Exam (elaborations)
ATT-(ET) WEEK 13: QUESTIONS &CORRECT SOLUTIONS
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ATT-(ET) WEEK 13: QUESTIONS &CORRECT SOLUTIONS
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ATT-(ET) WEEK 13: QUESTIONS &CORRECT SOLUTIONSAmplitude Modulation (AM) Right Ans - may be defined as varying the
carrier amplitude with the instantaneous changes of the audio signal.
Heterodyning Right Ans - is the process of changing the frequency of a
signal to another frequency without losing the intelligence from the original
frequency.
Local Oscillator Right Ans - the AM receiver is always turned to 455kHz
above the tuned RF.
455kHz above tuned RF Right Ans - the local oscillator in the AM receiver is
always tuned to _________.
455kHz Right Ans - The frequency at the output of the IF amp should be
within _______.
PLL System Right Ans - consists of phase detector, frequency
counter/divider VCO and loop filter.
Automatic Gain Control (AGC) Right Ans - is the purpose of the circuitry is
to eliminate fluctuations in the output when the RF input varies.
PLL and VCO Right Ans - Indirect synthesis uses ________.
USB and LSB Right Ans - The transmitted signals at the _____ are always
180° out of phase.
Standard SSB
Independent Sideband (ISB)
Vestigial Sideband Right Ans - SSB transmission come in variety of formats:
Standard SSB Right Ans - is the form of SSB commonly used by amateur
radio operators.
Independent Sideband (ISB) Right Ans - is a form of SSB commonly used by
the military.
, Vestigial SSB Right Ans - is the form of SSB that is used with television
video signals.
product detectors and balanced modulators Right Ans - Demodulation in
SSB receivers is normally accomplished through the use of ______________.
supress the carrier Right Ans - The purpose of the balanced modulator is to
__________.
sum and difference Right Ans - Balanced Modulators produce only the
___________.
highly matched components Right Ans - In a balanced modulators effective
suppression of the carrier requires ________.
HF System Right Ans - Its the main purpose to provide long-range high
frequency surface, surface to air, and air-to-air radio communications.
- High power Transmitter
- Sensitive Receivers
- Ionospheric Conditions
3MHz to 30MHz Right Ans - The frequency range for HF system is
__________?
the higher the sun, the higher the frequency. Right Ans - The basic rule of
thumb for HF communications is __________.
USB, Carrier, LSB Right Ans - The components of an AM signal are ____?
ionospheric density, transmitter operating frequency, and angle at which
radio waves strike the ionosphere Right Ans - The factors that influence
ionospheric refraction is ______________.
USB Right Ans - The most common mode of operation of HF systems is
_______?
critical frequency Right Ans - Each layer of the ionosphere has a maximum
frequency that it will retract, known as the ____________.
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