T4D RFI and its complications, resolution and
responsibility
T4D01
@N4D01
What is
meant by receiver overload?
A. Too much voltage from the power supply
B. Too much current from the power supply
C. Interference caused by strong signals from a
nearby source
D. Interference caused by turning the volume up
too high
T4D02
@N4D02
What is
meant by harmonic radiation?
A. Unwanted signals at frequencies that are
multiples of the
fundamental
(chosen) frequency
B. Unwanted signals that are combined with a
60-Hz hum
C. Unwanted signals caused by sympathetic
vibrations from a nearby
transmitter
D. Signals that cause skip propagation to occur
T4D03
@N4D06
What
type of filter might be connected to an amateur HF transmitter to
cut
down on harmonic radiation?
A. A key-click filter
B. A low-pass filter
C. A high-pass filter
D. A CW filter
T4D04
@N4D08
If your
neighbor reports television interference whenever you are
transmitting
from your amateur station, no matter what frequency band
you
use, what is probably the cause of the interference?
A. Too little transmitter harmonic suppression
B. Receiver VR tube discharge
C. Receiver overload
D. Incorrect antenna length
T4D05
@N4D09
If your
neighbor reports television interference on one or two
channels
only when you are transmitting on the 15-meter band, what is
probably
the cause of the interference?
A. Too much low-pass filtering on the
transmitter
B. De-ionization of the ionosphere near your
neighbor's TV antenna
C. TV receiver front-end overload
D. Harmonic radiation from your transmitter
T4D06
@N4D10
What
type of filter should be connected to a TV receiver as the first
step in
trying to prevent RF overload from an amateur HF station
transmission?
A. Low-pass
B. High-pass
C. Band pass
D. Notch
T4D07
@N4D11
What
first step should be taken at a cable TV receiver when trying to
prevent
RF overload from an amateur HF station transmission?
A. Install a low-pass filter in the cable
system transmission line
B. Tighten all connectors and inspect the cable
system transmission
line
C. Make sure the center conductor of the cable
system transmission
line is
well grounded
D. Install a ceramic filter in the cable system
transmission line
T4D08
@N4D12
What
effect might a break in a cable television transmission line have
on
amateur communications?
A. Cable lines are shielded and a break cannot
affect amateur
communications
B. Harmonic radiation from the TV receiver may
cause the amateur
transmitter
to transmit off-frequency
C. TV interference may result when the amateur
station is
transmitting,
or interference may occur to the amateur receiver
D. The broken cable may pick up very high
voltages when the amateur
station
is transmitting
T4D09
@N4D13
If you
are told that your amateur station is causing television
interference,
what should you do?
A. First make sure that your station is
operating properly, and that
it does
not cause interference to your own television
B. Immediately turn off your transmitter and
contact the nearest FCC
office
for assistance
C. Connect a high-pass filter to the
transmitter output and a low-
pass
filter to the antenna-input terminals of the television
D. Continue operating normally, because you
have no reason to worry
about
the interference
T4D10
@N4D14
If
harmonic radiation from your transmitter is causing interference to
television
receivers in your neighborhood, who is responsible for
taking
care of the interference?
A. The owners of the television receivers are
responsible
B. Both you and the owners of the television
receivers share the
responsibility
C. You alone are responsible, since your
transmitter is causing the
problem
D. The FCC must decide if you or the owners of
the television
receivers
are responsible
T4D11
@N4D15
If
signals from your transmitter are causing front-end overload in
your
neighbor's television receiver, who is responsible for taking
care of
the interference?
A. You alone are responsible, since your
transmitter is causing the
problem
B. Both you and the owner of the television
receiver share the
responsibility
C. The FCC must decide if you or the owner of
the television receiver
are
responsible
D. The owner of the television receiver is
responsible