WEEK 13 ATT ET TEST WITH
QUESTIONS AND ANSWERS| VERIFIED
BY EXPERT| 2025 NEW UPDATE.
Heterodying - ANSWER ✔✔ Converts a signal from one frequency to another without altering
the intelligence contained in the original frequency
Heterodying produces 4 frequency - ANSWER ✔✔ 1. The original RF signal
2. The original LO signal
3. The sum of the RF and LO signals
4. The difference of RF and LO signals
Mixer - ANSWER ✔✔ Purpose to produce the IF
Benefits of synthesized tuning Frequency - ANSWER ✔✔ 1. Greater frequency stability
2. Frequency that can be changed electronically which allows for control by microprocessor
3. Reduced costs through the elimination of more
4. Much smaller size
AM - ANSWER ✔✔ amplitude modulation
amp modulation - ANSWER ✔✔ As varying the carrier amp with the instantaneous changes of
the audio signal
Heterodying - ANSWER ✔✔ The process of changing the frequency of a signal to another
frequency without losing the intelligence from the original frequency
Heterodying - ANSWER ✔✔ Creates the original two frequency and there sum and difference
A PLL system consists of _______. - ANSWER ✔✔ Phase detector, frequency counter/ divider,
VCO and loop filter.
Two major categories of frequency synthesis - ANSWER ✔✔ direct and indirect
A typical AM receiver includes: - ANSWER ✔✔ RF section, mixer, LO, IF amp, AM detector,
AGC, and AF amp
The frequency at the output of the IF amp - ANSWER ✔✔ 455kHz
The local oscillator in the am receiver is always tuned to - ANSWER ✔✔ 455kHz above the
tuned RF
, indirect synthesis uses _________? - ANSWER ✔✔ PLL's and VCO's
The purpose of the AGL ckt is to - ANSWER ✔✔ Eliminate fluctuations in the output when the
RF input varies
Receivers may have more than one - ANSWER ✔✔ IF stage
The most significant advantage of SSB transmisson - ANSWER ✔✔ The efficient use of the RF
spectrum
one disadvantage of SSB transmission is that - ANSWER ✔✔ It's impervious to interference
Vestigial Sideband - ANSWER ✔✔ The form of SSB that is used with television video signals
ISB - ANSWER ✔✔ The form of SSB common used by the military
Standard SSB - ANSWER ✔✔ What form of SSB is commonly used by amateur radio
operators?
Balance modulation - ANSWER ✔✔ Produce only the sum and the difference
Effective suppression of the carrier requires? - ANSWER ✔✔ highly matched components
The purpose of the balanced modulation is - ANSWER ✔✔ To suppress the carrier SSB
transmission that are AM modulated
The three methods of SSB GEN are - ANSWER ✔✔ Filter, phase, and weaver methods
The hallmark card of standard SSB is - ANSWER ✔✔ Long term transmission range
SSB packed so closed together in the RF frequency signal - ANSWER ✔✔ Adjacent rejection
Hf system provides - ANSWER ✔✔ Long range high frequency surface to surface, surface to
air, air to air and air to surface, two way voice and data communication
HF systems provide long range coms well over the horizon however sustained connectivity
depends on the three factors listed below - ANSWER ✔✔ High power transmission, sensitive
receivers, ionospheric conditions
Conditions in the ionosphere have a great effect on HF transmission when transmitting frequency
enter the ionosphere they are refracted back to earths surface, creating an area of radio silence
called a - ANSWER ✔✔ Skip zone
QUESTIONS AND ANSWERS| VERIFIED
BY EXPERT| 2025 NEW UPDATE.
Heterodying - ANSWER ✔✔ Converts a signal from one frequency to another without altering
the intelligence contained in the original frequency
Heterodying produces 4 frequency - ANSWER ✔✔ 1. The original RF signal
2. The original LO signal
3. The sum of the RF and LO signals
4. The difference of RF and LO signals
Mixer - ANSWER ✔✔ Purpose to produce the IF
Benefits of synthesized tuning Frequency - ANSWER ✔✔ 1. Greater frequency stability
2. Frequency that can be changed electronically which allows for control by microprocessor
3. Reduced costs through the elimination of more
4. Much smaller size
AM - ANSWER ✔✔ amplitude modulation
amp modulation - ANSWER ✔✔ As varying the carrier amp with the instantaneous changes of
the audio signal
Heterodying - ANSWER ✔✔ The process of changing the frequency of a signal to another
frequency without losing the intelligence from the original frequency
Heterodying - ANSWER ✔✔ Creates the original two frequency and there sum and difference
A PLL system consists of _______. - ANSWER ✔✔ Phase detector, frequency counter/ divider,
VCO and loop filter.
Two major categories of frequency synthesis - ANSWER ✔✔ direct and indirect
A typical AM receiver includes: - ANSWER ✔✔ RF section, mixer, LO, IF amp, AM detector,
AGC, and AF amp
The frequency at the output of the IF amp - ANSWER ✔✔ 455kHz
The local oscillator in the am receiver is always tuned to - ANSWER ✔✔ 455kHz above the
tuned RF
, indirect synthesis uses _________? - ANSWER ✔✔ PLL's and VCO's
The purpose of the AGL ckt is to - ANSWER ✔✔ Eliminate fluctuations in the output when the
RF input varies
Receivers may have more than one - ANSWER ✔✔ IF stage
The most significant advantage of SSB transmisson - ANSWER ✔✔ The efficient use of the RF
spectrum
one disadvantage of SSB transmission is that - ANSWER ✔✔ It's impervious to interference
Vestigial Sideband - ANSWER ✔✔ The form of SSB that is used with television video signals
ISB - ANSWER ✔✔ The form of SSB common used by the military
Standard SSB - ANSWER ✔✔ What form of SSB is commonly used by amateur radio
operators?
Balance modulation - ANSWER ✔✔ Produce only the sum and the difference
Effective suppression of the carrier requires? - ANSWER ✔✔ highly matched components
The purpose of the balanced modulation is - ANSWER ✔✔ To suppress the carrier SSB
transmission that are AM modulated
The three methods of SSB GEN are - ANSWER ✔✔ Filter, phase, and weaver methods
The hallmark card of standard SSB is - ANSWER ✔✔ Long term transmission range
SSB packed so closed together in the RF frequency signal - ANSWER ✔✔ Adjacent rejection
Hf system provides - ANSWER ✔✔ Long range high frequency surface to surface, surface to
air, air to air and air to surface, two way voice and data communication
HF systems provide long range coms well over the horizon however sustained connectivity
depends on the three factors listed below - ANSWER ✔✔ High power transmission, sensitive
receivers, ionospheric conditions
Conditions in the ionosphere have a great effect on HF transmission when transmitting frequency
enter the ionosphere they are refracted back to earths surface, creating an area of radio silence
called a - ANSWER ✔✔ Skip zone
