WorksheetsHam radio
Total questions: 40
Worksheet time: 20mins
According to ITU Regulations, radiocommunications between amateur stations of two different countries is permitted:
Only when a reciprocal agreement permitting such transmissions is in place between the two countries
Unless the administration of one of the countries concerned has notified that it objects to such radiocommunications
If the two countries are members of the IARU
If the two countries are members of the ITU
A CEPT Class 1 amateur radio licence entitles the holder to:
Broadcast on the amateur radio frequency bands
Broadcast to the general public, subject to the frequency and power limits specified in the licence
Establish communications on amateur radio frequencies with other amateur radio stations
Establish communications with anyone on the amateur radio frequency bands
The authorised frequency range in the “40 metre band” is:
7.000 to 7.100 MHz
7.000 to 7.200 MHz
7.000 to 7.268 MHz
7.000 to 7.300 MHz
Which one of these frequencies is not on the list of frequencies which radio amateurs are authorised to use?
3.750 MHz
14.400 MHz
24.900 MHz
431 MHz
The maximum power permitted when operating MOBILE on 70.200 MHz is:
200W (23 dBW)
100W (20 dBW)
50W (17 dBW)
25W (14 dBW)
The station logbook must include:
Power level used
Details of the antenna used
Location of stations contacted
Signal reports sent and received
The call sign M/EI8XYZ would be used by:
An English visitor to Ireland who has been issued with a visitor’s call sign
The holder of EI8XYZ while on a visit to England
The holder of EI8XYZ while operating mobile in Ireland
The holder of EI8XYZ while operating mobile in Northern Ireland
Radio amateurs have a “Secondary” allocation in which one of these frequency ranges?
18.068 to 18.168 MHz
21.000 to 21.450 MHz
50.000 to 52.000 MHz
144.000 to 146.000 MHz
J3E is the ITU emission designation for:
Single sideband, suppressed carrier, speech
RTTY / AMTOR
CW (Morse)
Frequency modulation
In order to comply with the IARU Region 1 Band Plan, the lowest dial setting for LSB (voice) transmissions on the 1.8 MHz band should be:
1807 kHz
1837 kHz
1843 kHz
1903 kHz
Under the IARU Region 1 Band Plan, which
mode(s) may be used in the frequency range
14.000 – 14.060 MHz:
All modes
CW
CW and digimodes
SSB (however, no contests)
In the Q Code, QRZ? means:
Are you operating on low power?
Who is calling me?
Are my signals fading?
Can you change frequency?
The call sign of a radio amateur in Ukraine
might have the prefix:
UA
PA
UR
9A
Which of these complies with the ITU Radio
Regulations for a normal amateur radio call
sign?
EJ6
6EGJ
2E6J
2EJ6
A signal strength report of “33” would mean:
Unreadable, very weak signal
Strong signal, readable with no
difficulty
Perfectly readable, very strong signals
Readable with considerable difficulty,
weak signal strength
The IARU Region 1 Band Plan gives priority
for intercontinental operation in the segment:
3600 to 3625 kHz
3675 to 3700 kHz
3725 to 3750 kHz
3775 to 3800 kHz
The Morse Code message
“CQ CQ DE EI3XYZ K” indicates that:
EI3XYZ has put out a general call for
a contact
Someone is calling EI3XYZ
EI3XYZ is giving a signal report
EI3XYZ is making a test
transmission and should not be
answered
Under the IARU HF Band Plan, contests are
not permitted on which amateur band?
14 MHz
18 MHz
21 MHz
28 MHz
The call sign NK3GR in the phonetic
alphabet would be correctly spoken as:
November-Kilo-Three-Golf-Romeo
November-Kilowatt-Three-George-
Radio
Nancy-Kilowatt-Three-Golf-Romeo
November-Kilo-Three-George-
Romeo
The inclusion of a 1:1 balun between the
elements of a balanced antenna and the
coaxial feeder is often recommended in order
to:
Prevent the outer braid of the coaxial
feeder from radiating
Resonate the antenna
Improve impedance matching
Eliminate sub-harmonics of the
transmitted signal
Harmonics from a transmitter operating at
70 MHz are causing interference to a
television receiver tuned to 210 MHz. Which
component fitted to the transmitter’s antenna
lead is likely to be best suited to deal with
this problem?
An open-circuit coaxial stub (i.e.
open at the end) which is an electrical
quarter wavelength at 70 MHz
A closed-circuit coaxial stub (i.e.
shorted at the end) which is an
electrical quarter wavelength at
70 MHz
An open-circuit coaxial stub which is
an electrical quarter wavelength at
210 MHz
A closed-circuit coaxial stub which is
an electrical quarter wavelength at
210 MHz
Parasitic oscillations could be described as:
The principal cause of non-ionising
radiation
High powered harmonics
Additional or undesired oscillations
Interference due to antenna mismatches
The circuit diagram below shows a:
Wave trap
Low pass filter
High pass filter
Band stop filter
Intermodulation in a receiver is more likely to
be caused by:
The mixing of two or more
frequencies in some part of the
receiver circuitry
Lack of sensitivity
Absence of mains filtering
Excessively low SWR on the
antennal feed line
A band-pass filter:
Passes signals at all frequencies
Attenuates signals at all frequencies
Passes signals between two
frequencies
Increases the receiver bandwidth
A neighbour’s hi-fi system is suffering radio
frequency break-through. A remedy for this
might be to:
Place a capacitor in series with the
transmitter output
Put ferrite rings on the hi-fi system’s
loudspeaker cables
Place a ferrite ring on the transmitter
output cable
Use open wire feeder for the
transmitter
Selecting from the choices below, a mains
plug for a power supply which has a power
consumption of 500 watts should have a fuse
rated at ________ to provide the highest
possible level of protection:
[ ] 1 amp
[ ] 3 amps
[ ] 5 amps
13 amps
The smoothing capacitors in a High Voltage
supply for a valve power amplifier need:
Large value resistors to discharge the
capacitors when switched off
Forced air-cooling
A heat sink
RF decoupling
When installing a resonant half-wave dipole,
in order to keep high voltages away from
possible human contact which is the more
important consideration?
The location of the ends of the dipole
The location of the centre of the
dipole
The location of the low-pass filter
All are equally important; the
voltages are the same at all points
To ensure the level of non-ionising radiation
from an amateur radio station is within the
guideline limits, choosing from the options
below, the main focus would be on:
The design of the output stages of the
final amplifier
Filtering at the output stages
The design and location of the
antenna
Minimising parasitic oscillations
Which of the following sets of materials are
all electrical insulators?
Ceramic, Brass, Iron
Copper, Glass, Mica
Silver, Gold, Iron
Glass, Mica, Ceramic
The Q-factor of a resonant circuit refers to:
The resonant frequency
0.707 times the resonant frequency
The bandwidth relative to the
resonant frequency
The square root of the DC resistance
of the circuit
The current flowing through the 27 resistor
in the circuit below is:
27mA
33mA
60mA
100mA
A power supply could use a(n) _________
to provide a regulated output voltage:
Zener diode
Electrolytic capacitor
Mica capacitor
Quartz crystal
In the circuit below, the output waveform at
resistor R would look like:
Waveform A
Waveform B
Waveform C
Waveform D
Each of the capacitors in the circuit below
has a value of 5nF. What value would be
measured between points X and Y?
3.33nF
5nF
7.5nF
15nF
In an SSB receiver the frequencies of the CIO
(Carrier Insertion Oscillator) might be:
±1.5 kHz from the intermediate
frequency
Approximately 3 kHz and 6 kHz
Approximately 6 kHz and 10 kHz
455 kHz and 10.7 MHz
All other things being equal, SSB
transmissions:
Occupy about twice the bandwidth of
AM transmissions
Contain more information than AM
transmissions
Occupy the same bandwidth as CW
transmissions
Occupy about half the bandwidth of
AM transmissions
In the circuit below, ignoring component
losses:
Current at the resonant frequency and
below that frequency will be
unaffected
Current at the resonant frequency will
be impeded
Current at the resonant frequency will
readily pass through
Current at the resonant frequency and
above that frequency will be
unaffected
A low-pass filter includes an inductor with a
value of 3.4μH. Following some tests, it is
decided to increase the inductance to 5.1μH.
This can be achieved by:
Adding a 1.7μH inductor in parallel
with the existing inductor
Adding a 1.7μH inductor in series
with the existing inductor
Adding a 8.5μH inductor in parallel
with the existing inductor
Adding a 8.5μH inductor in series
with the existing inductor
