T7B Transmitter and receiver block diagrams;
purpose and operation of
low-pass,
high-pass and band-pass filters
T7B01
@T7A03
What
circuit uses a limiter and a frequency discriminator to produce
an
audio signal?
A. A double-conversion receiver
B. A variable-frequency oscillator
C. A superheterodyne receiver
D. An FM receiver
T7B02
@T7A04
What
circuit is pictured in Figure T7-1 if block 1 is a variable-
frequency
oscillator?
A. A packet-radio transmitter
B. A crystal-controlled transmitter
C. A single-sideband transmitter
D. A VFO-controlled transmitter
T7B03
@T7A05
What
circuit is pictured in Figure T7-1 if block 1 is a crystal
oscillator?
A. A crystal-controlled transmitter
B. A VFO-controlled transmitter
C. A single-sideband transmitter
D. A CW transceiver
T7B04
@T7A08
What
type of circuit does Figure T7-2 represent if block 1 is a
product
detector?
A. A simple phase modulation receiver
B. A simple FM receiver
C. A simple CW and SSB receiver
D. A double-conversion multiplier
T7B05
@T7A09
If
Figure T7-2 is a diagram of a simple single-sideband receiver, what
type of
circuit should be shown in block 1?
A. A high pass filter
B. A ratio detector
C. A low pass filter
D. A product detector
T7B06
@T7A10
What
circuit is pictured in Figure T7-3, if block 1 is a frequency
discriminator?
A. A double-conversion receiver
B. A variable-frequency oscillator
C. A superheterodyne receiver
D. An FM receiver
T7B07
@T7A16
Why do
modern HF transmitters have a built-in low-pass filter in their
RF
output circuits?
A. To reduce RF energy below a cutoff point
B. To reduce low-frequency interference to other
amateurs
C. To reduce harmonic radiation
D. To reduce fundamental radiation
T7B08
@T7A17
What
circuit blocks RF energy above and below certain limits?
A. A band-pass filter
B. A high-pass filter
C. An input filter
D. A low-pass filter
T7B09
@T7A18
What
type of filter is used in the IF section of receivers to block
energy
outside a certain frequency range?
A. A band-pass filter
B. A high-pass filter
C. An input filter
D. A low-pass filter
T7B10
@T7A19
What
circuit function is found in all types of receivers?
A. An audio filter
B. A beat-frequency oscillator
C. A detector
D. An RF amplifier
T7B11
@T7A20
What
would you use to connect a dual-band antenna to a mobile
transceiver
which has separate VHF and UHF outputs?
A. A dual-needle SWR meter
B. A full-duplex phone patch
C. Twin high-pass filters
D. A duplexer