Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
328 Cards in this Set
- Front
- Back
|
Agency that regulates and enforces the Amateu radio in the U.S
|
FCC
|
|
|
For whom is the amateur radio service intened?
|
Persons interested in radio technology soley with personal aim and without pecuniary intest
|
|
|
How soon may you operate a transmitter on an amateur service frequency after you pass the exam for your 1st liccense
|
as soon as your name and call sign appear in the FCC's ULS database
|
|
|
Normal Term for an FCC-issued primary station/operator license grant?
|
ten (10) years
|
|
|
What is the grace period following the expiration of an amateur license within whihc the license may be renewed?
|
two (2) years
|
|
|
If your license has expired and is till within the allowable grace period, may you continue to operate a transmitter on amateur service frequencies?
|
No, must wait until the database has shown the renewal
|
|
|
What is the FCC Part 97 definition of an amateur station?
|
A station is an amateur Radio Service consisting of the apparatus necessary for carrying on rado communication
|
|
|
When is amateur station require to transmit its assigned call sign?
|
Every 10 minute during an at the end of contact
|
|
|
Which of the following is a valid US amateur radio staion call sign
|
In the US radio call signs begin with A,K,N or W and a single number 0 through 9
|
|
|
Whic of the following methods is encouraged by the FCC when Identifying your station when using phone?
|
Use of a phonetic alphabet
|
|
|
Which type of call sign has a single letter in both the prefix and suffix?
|
Special event call sign
|
|
|
For what purpose is a temporary "1 by 1" format(letter-number-letter) call sign assigned?
|
For operations in conjunction with an activity of special significance to the amateur community...limited event and time period
|
|
|
How many persons are required to be members of a club for a club station license to be issued by the FCC?
|
At lease 4
|
|
|
What type of ID is being used when Identifying a station on the air as "Race Headquarters?
|
Tactical Call
|
|
|
When using tatical Identifiers, how often must your station transmit the station's FCC-assigned call signal?
|
every 10 minutes
|
|
|
Which of the following formats of a self-assigned indicator is acceptable when Identifying using a phone transmision?
|
---stroke W3, ----slant W3 ---slash W3
|
|
|
What restrictions apply when appending a self-assigned call sign indicator?
|
Tactical Call signs are permitted as long as they don't sound like a US or forign call signIf must not conflict withh any other indicator specified by the FCC ruless or with any call sign prefix assigned to another country
|
|
|
What is ITU?
|
UN angency for information and communication technology issues
|
|
|
North American stations are located in which ITU region?
|
Region 2
|
|
|
What types of international communications are permitted by an FCC licensed amateur station?
|
Communication for purposes of amateur services and remarks of a personal character.... personal nature ... no business
|
|
|
Within which countried are FCC-license amateur stations prohibited from exchanging communications?
|
Any country whose adminstration has notified the ITU that it objects to such communication...no country currently, prohbit ham to ham communications
|
|
|
To which foreign stations do the FCC rules authorize the transmission of non-emergency third party communications?
|
Any station whose govenment permist such communications
|
|
|
From which of the following may an FCC-licensed amateur station transmitt, in addition to places where the FCC regulates communication
|
any vessel or aircraft located in international waters and documented or registered in the US
|
|
|
When are you allowed to operate your amateur station in a foreign country?
|
When the foreign country authorizes it.
|
|
|
On which occation may an FCC-licensed amateur station exchange messages with a U.S. military station?
|
During an Armed Forces Day Communication Test
|
|
|
When must an amateur station have a control operator?
|
only when the station is transmitting
|
|
|
Who is eligible to be the control operator of an amateur station?
|
ony the person for whom the amateur operator/primary station license grant appears in the FCC datase or who is authorized for alien reecipocal operation
|
|
|
Who may be he control operator of a station communicating through an amateur satillite or space station?
|
Any amateur whose license privileges alllows them to transmit on the satellite uplink frequeny
|
|
|
When the control operator is not the station licensee, who is responsible for the proper operation of the station?
|
The control operator and the station licensee are equally responsible
|
|
|
What determines the transmitting privileges of an amateur station?
|
the class of operator license held by the control operator
|
|
|
When may a technical class operator be the control operator of a station operating in an exclusive Amateur Extra Class operator segmetn of the amateur bands?
|
Never - you must stay within your technical class band privileges
|
|
|
What is an amateur station control point?
|
The locaton at which the control operator funcction is performed. The spot where your turn the equipjment on/off
|
|
|
What type of control is being used when transmitting using a handheld radio?
|
local control..."If you are at the controls, then its local control"
|
|
|
Under which type of control is it permissible for the control operator to be at a location other than the control point?
|
Automatic control
|
|
|
What type of control is used when the control operator is not at the station location, but can inderectly manipulated the operating adjustments of a station?
|
Remote control
|
|
|
What type of control is being used for a repeater when the control operator is not present at a control point?
|
Automatically Controlled
|
|
|
Who does the FCC presume to be the control operator of an amateur station, unless documentaion to the contrary is in the station records?
|
The station licensee
|
|
|
When may the control operator of an amateur station receive compensation for operating the station?
|
When communication is incidental to classroom instruction at an educational institution...when teaching a ham radio class...school teachers.
|
|
|
Who is accoutable should a repeater inadvertently retransmitt communications that violate the FCC rules?
|
The control operator of the originating station
|
|
|
Which part of the FCC rules contains the rules and regulations governing the Amateur Radio Service?
|
Part 97
|
|
|
Which type of transmisions is prohibited?
|
transmissions that contains obscene or indecent words or language
|
|
|
Whaat are the FCC rules regarding power levels used in the amateur bands?
|
use the minimum amount of powermust use the minimum transmission power necessary to carry out the desired communication
|
|
|
What is the meaning of the term broadcasting in the FCC rules for amateur service?
|
Transmission indendedd for reception by the general public
|
|
|
Under which circumstances are amateur stations authorized to transmit signals related to broadcasting, program producction, or new gathering, assuming no ohter means are available?
|
only when directly related to to the immediate safety of human life or protection of property.
|
|
|
Which of type of communication are permitted in the Amateur Radio Service?
|
Brief transmissions to make station adjustments
|
|
|
FCC definition of harmful interference, an example
|
that which serioulsy degrades, obstructs, or repeatedly interrups a radio communications service operating in accordance with the Radio Regulations
|
|
|
When is the transmission of codes or ciphers allowed to hide the meaning of a message transmitted by an amatetur station?
|
Only when transmitting contorl commands to sace stations or radio control craft
|
|
|
What is the only time an amateur station is authorized to transmit music?
|
when incidental to an authorized retransmission of a manned spacecraft communication
|
|
|
When may amateur radio operators use their stations to notify other amateurs of the availability of equptment for sale or trade
|
When the equipment is normally used in an amateur station and such activityis not on a regular basis
|
|
|
When must the station licensee make the station and its records availble for FCC inspection?
|
Any time upon request of an FCC representative
|
|
|
What may result when correspondence from the FCC is returned as undeliverable because the grantee failed to provided the correct mailing address?
|
Revocation of the station license or suspension of the operator license
|
|
|
What is the abbreviation that refers to radio frequency signals of alll types?
|
RF
|
|
|
What type of waves carries radio signals between transmitting and receiving stations?
|
electromagnetic waves
|
|
|
What are two components of radio waves?
|
electric and magnetic fields
|
|
|
How fast does a radio wave travel through free space?
|
speed of light, 300,000,000 meters per second' 300 million meters per second
|
|
|
What is the approximate velocity of a radio wave as it travels through free space?
|
300,000,000 meters per second - 300 million meters per second
|
|
|
What if the unit of frequency?
|
Hertz - Hz
|
|
|
If a frequency readout calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in Kilohertz?
|
Move the decimal 3 places to the right, 3525 kHz
|
|
|
What is the name of the distance a radio wave travels during one complete cycle?
|
wavelength
|
|
|
What property of radio waves is often used to identify the different frequency bands?
|
The approxiamate wavelength
|
|
|
How does the wavelenght of a radio wave relate to its frequeny?
|
The wavelenght gets shorter as the frequency increases
|
|
|
What is the formula for converting frequency to wavelength in meters?
|
Wavelength in meters = 300 divided by frequency in megahertz
|
|
|
What frequency range is referred to as HF (high frequency)?
|
3 to 30 mHz
|
|
|
Which frequncy is within the 6 meter band?
|
52.525 MHz
|
|
|
Which amateur band are you using when your station is transmitting on 146.52MHz?
|
2 meter band extends from 144MHz to 148MH
|
|
|
What it the wavelenght privileges on the 2 meter wavelenght band?
|
144MHz to 148MHz
|
|
|
What is the wavelenght privilage on the 6 meter wavelenght band?
|
50MHz to 54MHz
|
|
|
Which of the bands availble to Technician Class Operators have mode-restricted sub-bands?
|
6 meter, 2 meter, 1.25 meter bands
|
|
|
What emision mode are permitted in tghe mode-restricted sub-bands at 50.0 to 30.1MHz and 144.0 to 144.1MHz?
|
CW Only - Morse Code (continous wave)
|
|
|
What amateur band are you using if you are transmiting on 223.50MHz? 300/223.5
|
1.25 meter band....The 223MHz baqnd commonly called the 1.25 meters or 1 1/14 meter
|
|
|
Which emession mode may be used by a technican class operator between 219 and 220MHz?
|
Data
|
|
|
What aare the frequency limits of UHF spectrum?
|
300 MHz to 3000MHz
|
|
|
Which 70 cm freqency is authorized to a Technician Class License holder operating in ITU region 2?
|
443.350 MHz (r420 - 450 MHz)
|
|
|
What is the national calling frequency for FM simplex operations in the 70 cm band?
|
446.000MHz
|
|
|
What is the national calling simplex frequency for 2 meter band?
|
146.520MHz
|
|
|
Which 23 cm frequency is authorized to a Technician Class Operator license?
|
1296 MHz
|
|
|
What is the frequency band for 23-band cm?
|
1240 - 1300 MHz
|
|
|
What is a band plan, beyond the priviledges established by the FCC?
|
Voluntary guidelines for using different modes or activities within an amateur band.
|
|
|
What do the FCC rules mean when an amateur frequency band is said to be available on a secondary basis?
|
Amateurs may not cause harmful interferance to primary users
|
|
|
What must you do if you are operating on a 23 cm band and learn that you are interfering wiht a radiolocation station outside the US?
|
Stop operating or take steps to eliminate the harmful interference
|
|
|
What is a way to enable quick access to a favorite frequency on your transceiver?
|
Store the frequency in a memory channel
|
|
|
What is a disadvantage of the "rubber duck" antenna supplied with most handheld radio receivers?
|
It does not transmit or receive as effectively as a full-size antenna
|
|
|
What is a good reason not to use a "rubber duck" antenna inside your car?
|
signals can be significantly weaker than when it is ouside of the vehicle
|
|
|
What device increases the low-power output from a handheld transceiver?
|
an RF power amplifie
|
|
|
Which type of modulation is most commonly used for VHF and UHF voice repeaters?
|
FM
|
|
|
What is the approximate bandwith of a VHF repeater FM phone signal?
|
Between 5 and 15 kHz
|
|
|
What type of modulation is most commonly used for VHF packet radio transmision?
|
FM
|
|
|
What could be used in place of a regular speaker to help copy signals in a noisy area
|
a set of headphones
|
|
|
What is a good reason to use a regulated power supply for communication equipment?
|
to prevent voltage fluctuations from reaching sensative circuits
|
|
|
Which type of voice modulation is often used for long-distance or weak signal contacts on the VHF or UHF bands?
|
SSB - single sideband...good for bouncing signals off the ionosphere
|
|
|
What is the primary advantage of single sideband (SSB) over FM for voice transmisions?
|
SSB signals have narrower bandwidth
|
|
|
Which sideband is normally used for 10 meter HF,VHF, and UHF single-sideband communications?
|
Upper sideband
|
|
|
What devicee takes the output of a low-powered 28 MHz SSB exciter and produes a 222 MHz output signal?
|
transverter
|
|
|
What can be used to enter the operating frequency on a modern transceiver?
|
the keypad or VFO (variable frequency oscillator)
|
|
|
What is the purpose of the squelch control on a transceiver?
|
to mute receiver output noise when no signal is being received...silences background noice
|
|
|
What is used for the muting of receiver audio controlled soley by the presence or absence of an RF signal?
|
Carrier Squelch
|
|
|
Whatis the term used to describe an amateur station tht is transmitting and receiving on the same frequency?
|
simplex communication - simplex means same frequency
|
|
|
What must an amateur operator do when making on-air transmissions to test equipment or antennas?
|
Properly identify the transmitting station
|
|
|
What is the meaning of the procedural signal "CQ"?
|
calling any station
|
|
|
What should you transmit when responding to a call of CQ
|
The other station's call sign followed by your call sign
|
|
|
What is an appropriate way to call another station on a repeater if you know the other station's call sign
|
Say the station's call sign then identify with your call sign
|
|
|
What should you do if another operator reports that your station's 2 meter signals were strong just a moment ago, but now they are weak or disorted?
|
try moving a few feet, move to the right or lefft
|
|
|
What term is commonly used to describe the rapid fluttering sound sometimes heard from moble stations that are moving while transmitting?
|
picket fencing
|
|
|
What is the "Q" signal used to indicate you are receiving interference from other stations?
|
QRM
|
|
|
What is the "Q" signal used to indicate you are changing frequency?
|
QSY
|
|
|
What popular operating activity involves contractingn as many stations as possible during a specific period of time?
|
Contesting
|
|
|
What is a grid locator?
|
A letter-number designator assigned to a geographic location ...Grid squares are 2 letters by 2 numbers (1 degree latitude by 2 degree longitude
|
|
|
Why are UHF signals often more effective from inside buildings than VHF signals?
|
The shorter wavelength allows them to more easily penetrate the structures of buildings
|
|
|
What type of amateur station simultaneously retransmists the signal of another amateur station on a different channel or channels?
|
Repeater Stations
|
|
|
When is an amateur station authorized to automatically retransmit the radio signals of another amateur stations?
|
When signals are from an auxillary, repeatger, or space station
|
|
|
Describe the common meaning of the term "repeater offset?"
|
The difference between the repeater's transmit and the recevie frequencies
|
|
|
What is the most common repeater frequency offset in a 2 meter band?
|
plus or minus 600 kKhz
|
|
|
What is the term used to describe the use of a sub-audible tone transmitted with normal voice audio to open the squelch of a receiver?
|
CTCSS - Continous Tone Coded Squelch
|
|
|
What brief statement is often used in place of "CQ"" to indicate that you are listening on a repeater
|
Say your call sign
|
|
|
Which entities are recommens transmit/receive channels and other parameters for auxillary and repeater stations?
|
Frequency Coordinators
|
|
|
Who selects the frequency coordinators?
|
Amateur operators in a local or reginoal area whose stations are eligible to be auxillary or repeater stations.
|
|
|
Which stations transmits signals over the air fromm a remote recive site to a repeater for retransmission?
|
Auxillary Stations
|
|
|
What method of call sign identification is required for a a repeater station retranasmitting phone signals?
|
send the call sign using CW or phone emission
|
|
|
What is the common practice during net operations to get immediate attention of the net control station when reporting an emergency?
|
Begin your transmission wihth "Priority" or "Emergency" followed by your call sign
|
|
|
What is the Radio Amateur Civil Emergency Service (RACES)?
|
A radio service using amateur stations for emergency managementor civel defence communications
|
|
|
What is the preamble in a formal traffic message?
|
The information needed to track the message as it passes through the amateur radio traffic handling system
|
|
|
What is the usual name for the electromagnetic waves that travel through space?
|
Radio waves
|
|
|
What is the radio horizon?
|
The distance at which radio signals between two points are effectively blocked by the curvature of the earth
|
|
|
Why do VHFand UHF radio signals usually travel somewhat farther than the visual line of sight distance between two stations?
|
The earth seems less curved to radio waves than to light
|
|
|
What is meant by the term "knife-edge" propagation?
|
Signals are partially refracted around solid objects exhibiting sharp edges
|
|
|
What mode of is responsible for allowing over-the-horizon VHF and UHF communications to range aproximately 300 miles on a regular basis?
|
Tropospheric Scatter
|
|
|
What causes "tropospheric ducting?"
|
temperature inversions in the atmosphere
|
|
|
What is a characteristic of VHF signals received via auraal reflections?
|
The signals exhibit rapid fluctuations of strenght and often sound distorted
|
|
|
What band is best suited for communicating via metor scatter?
|
6 meter band
|
|
|
Which part of the atmosphere enables the propagationof radio signals around the world?
|
The ionsphere
|
|
|
What might be happening when VHF signals are being received from long distances?
|
Signals are being refracted from a sporadic-E layer (Refractions)
|
|
|
What is generally the best time for long-distance 10 meter band propagation?
|
During daylight
|
|
|
Which of the following is a comon effect of the "skip" reflections between the earth and the ionosphere?
|
The polarization of the orginal signal is radomized
|
|
|
Name the type of propagaton most commonly associated with occasional strong over-the-horizon signals on the 10,6, and 2 meter bands"
|
Sporaadic E Sporadic E skip
|
|
|
Why are "direct" (not via a repeater) UHF signals rarely heard from stations ouside your local coverage area?
|
UHF signals are usually not reflected by the ionosphere
|
|
|
What is the cause of irregular fading of signals from distant stations during times of generally good reception,?
|
Random combination of signals arriving via different path lengths
|
|
|
What is the FCC Part 97 definition of a space station?
|
An amateur station located more than 50km above the earth's surface
|
|
|
What do the in\tials LEO tell you about an amateur satillite?
|
Low Earth Orbits
|
|
|
What causes "spin fading" when referring to satellite signals?
|
The rotation f the satellite anditsw antennas
|
|
|
What is a satellite beacon?
|
A transmission from a space station that contains information about the satellite
|
|
|
With regard to satellite communicatio, what is Doppler Shift?
|
An observed change in signal frequency caused by relative motion between the satellite and the earth station
|
|
|
What is meant by the statement that a satellite is operating in the "mode U/V"?
|
The satellite uplink band is in the 70 cm band (U band) and the downlink is in the 2 meter (V) band
|
|
|
What is the FCC part 97 definition of telemetry?
|
A one way transmission of measurements at a distance from the measuring instrument
|
|
|
What is the FCC part 97 definition of telocommand?
|
A one-way transmission to initiate, modify, or terminate functions of a device many miles away
|
|
|
What code is used when sending CW in the amateur bands?
|
International Morse Code
|
|
|
Which of the following can be used to transmit CW in the amateur bands.
|
Straight key, electronic keys, computer keys
|
|
|
In a packet radio station, what is the connection between a transceiver and the computer?
|
Terminal node controller
|
|
|
How is the compiter's sound card used when conducting digtal communications using a computer?
|
The sound card proves audio to the microphone input and converts received audio to digital
|
|
|
What is a "parity" bit?
|
An extra code element used to detect errows in received data
|
|
|
What does the acronym "BER" mean when applied to digital communication systems?
|
Bit Error Rate
|
|
|
What may occur if VHF or UHF data signals propagate over multiple paths?
|
Error rates are liked to increase
|
|
|
What is a commonly used method of sending signals to and from a digital satellite?
|
FM packet
|
|
|
What does the term APRS mean?
|
Automatic Positon Reporting Systems
|
|
|
Which of the following is normally used when sending automatic location reports via amateur radio?
|
A Global Positioning System receiver
|
|
|
What does the abbreviation PKS mean?
|
Phased Shft Keying
|
|
|
What is PSK31?
|
A low-rate data transmission mode
|
|
|
What name is given to an amateur radio station that is used to connect other amateur stations to the internet?
|
Gateway
|
|
|
How would one select a specific IRLP node when using a portable transceiver?
|
Use the keypad to transmit the IRLP node ID
|
|
|
What is required in place of on-air station identification when sending signals to a radio control model using amateur frequencies?
|
A
A label indicating the licencee's name, call signal and address must be affixed to the transmitter |
|
|
What is the maximum power allowed when transmitting telecommand signals to radio controlled models?
|
1 watt
|
|
|
What type of transmission is indicated by the term NTSC?
|
An analog fasr scan color TV signal
|
|
|
How might you obtain a list of active nodes that use VolP?
|
From a repeater directory
|
|
|
Which of the following devices is most useful for VHF weak-signal communications?
a quarter-wave vertical antenna a multi-mode VHF transceiver an omni-directional antenna a mobile VHF FM transceiver |
A multi-mode VHF transceiver
|
|
|
Which of the following types of emission has the narrowest bandwidth?
FM voice SSB voice CW slow-scan TV |
CW, Morse code
|
|
|
What is the approximate bandwidth required to transmit a CW signal?
2.4 kHz 150 Hz 1000 Hz 15 kHz |
150 Hz
|
|
|
Which of the following is an appropriate receive filter to select order to minimize noise and interference for CW reception?
500 Hz 1000 Hz 2400 Hz 5000 Hz |
500 Hz
|
|
|
Which of the following is a form of amplitude modulation?
Spread-spectrum Packet radio Single sideband Phase shift keying |
Single sideband (SSB)
|
|
|
What is the approximate bandwidth of a single sideband voice signal?
1 kHz 3 kHz 6 kHz 15 kHz |
3 kHz of bandwidth
|
|
|
Which of the following circuits combines a speech signal and an RF carriers?
Beat frequency oscillator discriminiator Modulation Noise blanket |
Modulation
|
|
|
What is the function of a mixer in a superheterodyne receiver?
To rejection signals outside of the desired passband To shift the incoming signal to an intermediate frequency. To connect the receiver with an auxiliary device, such as a TNC |
To shift the incoming signal to an intermediate frequency
|
|
|
What is the advantage of having multiple receive bandwidth choices on a multimode transceiver?
Permits monitoring several modes at once Permits noise or interference reduction by selecting a bandwidth matching the mode Increases the amount of offset between receive and transmit frequency |
Permit noise or interference reduction by selecting a bandwidth matching the mode
|
|
|
Which of the following is an appropriate receive filter to select in order to minimize noise and interference for SSB reception?
500 Hz 1000 Hz 2400 Hz 5000 Hz |
2400 Hz, single sideband bandwidth is about 2500 Hz
|
|
|
Which of the following controls could be could be used if the voice pitch of a single-sideband signal seems too high or low?
The AGC or limiter The bandwidth selection The tone squelch The receiver RIT or clarifier |
The receiver RIT or clarifier
|
|
|
What does the term "RIT" mean?
Receiver Input Tone Receiver incremental Tuning Rectifier Inverter Test Remote Input Transmitter |
Receiver Incremental Tuning Control
|
|
|
Where is an RF preamplifier installed?
Between the antenna and receiver At the output of the transmitter's power amplifier Between a transmitter and antenna tuner At the receiver's audio output |
Between the antenna and the receiver
|
|
|
What is meant by fundamental overland in reference to a receive?
Too much voltage from the power supply Too much current from the power supply Interference caused by very strong signals Interference caused by tuning the volume up too high |
Interference caused by very strong signals
|
|
|
Which term describes the ability of a receiver to discriminate between multiple signals?
Tuning rate Sensitivity Selectivity Noise floor |
Selectivity
|
|
|
What determines the amount of deviation of an FM signal?
Both the frequency and amplitude of the modulating signal The frequency of the modulating signal The amplitude of the modulating signal The relative phase of the modulating signal and the carrier |
The amplitude of the modulating signal
|
|
|
What happens when the deviation of an FM transmitter is increased?
Its signal occupies more bandwidth Its output power increases Its output power and bandwidth increases Asymmetric modulation occcurs |
Its signal occupies more bandwidth
|
|
|
Which of the following circuits demodulates FM signals?
Limiter Discriminator Product detector Phase Inverter |
Discriminator
|
|
|
What is the typical bandwidth of analogy fast-scan TV transmissions on the 70 cm band?
more than 10 MHz about 6MHz about 3 MHz about 1 MHz |
6 MHz
|
|
|
What may happen if a transmitter is operated with the microphone gain set too high?
The output power might be too high. The output signal might become distorted. The frequency might vary. The SWR might increase |
The signal might become distorted
|
|
|
What can you do if you are told your FM handheld or mobile transceiver is over deviating?
Talk louder into the microphone Left the transceiver cool off. Change to a higher power level. Talk farther away from the microphone |
talk farther away from the microphone
|
|
|
What should you do if you receive a report that your station's transmissions are causing splatter or interference on nearby frequencies?
Increase transmit power Change mode of transmission Report the interference to the equipment manufacturer Check your transmitter for off-frequency operation or spurious emissions |
Check your transmitter for off-frequency operation or spurious emissions
|
|
|
Which of the following would reduce ignition interference to a receiver?
Change the frequency slightly. Decrease the squelch setting. Turn on the noise blanket Use the RIT control. |
Turn on the noise blanket
|
|
|
What could be happening if another operator reports a variable high pitched whine on the audio from your mobile transmitter?
Your microphone is picking up noise from an open window. You have the volume on your receiver set too high. Noise on the vehicles' electrical system is being transmitted along with your speech audio. You need to adjust your squelch control |
Noise on the vehicles' electrical system is being transmitted along with your speech audio.
|
|
|
What is the source of a high-pitched whine that varies with engine speed in a mobile transceiver's receive audio?
The ignition system The alternator The electric fuel pump Anti-lock brake system controls |
The alternator
|
|
|
Which would you use to reduce the RF current flowing on the shield of an audio cable?
Band-pass filter Low-pass filter Preamplifier Ferrite choke |
Ferrite choke
|
|
|
What type of filter should be connected to a TV receiver as the first step in trying to prevent RF overload from a nearby 2 meter transmitter?
low-pass filter high-pass filter Band-pass filter Band-reject filter |
Band-reject filter
|
|
|
Where must a filter be installed to reduce harmonic emissions?
Between the transmitter and the antenna Between the receiver and he transmitter. At the station power supply At the microphone |
Between the transmitter and the antenna
|
|
|
Which of the following may be a cause of radio frequency interference?
Fundamental overload Harmonics Spurious emissions All of the above are correct choices |
All of the above choices
|
|
|
What is a symptom of RF feedback in a transmitter or transceiver?
Excessive SWR at the antenna connection. The transmitter will not stay on the designated frequency. Reports of garbled, distorted, or unintelligible transmissions. Frequency blowing of power supply fuses |
Reports of garbled, distorted, or unintelligible transmissions.
|
|
|
What is the most likely cause of interference to a non-cordless telephone from a nearby transmitter?
Harmonics from the transmitter The telephone is inadvertently acting as a radio receiver. Poor station grounding. Improper transmitter adjustment. |
The telephone is inadvertently acting as a radio receiver
|
|
|
What is a logical first step when attempting to cure a radio frequency interference problem in a nearby telephone?
Install a low-pass filter at the transmitter. Install a high-pass filter at the transmitter. install an RF filter at the telephone. Improve the station grounding. |
install an RF filter at the telephone.
|
|
|
What is the electrical term for the electromotive force (EMF) that causes electrons flow?
voltage ampere-hours capacitance Induction |
voltage
|
|
|
What is the basic unit of electromotive (EMF) force?
the volt the watt the ampere the ohm |
The volt
|
|
|
Which instrument would you use to measure electric potential or electromotive force?
ammeter voltmeter wavemeter ohmmeter |
voltmeter
|
|
|
What is the correct way to connect a volmeter to a circut?
In series with the circuit In parallel with the circuit In quadrature wit the circuit. In phase with the circuit |
In parallel with the circuit
|
|
|
What is the nominal voltage of a fully charged nickel-cadmium cell?
1.0 volts 1.2 volts 1.5 volts 2.2 volts |
1.2 volts
|
|
|
Which battery type is not rechargeable?
Nickel-cadmium Carbon-zinc lead-acid lithium-io |
Carbon-zinc
|
|
|
How many volts does a mobile transceiver usually require?
about 12 volts about 30 volts about 120 volts about 240 volts |
about 12 volts
|
|
|
Where should a mobile transceiver's power negative connection be made?
At the battery or engine block ground strap. At the antenna mount. To any metal part of the vehicle. Through the transceiver's mounting bracket |
At the battery or engine block ground strap.
|
|
|
What is the name for the flow of electrons in an electric circuit?
Voltage Resistance Capacitance Current |
Current
|
|
|
Which instrument is used to measure electric current?
ohmmeter wavemeter voltmeter ammeter |
ammeter
|
|
|
How is an ammeter usually connected to a circuit?
In series with the circuit In parallel with the circuit In quadrature with the circuit In phase with the circuit. |
In series with the circuit
|
|
|
Electric current is measured in which of the following units?
volts watts ohms ampere |
Amperes
|
|
|
Which of the following is a good electrical conductor?
glass wood cooper rubber |
copper
|
|
|
What is the name for a current that reverses direction on a regular basis?
alternating current direct current circular current vertical current |
alternating current
|
|
|
What term describes the number of times per second that an alternating current reverses direction?
Pulse rate Speed Wavelength Frequency |
Frequency
|
|
|
Which of the following devices or circuits changes an alternating current into a varying direct current signal?
Transformer Rectifier Amplifier Reflector |
Rectifier
|
|
|
What is the name of a current that flows only in one direction?
alternating current direct current normal current smooth current |
direct current
|
|
|
What electronic component allow current to flow in only one direction?
Resistor Fuse Diode Driven Element |
Diode
|
|
|
What are the names of the two electrodes of a diode?
pulse and minus source and drain anode and cathode gates and base |
anode and cathode
|
|
|
How is a semiconductor cathode lead usually identified?
With a word "cathode" with a stripe With the letter "C" All of the above are correct |
with a stripe
|
|
|
What electrical component is used opposite the flow of current in a DC circuit?
Inductor Resistor Voltmeter Transformer |
Resistor
|
|
|
What instrument is used to measure resistance?
an oscilloscope A spectrum analyzer A noise bridge An ohmmeter |
an ohmmeter
|
|
|
What type of component is often used as an adjustable volume control"
Fixed resistor Power resistor Potentiometer Transformer |
A poteniometer
|
|
|
What electrical parameter is controlled by a poteniometer?
induction Resistance Capacitance Field strength |
Resistance
|
|
|
Which of the following is a good electrical insulator?
Cooper glass aluminum Mercury |
glass
|
|
|
What type of electrical component stores energy in a magnetic field"
Resistor Capacitor Inductor Diode |
Inductor
|
|
|
What electrical component is usually composed of a coil of wire?
Switch Capacitor Diode Inductor |
Inductor
|
|
|
What is the ability to store energy in a magnetic field called?
Admittance Capacitance Resistance Inductance |
Inductance
|
|
|
What is the basic unit of inductance?
The Coulomb The Farad The Henry The Ohm |
The Henry
|
|
|
What is the ability to store energy in an electric field called?
Inductance Resistance Tolerance Capacitance |
Capacitance
|
|
|
What is the basic unit of Capacitance?
The farad The ohm The Volt The Henry |
The farad
|
|
|
What electric component stores energy in an electric field?
Resistor Capacitor Inductor Diode |
Capacitor
|
|
|
What type of electric component consists of two or more conductive surfaces separated by an insulator?
Resistor Potentiometer Oscillator Capacitor |
Capacitor
|
|
|
What is the basic unit of inductance?
The Coulomb The Farad The Henry The Ohm |
The Henry
|
|
|
What is the ability to store energy in an electric field called?
Inductance Resistance Tolerance Capacitance |
Capacitance
|
|
|
What is the basic unit of Capacitance?
The farad The ohm The Volt The Henry |
The farad
|
|
|
What electric component stores energy in an electric field?
Resistor Capacitor Inductor Diode |
Capacitor
|
|
|
What type of electric component consists of two or more conductive surfaces separated by an insulator?
Resistor Potentiometer Oscillator Capacitor |
Capacitor
|
|
|
What electrical component is used to connect or disconnect electric circuits?
Zener diode Switch Inductor Variable resistor |
Switch
|
|
|
What electrical component is used to protec other circuits components from current oveloads?
fuse capacitor shield inductor |
fuse
|
|
|
Which of these components can be used as an electric switch or amplifier?
oscillator potentiometer transistor voltmeter |
transistor
|
|
|
What calss of electronic components is capable of using a voltage or current signal to control current flow?
Capacitors Inductors Resistors Transistors |
transistors
|
|
|
Which of the following electronic components can amplify signals?
Transistors variable resistors electrolytic capacitors multi-cell battery |
transistors
|
|
|
What is the term that describes a transistor's ability to amplify a signal?
Gain Forward resistance Forward voltage drop On resistance |
Gain
|
|
|
Which semiconductor component has an emiter electrode?
Bipolar transistor Field effec transistor Silicon diode Bridge rectifier |
Bipolar transistor
|
|
|
What does the abbreviation "FET" stand for?
Field Effect Transistor Fast Effect Transisttor Free electron Transistion Field Emission Thickness |
Field Effect Transistor
|
|
|
Which semiconductor component has a gate electrode?
Bipolar transistor Field Effect Tansistor Silicon diode Bridge rectifier |
Field Effect Transistor
|
|
|
Which term describes the rate at which electrical energy is used?
Reistance Current Power Voltage |
Power
|
|
|
Electric power is measured in which of the following units?
volts watts ohms amperes |
watts
|
|
|
What is the formula used to calculate electric power in a DC circuit?
P = E(volts) times I(current) P = E(volts)divided by I(currents) P = E(volts)minus I(current) P = E(volts)plus I(currents) |
Power = I times E
|
|
|
What formulat is used to calculate the voltage in a circuit?
Voltage (E)= current(I) times Resistance(R) Voltage(E) = current(I) divided by resistance (R) Voltage(E) =current(I)plus resistance (R) Voltage(E) = current(I) minus resistance (R) |
Voltage(E) = current (I) times Resistance (R)
|
|
|
What is the name for standarized representations of components in an electrical wiring diagram?
Electdrical depictions Grey sketch Schematic symbols Comonent callouts |
schematic symbols
|
|
|
Which of the following is accurately represened in electrical circuits?
the wires lengths the physical appearance of components the way components are interconnected all of the above |
the way the components are interconnected
|
|
|
Which of the following is used to together with an inductor to make a tuned circuit?
reisistor Zener diode Poteniometer Capacitor |
Capacitor
|
|
|
What is the best way to describe a relay?
A switch controlled by an electromagnet A current controlled amplifier A pass transitor An optical transistor |
A switch controlled by an electromagnete
|
|
|
What is the approxiamete amount of charge, measured in decibles of a power increase from 5 watt to 10 watt?
2 dB 3dB 5dB 10 dB |
3 dB
|
|
|
What type of circuit controls the amount of voltage from a power supply?
Regulator Oscillator Filter Phase Inverter |
Regulator
|
|
|
What component is commonly u8sed to charge 120 AC house current to a lowe voltage for other uses?
variable capacitor transformer transister Diode |
Transformer
|
|
|
What is the name of a device that combines several semicondoctors and other components into one package?
transducer Multi-pole relay Integrated circuit Transformer |
Interaged circuit
|
|
|
What does the term 'LED" stand for?
Low Emission diode Light Emitting Diode Liquid Emission Detector Long Echo Delay |
Light Emitting Diode
|
|
|
Which of the following is commonly used as a visual indicator?
LED FET Zener diode Bipolar transistor |
LED
|
|
|
What is another way to specify a radio signal frequency of 1,500,000 hetz?
1500 kHz 1500MHz 15 GHz 150 KHz |
1500 kHz
|
|
|
How many volts are equal to one Kilovolts?
one one-thousandth of a volt one hundred volts one thousand volts one million volts |
one thousand volts
|
|
|
Which of the followig types of older is best for radio and electronic use?
Acid-core solder Siver solder Rosin-core solder Aluminum solder |
rosin-core solder
|
|
|
What is characteristic appearance of a "cold" soder joint?
Dark balck spots A bright or shiy surface A grainy or full surface A green tint |
grainy or dull surface
|
|
|
Which of the following measurements are commonly made using a multimeter?
SWR and RF Power Signal strength and noise Impedance and reactance voltage and resistance |
voltage and resistance
|
|
|
Which of the following precautions should be taken when measuring circits resistance with an ommeter?
Ensure that the applied voltage are correct. Ensure that the circuit is not powered. Enssusre that the circuit is grounded? Ensure that the circuit is operating at the correct frequency |
Ensure tht the circuit is NOT powered
|
|
|
Which of the following might damage a multimeter?
Measureing a voltage too small for th echosen scale. Leaving the meter in the millliamps position overnight. Attempting to measure voltage when the using the resistance setting Not allowing it to warm up properly. |
Attempting to measure voltage when using the resistance setting
|
|
|
What is probably happening when an ohmeer,connected across a circuit, intially indicates a low resistance and then shows increasing resistance with time?
the ohmeeter is defective The circuit contains a large capacitor The circuit contains a large inductor. The circuit is a relaxation oscillator. |
The circuit contais a large capacitor
|
|
|
Which of the following describes a simple diple mounted so that the conductor is parallel to the earth's surface?
a ground wave antenna A horizontally polorizes antenna A rhombic antenna A vertically polorized antenna |
A horizontally polorized antenna
|
|
|
In which direction is the radiation strongest from a half-wave dipole antenna in free space?
Equally in all directions Off the ends of the antenna. Broadside of the antenna. In the direction of the feed line. |
Broadside of the antenna
|
|
|
What is the approximate length, in inches of a 6 meter 1/2 wavelenth wire dipole antenna?
6 50 112 236 |
112.3
|
|
|
How would you change a dipole antenna to make it reasonat on a higher frequency?
Lengthen it insert coils in series with radiating wires shorten it Add capacity hats to the ends of the radiating wires |
shorten it
|
|
|
Which of the following is true regarding vertical antennas?
The magnetic field is perpendicular to the earth The electric field is perpendicular to the earth The phase is inverted The phase is reversed. |
The electric field is perpendicular to the arth
|
|
|
What is the approxiamate length, in inches, of a quarter-wavelenght vertical antenna for 146 MHz?
112 50 19 12 |
19
|
|
|
What type of antennas are the quad, Yagi an dish?
Non-resonat antennaes Loop antennas directional antennas isotropic antennae |
directional antennaes
|
|
|
What is a beam antenna?
An antenna builf from aluminin I beams. An omnidirectional antenna inverted by Clarence Beams An antennat that concentrates signals in one direction. An antenna that reverses the phase of receiving signals |
An atennae that concentrates signals in one direction
|
|
|
Which of the following method is used to locate the sources of noise interference or jamming?
Echolocator Doppler Radar Radio direction finding phase locking |
radio directing finding
|
|
|
Which of the following would be useful for a hidden transmission hunt?
calibrated SWR meter directional antenna A calibrated noise bridge All of the above |
a directional antenna
|
|
|
When using a directional antenna, how migh your station be able to acess a distant repeater if buildings or obstructions are blocking the direct line of sight path.
Change from vertical to horizontal polarization try to find a path that reflects signals to the repeater Try the long path increase the antenna SWR |
try to find a path that reflects signals to the repeate
|
|
|
What is meant by gain on an antennae?
The addition of pwer that is added to the transmitter power. Teh addition of power that is lost in the antenna when transmitting on a higher frequency The increase i signal strength in a specific direction when compared to a reference antenna. The increase in impedance on receive or transmit compared to a reference antenna |
The increase in signal strength in a specific direction when compared to a reference antenna
|
|
|
What antenna polorization is normally used or long-distance weak-signal CW Aand SSB contacts using the VHF and UHF bands?
right-hand circular left-hand circular vertical horizontal |
horizontal
|
|
|
What can happen if the antennas at opposite ends of a VHF or UHF line of sigt radio link are not using the same polarization?
the modulation sidebands might become inverted. Signals could be significantly weaker Signals have an echo effec on voices Nothing significanant will happen |
Signals wold be significantly weake
|
|
|
Which of the following is a common use of coaxil cables?
carry DC power from a vehicle battery to a mobile radio. Carry RF signals between a radi and antenna Secure masts, tubing, and other cylinderal objects on towers. connect data signals from a TNC to a computer |
carry RF signals between a radio and antenna
|
|
|
Why is coaxial cable used more often than any other feed line for amatuer radi antenna systems?
It easy to use and requires few specific installation considerations It has less loss than any other type of feed It can handel more power than any other type of feed line It is less expensive than oter types of feed lines |
It easy to use and requires few specific installation considerations
|
|
|
What is the impedence of the most commonly used coaxal cable in typical amateur radio installations?
8 ohms 50 ohns 600ohms 12 ohms |
50 ohms
|
|
|
What generally happpens as the frequency of a signal passing through coaxial cable is increased?
The apparent SWR increases The reflected power increases The characteristic impedance increases. The loss increases. |
The loss increases
|
|
|
Which of the following is true of PL-259 type coax connectors?
They are good for UHF frequencies The are water tight They are commonly usef at HF frequencies They are a bayonet type of connector |
They are commonly used at HF frequencies
|
|
|
What is a disadvantage of "air core" coaxia cable when compared to foam or solid dielectric types?
It has more loss per foot It cannot be used for VHF or UHF antennas It requires special techniques to prevent water absorption It cannnot be used below freezing temperature. |
It requires special techniques to prevent water absorption
|
|
|
Which is of the following is the most common cause for failure of coaxail cables?
Moisture contamination Gamma rays The velocity factor exceeds1.0 Overloading |
Moisture contamination
|
|
|
Why should coax connectors exposed to the weather be sealed aginst water intrusion?
To prevent an increase in feed line loss. To prevent interference to telephones To keep the jacket from becoming loose. All of the above |
To prevent an increase in feed line loss
|
|
|
Why should the outer jacket of coaxial cable be resistant to ultraviolet rays?UV rays resisant jackets prevent harmonic radiation.
UV light can increase losses in the cable's jacket UV and RF signals can mix togethe, causing interference UV light can damage the jacket and allow water to enter the cable. |
UV light can damage the jacket and allow water to enter the cable.
|
|
|
What electrical difference exists between the smaller RG 58 and the larger RG8 coaxial cables?
There is no significant difference RG 58 cable has less loss at a given frequency RG 8 cable has less loss at a given frequency RG 58 cable can handle higher power levels |
Rg-8 cables has less loss at a given frequency
|
|
|
Which of the following types of feed lines has the lowest loss of VHF and UHF?
50 ohm flexible coax multi-conductor unbalanced cable. air-insulated hard line 75 ohm flexible coax |
air-insulated hard line
|
|
|
Which of the following instruments can be used to determine if an antenna is resonant at the desired operating frequency?
VYVM an antena analyzer A "Q" meter A frequency counter |
an antenna analyzer
|
|
|
What, in general terms, is standing wave ratio?
A measure of how well a load is matched to a feed line. The ratio of high to low impedance in a feed line. The transmitter effeciency ratio. An indicator of the quality of our station's ground connection. |
A measure of how well a load is matched to a feed line
|
|
|
Why is it important to have a low SWR in an antenna system that uses coaxial cable feed lines?
To reduce TV interference To allow the effect transfer of power and reduce losses To protect antenna life All of the above |
To allow the effcient transfer of power and reduce losses.
|
|
|
What reading of an SWR meter indicates a perfect impedance match between the antenna and the feed line?
2 to 1 1 to 3 1 to 1 10:1 |
1:1
|
|
|
What is the approximate SWR value above which the protection circuis in most solid-state transmitters begin to reduce transmission power?
2 to 1 1 to 2 6 to 1 10 to 1 |
2 to 1
|
|
|
What does an SWR reading of 4:1 mean?
An antenna loss 4 dB a good impedance match An antenna gain of 4 An impedance mismatch |
An impedance mismatch
|
|
|
What might cause erratic changes in SWR reading?
The transmitter is being modulated. A loose connection in an antenna or a feed line The transmitter is being over-modulated Interference from other stations is distorting your signa. |
A loose connection in an antenna or a feed line
|
|
|
What intrument other than an SWR meter could you use to determine if a feed line and antenne are properly matched?
Volmeter Ohmmeter lambic pentameter Directional wattmeter |
Directional wattmeter
|
|
|
What happens to power lost in a feed line?
It increases the SWR It comes back into your transmitter and could cause damage It is converted to heat it can cause distortion of your signal |
It is converted to heat
|
|
|
What does an antenna tuner do?
It matches the antenna system impedenace to the transceiver's output impedence It helpf a receiver automatically tune in weak stations. It allows an antenna tobe used on both transmit and receive It automatically selects the proper antenne fro the frequency band being used |
It matches the antenna system impedenace to the transceiver's output impedence
|
|
|
What is the primary purpose of a dummy load?
To prevent the radiation of signals when making tests To prevent over-modulation from your transmitter To improve the radiation from your antenna To improve the signal to noise ratio of your receive |
To prevent the radiation of signals when making test
|
|
|
What is connected to the green wire in a three-wire electrical AC plug?
Neutral hot safety ground the white wire |
Safetly ground - green for ground
|
|
|
What is the purpose of a fuse in an electrical circuit?
To prevent power supply from damaging a circuit To interrupt power in case of overload to limit current to prevent shock All of the above |
To interrupt power in case of overload
|
|
|
Why is it unwise to install a 20 ampree fuse in the place of a 5 ampere fuse?
The larger fuse would likely to blow because it is rated for higher curent. The power supply ripple would greatly increase. Excess current could cause a fire. All of the above |
Excess power could cause a fire
|
|
|
What kind of hazard might exist in a power supply when it is turned off and disconnected?
Static electricity could damage the grounding system. Circulating currents inside the transformer might cause damage. The fuse might blow if you remove the cover. You might receive an electric shock from the stored charge in large capacitors. |
You might receive an electric shock from the stored charge in large capacitors.
|
|
|
Which is acommonly accepted value for the lowest voltage tht can cause a dangerous electric shock?
12 volts 30 volts 120 volts 300 volts |
30 volts
|
|
|
How does current flowing through the body cause a health hazard?
By heating tissue It disrupts the electrical functions of cells It causes involuntary muscle contractions All of the above |
All of the above
|
|
|
Which is one way to recharge a 12 volt lead-acid station battery if your commericial power id out?
cool the battery in ice for several hours. Add acid to the battery. Connect the battery to a car's battery and run the engine all of the above |
connect the battery to a car's battery and rund the engine.
|
|
|
What can happen if a lead-acid storage battery is charged ordischarged too quickly?
The battery could overheat and give off flammable gas or explode The voltage can become reversed The "memory effect" wil reduce the capacity of the battery. All of the above |
The battery could overheat and give off flammable gas or explode
|
|
|
What kind of hazard is presented by a commercial 12 volt storage battery?
It emits ozone whhc can be harmful to the environment. Shock hazard due to high voltage. Explosive gas can connect if not properly vented all of the above |
Explosive gas can connect if not properly vented
|
|
|
Which of the following is an important safety precausion to observe when puttig up an antena tower?
Wear a ground strap at all times. Insulate the base of the tower to avoid lighting strikes, Look for and stay clear of any overhead electrical wire. All of the above |
Look for and stay clear of any overhead electrical wires
|
|
|
What is the minimum safe distance from a powe line to allow when installing an antenna?
half the width of your property The height of the power line above ground 1/2 wavelength at the operating frequency So that if the antenne falls unexpectedly, no part of it can come closer than 10 feet to the power wires. |
So that if the antenne falls unexpectedly, no part of it can come closer than 10 feet to the power wires.
|
|
|
Which of the following establishes groundng reqirements for an amateur radio tower or antenna?
FCC Part 97 rules Local electrical codes FAA tower lighting regulations Underwriters Laboratories recommendations |
Local electrical codes
|
|
|
What is considered to be a prope grounding method for a tower?
A single four-foot ground rod, driven into the ground no more than 12 inches from the base. A ferrite-ccore RF choke connected between the tower and the ground. Separate eight foot long ground rods for each tower leg, bonded to the tower and each other. a connection between the tower base and a cold wate pipe. |
Separate eight foot long ground rods for each tower leg, bonded to the tower and each other.
|
|
|
Which type of conductor is best used for RF grounding?
round stranded wire Round copper clad steel wire twisted pair cables flat strap |
flat strap - cooper foi ribbon (flat)
|
|
|
Which of the following is good practice when installing ground wires ona tower for lightning protection?
Make sure all bends in the ground wire are clean, right angle bends Put a loop in the ground connection to prevent wate damage to the ground system Ensure that the connections are short and direct. all of the above |
Ensure that the connections are short and direct.
|
|
|
Which of the following is true concerning grounding conductors used for lightnng protection?
only non-insulated wire must be used. Wires must be carefully routed with precise righ-angle bends. sharp bends must be avoided common grounds must be avoided |
sharp bends must be avoided
|
|
|
Which of the following precautions should be takenwhen intalling devices for lightning protection in a coaxial cable feed line?
ground all the protectors to a common plate which in turn is connected to an external ground |
ground all the protectors to a common plate which in turn is connected to an external ground
|
|
|
What is the purpose of a gin pole?
to temporarily replace the guy wires. To be used in place of a safety harness. to lift tower sections or antennnas to provide a temporary ground |
to lift tower sections or antennnas
|
|
|
What factors affect RF exposure of people near an amaetur station antenna?
Frequency and power level of the RF field Distance from the antenae to the person Radiation pattern of the antenna all of the above |
all the above
|
|
|
Why do exposure limiits vary with frequency?
lower frequency RF fields have more effect than higher frequency fields. Lower frequency RF fields do not penetrate the human body The human body absorbs more RF energy at some frequencies than at others |
The human body absorbs more RF energy at some frequencies than at others
|
|
|
Which of the following frequencies has the lowest maximum premissible exposure limit?
3.5 MHz 50 MHz 440 Mhz 1296 Mhz |
50 MHz
|
|
|
What is the maximumpower level that an amateur radio station mayuse at VHF frequncy before an RF expousure evaluvation is required
1500 watts PEP transmitter output 1 watt forward power 50 wat PEP at the antenna 50 wat PEP reflected power? |
50 wat PEP at the antenna
|
|
|
What type of radiatio are VHF and UHF radio signals?
Gamma radiation ionizing radiation Alpha radiation non-ionizing radioation |
non ionizing radiation
|
|
|
Which of the following is an acceptable method to determine tht your station complies with FCC RF exposure regulations?
By calculation based on FCC OET Bulletin 65 By calculations based on compter modeling. By measurements of field strenght using callibrated equipment all of the above |
all the above
|
|
|
Which of the of the following actions might amateur operators take to prevent exposure to RF radiation in excess of FCC-specified limits?
relocate the antennas relocate the transmitter increase the duty cycle all of the above |
relocate the antennas
|
|
|
How can you make sure your station stays in complance with RF saftey regulations?
by informing FCC of any changes in our station By re-evaluating the station whenever an item of equipment is changed all of the above |
By re-evaluating the station whenever an item of equipment is changed
|
|
|
What is meant by "duty cycle when refering to RF exposure?
The difference between lowest usable output and maximum rated output. The difference betewen PEP and average pwer on an SSB signal. The ratio of on-air time to total operating time of a transmitted signal The amount of time the operator spends transmitting |
The ratio of on-air time to total operating time of a transmitted signal
|
|
|
Why is duty cycle one of the factors used to determine safe RF radiation exposure?
It affects the average exposure of people to radiation. It affects the peak exposure of people to radiation. It takes into account the antennae feed line loss It takes into account the thermal effects of the final amplifier. |
It affects the average exposure of people to radiation
|
|
|
What could happen if a person accidentaly touched our antenna while you were transmitting?
touching the antenae interfers with the TV They might receive a painful RF burn. They might develop radiation poisoning. all of the above |
They might receive a painful RF burn.
|
