependent CG6A02XXXNWhat type of capacitor is often used in power-supply circuits to filter the rectified AC? Disc ceramic Vacuum variable Mica Electrolytic DG6A03XXXNWhat type of capacitor is used in power-supply circuits to filter transient voltage spikes across the transformer's secondary winding? High-value Trimmer Vacuum variable Suppressor DG6A04XXXNWhere is the source of energy connected in a transformer? To the secondary winding To the primary winding To the core To the plates BG6A05XXXNIf no load is attached to the secondary winding of a transformer, what is current in the primary winding called? Magnetizing current Direct current Excitation current Stabilizing current AG6A06XXXNWhat is the peak-inverse-voltage rating of a power-supply rectifier? The maximum transient voltage the rectifier will handle in the conducting direction 1.4 times the AC frequency The maximum voltage the rectifier will handle in the non-conducting direction 2.8 times the AC frequency CG6A07XXXNWhat are the two major ratings that must not be exceeded for silicon-diode rectifiers used in power-supply circuits? Peak inverse voltage; average forward current Average power; average voltage Capacitive reactance; avalanche voltage Peak load impedance; peak voltage AG6A08XXXNWhy 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 AG6A09XXXNWhat is the output waveform of an unfiltered full-wave rectifier connected to a resistive load? A series of pulses at twice the frequency of the AC input A series of pulses at the same frequency as the AC input A sine wave at half the frequency of the AC input A steady DC voltage AG6A10XXXNA half-wave rectifier conducts during how many degrees of each cycle? 90 degrees 180 degrees 270 degrees 360 degrees BG6A11XXXNA full-wave rectifier conducts during how many degrees of each cycle? 90 degrees 180 degrees 270 degrees 360 degrees DG7A01XXXNWhat safety feature does a power-supply bleeder resistor provide? It improves voltage regulation It discharges the filter capacitors It removes shock hazards from the induction coils It eliminates ground-loop current BG7A02XXXNWhere is a power-supply bleeder resistor connected? Across the filter capacitor Across the power-supply input Between the transformer primary and secondary windings Across the inductor in the output filter AG7A03XXXNWhat components are used in a power-supply filter network? Diodes Transformers and transistors Quartz crystals Capacitors and inductors DG7A04XXXNWhat 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 DG7A05XXXNWhat 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 DG7A06XXXNWhat should be the impedance of a low-pass filter 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 BG7A07XXXNIn a typical single-sideband phone transmitter, what circuit processes signals from the balanced modulator and sends signals to the mixer? Carrier oscillator Filter IF amplifier RF amplifier BG7A08XXXNIn a single-sideband phone transmitter, what circuit processes signals from the carrier oscillator and the speech amplifier and sends signals to the filter? Mixer Detector IF amplifier Balanced modulator DG7A09XXXNIn a single-sideband phone superheterodyne receiver, what circuit processes signals from the RF amplifier and the local oscillator and sends signals to the IF filter? Balanced modulator IF amplifier Mixer Detector CG7A10XXXNIn a single-sideband phone superheterodyne receiver, what circuit processes signals from the IF amplifier and the BFO and sends signals to the AF amplifier? RF oscillator IF filter Balanced modulator Detector DG7A11XXXNIn a single-sideband phone superheterodyne receiver, what circuit processes signals from the IF filter and sends signals to the detector? RF oscillator IF amplifier Mixer BFO BG8A01XXXNWhat type of modulation system changes the amplitude of an RF wave for the purpose of conveying information? Frequency modulation Phase modulation Amplitude-rectification modulation Amplitude modulation DG8A02XXXNWhat type of modulation system changes the phase of an RF wave for the purpose of conveying information? Pulse modulation Phase modulation Phase-rectification modulation Amplitude modulation BG8A03XXXNWhat type of modulation system changes the frequency of an RF wave for the purpose of conveying information? Phase-rectification modulation Frequency-rectification modulation Amplitude modulation Frequency modulation DG8A04XXXNWhat emission is produced by a reactance modulator connected to an RF power amplifier? Multiplex modulation Phase modulation Amplitude modulation Pulse modulation BG8A05XXXNwhat emission type does the instantaneous amplitude (envelope) of the RF signal vary in accordance with the modulating audio? Frequency shift keying Pulse modulation Frequency modulation Amplitude modulation DG8A06XXXNHow much is the carrier suppressed below peak output power in a single-sideband phone transmission? No more than 20 dB No more than 30 dB At least 40 dB At least 60 dB CG8A07XXXNWhat 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 CG8A08XXXNWhich popular phone emission uses the narrowest frequency bandwidth? Single-sideband Double-sideband Phase-modulated Frequency-modulated AG8A09XXXNWhat happens to the signal of an overmodulated single-sideband or double-sideband phone transmitter? It becomes louder with no other effects It occupies less bandwidth with poor high-frequency response It has higher fidelity and improved signal-to-noise ratio It becomes distorted and occupies more bandwidth DG8A10XXXNHow 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 BG8A11XXXNWhat is meant by 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 CG8B01XXXNWhat receiver stage combines a 14.25-MHz input signal with a 13.795-MHz oscillator signal to produce a 455-kHz intermediate frequency (IF) signal? Mixer BFO VFO Multiplier AG8B02XXXNIf a receiver mixes a 13.800-MHz VFO with a 14.255-MHz received signal to produce a 455-kHz intermediate frequency (IF) signal, what type of interference will a 13.345-MHz signal produce in the receiver? Local oscillator Image response Mixer interference Intermediate interference BG8B03XXXNWhat stage in a transmitter would change a 5.3-MHz input signal to 14.3 MHz? A mixer A beat frequency oscillator A frequency multiplier A linear translator AG8B04XXXNWhat is the name of the stage in a VHF FM transmitter that selects a harmonic of an HF signal to reach the desired operating frequency? Mixer Reactance modulator Preemphasis network Multiplier DG8B05XXXNWhy isn't frequency modulated (FM) phone used below 29.5 MHz? The transmitter efficiency for this mode is low Harmonics could not be attenuated to practical levels The bandwidth would exceed FCC limits The frequency stability would not be adequate CG8B06XXXNWhat 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 DG8B07XXXNWhat 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 BG8B08XXXNHow 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 CG8B09XXXNWhat do RTTY, Morse code, AMTOR and packet communications have in common? They are multipath communications They are digital communications They are analog communications They are only for emergency communications BG8B10XXXNWhat is the duty cycle required of a transmitter when sending Mode B (FEC) AMTOR? 50% 75% 100% 125% CG8B11XXXNIn what segment of the 20-meter band are most AMTOR operations found? At the bottom of the slow-scan TV segment, near 14.230 MHz At the top of the SSB phone segment, near 14.325 MHz In the middle of the CW segment, near 14.100 MHz At the bottom of the RTTY segment, near 14.075 MHz DG9A01XXXNHow can the SWR 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 AG9A02XXXNApproximately how long is the driven element of a Yagi antenna for 14.0 MHz? 17 feet 33 feet 35 feet 66 feet BG9A03XXXNApproximately how long is the director element of a Yagi antenna for 21.1 MHz? 42 feet 21 feet 17 feet 10.5 feet BG9A04XXXNApproximately how long is the reflector element of a Yagi antenna for 28.1 MHz? 8.75 feet 16.6 feet 17.5 feet 35 feet CG9A05XXXNWhich statement about a three-element Yagi antenna is true? The reflector is normally the shortest parasitic element The director is normally the shortest parasitic element The driven element is the longest parasitic element Low feed-point impedance increases bandwidth BG9A06XXXNWhat is one effect of increasing the boom length and adding directors to a Yagi antenna? Gain increases SWR increases Weight decreases Windload decreases AG9A07XXXNWhat are some advantages of a Yagi with wide element spacing? High gain, lower loss and a low SWR High front-to-back ratio and lower input resistance Shorter boom length, lower weight and wind resistance High gain, less critical tuning and wider bandwidth DG9A08XXXNWhy is a Yagi antenna often used for radio communications on the 20-meter 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 helps reduce interference from other stations off to the side or behind It provides the highest possible angle of radiation for the HF bands CG9A09XXXNWhat does "antenna front-to-back ratio" mean in reference to a Yagi antenna? 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 CG9A10XXXNWhat is the "main lobe" of a Yagi antenna radiation pattern? The direction of least radiation from the antenna The point of maximum current in a radiating antenna element The direction of maximum radiated field strength from the antenna The maximum voltage standing wave point on a radiating element CG9A11XXXNWhat is a good way to get maximum performance from a Yagi antenna? Optimize the lengths and spacing of the elements Use RG-58 feed line Use a reactance bridge to measure the antenna performance from each direction around the antenna Avoid using towers higher than 30 feet above the ground AG9B01XXXNApproximately how 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 BG9B02XXXNApproximately how long is each side of a cubical-quad antenna driven element for 14.3 MHz? 17.6 feet 23.4 feet 70.3 feet 175 feet AG9B03XXXNApproximately how 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 BG9B04XXXNApproximately how long is each leg of a symmetrical delta-loop antenna driven element for 28.7 MHz? 8.75 feet 11.7 feet 23.4 feet 35 feet BG9B05XXXNApproximately how long is each leg of a symmetrical delta-loop antenna driven element for 24.9 MHz? 10.99 feet 12.95 feet 13.45 feet 40.36 feet CG9B06XXXNApproximately how 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 CG9B07XXXNWhich statement about two-element delta loops and quad antennas is true? They compare favorably with a three-element Yagi They perform poorly above HF They perform very well only at HF They are effective only when constructed using insulated wire AG9B08XXXNCompared to a dipole antenna, what are the directional radiation characteristics of a cubical-quad 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 CG9B09XXXNMoving the feed point of a multielement quad antenna from a side parallel to the ground to a side perpendicular to the ground will have what effect? It will significantly increase the antenna feed-point impedance It will significantly decrease the antenna feed-point impedance It will change the antenna polarization from vertical to horizontal It will change the antenna polarization from horizontal to vertical DG9B10XXXNWhat does the term "antenna front-to-back ratio" mean in reference to a delta-loop antenna? 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 CG9B11XXXNWhat is the "main lobe" of a delta-loop antenna radiation pattern? 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 the antenna The maximum voltage standing wave point on a radiating element CG9C01XXXNWhat type of multiband transmitting antenna does NOT require a feed line? A random-wire antenna A triband Yagi antenna A delta-loop antenna A Beverage antenna AG9C02XXXNWhat is one advantage of using a random-wire antenna? It is more efficient than any other kind of antenna It will keep RF energy out of your station It doesn't need an impedance matching network It is a multiband antenna DG9C03XXXNWhat is one disadvantage of a random-wire antenna? It must be longer than 1 wavelength You may experience RF feedback in your station It usually produces vertically polarized radiation You must use an inverted-T matching network for multiband operation BG9C04XXXNWhat is an advantage of downward sloping radials on a ground-plane antenna? It lowers the radiation angle It brings the feed-point impedance closer to 300 ohms It increases the radiation angle It brings the feed-point impedance closer to 50 ohms DG9C05XXXNWhat happens to the feed-point impedance of a ground-plane antenna when its radials are changed from horizontal to downward- sloping? It decreases It increases It stays the same It approaches zero BG9C06XXXNWhat is the low-angle radiation pattern of an ideal half-wavelength dipole HF antenna installed parallel to the earth? It is a figure-eight at right angles to the antenna It is a figure-eight off both ends of the antenna It is a circle (equal radiation in all directions) It is two smaller lobes on one side of the antenna, and one larger lobe on the other side AG9C07XXXNHow does antenna height affect the horizontal (azimuthal) radiation pattern of a horizontal dipole HF antenna? If the antenna is too high, the pattern becomes unpredictable If the antenna is less than one-half wavelength high, reflected radio waves from the ground significantly distort the pattern Antenna height has no effect on the pattern If the antenna is less than one-half wavelength high, radiation off the ends of the wire is eliminated BG9C08XXXNIf a slightly shorter parasitic element is placed 0.1 wavelength away from an HF dipole antenna, what effect will this have on the antenna's radiation pattern? The radiation pattern will not be affected 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 A major lobe will develop in the horizontal plane, toward the parasitic element DG9C09XXXNIf a slightly longer parasitic element is placed 0.1 wavelength away from an HF dipole antenna, what effect will this have on the antenna's radiation pattern? The radiation pattern will not be affected A major lobe will develop in the horizontal plane, away from the parasitic element, toward the dipole A major lobe will develop in the vertical plane, away from the ground A major lobe will develop in the horizontal plane, parallel to the two elements BG9C10XXXNWhere should the radial wires of a ground-mounted vertical antenna system be placed? As high as possible above the ground On the surface or buried a few inches below the ground Parallel to the antenna element At the top of the antenna BG9D01XXXNWhat factors determine the characteristic impedance of a parallel-conductor antenna feed line? 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 AG9D02XXXNWhat is the typical characteristic impedance of coaxial cables used for antenna feed lines at amateur stations? 25 and 30 ohms 50 and 75 ohms 80 and 100 ohms 500 and 750 ohms BG9D03XXXNWhat is the characteristic impedance of flat-ribbon TV-type twinlead? 50 ohms 75 ohms 100 ohms 300 ohms DG9D04XXXNWhat is the typical 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 CG9D05XXXNWhat must be done 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 cut to an odd number of electrical quarter-wavelengths long The feed line must be cut to an even number of physical half- wavelengths long The antenna feed-point impedance must be matched to the characteristic impedance of the feed line DG9D06XXXNIf a center-fed dipole antenna is fed by parallel-conductor feed line, how would an inductively coupled matching network be used between the two? It would not normally be used with parallel-conductor feed lines It would be used to increase the SWR to an acceptable level It would be used to match the unbalanced transmitter output to the balanced parallel-conductor feed line It would be used at the antenna feed point to tune out the radiation resistance CG9D07XXXNIf a 160-meter signal and a 2-meter signal pass through the same coaxial cable, how will the attenuation of the two signals compare? It will be greater at 2 meters It will be less at 2 meters It will be the same at both frequencies It will depend on the emission type in use AG9D08XXXNIn what values are RF feed line losses usually expressed? Bels/1000 ft dB/1000 ft Bels/100 ft dB/100 ft DG9D09XXXNWhat standing-wave-ratio will result from the connection of a 50-ohm feed line to a resonant antenna having a 200-ohm feed-point impedance? 4:1 1:4 2:1 1:2 AG9D10XXXNWhat standing-wave-ratio will result from the connection of a 50-ohm feed line to a resonant antenna having a 10-ohm feed-point impedance? 2:1 50:1 1:5 5:1 DG9D11XXXNWhat standing-wave-ratio will result from the connection of a 50-ohm feed line to a resonant antenna having a 50-ohm feed-point impedance? 2:1 50:50 0:0 1:1 DG9D11XXXNWhat standing-wave-ratio will result from the connection of a 50-ohm feed line to a resonant antenna having a 50-ohm feed-point impedance? 2:1 50:50 0:0 1:1 D
