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block

A typical problem encountered when troubleshooting a frequency synthesizer is

Select the correct answer(s).  

(0/0)

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A large frequency error

All the above

No output

A small frequency error

none

The type of radio transmission that uses pseudorandomly switched frequency or time transmissions is known as

Select the correct answer(s).  

(0/0)

---

Facsimile

Spread spectrum

Synthesizing

Compression

none

The acronym CDMA refers to ________.

Select the correct answer(s).  

(0/0)

---

Code-division multiple-access systems

Channel-division multiple-access systems

Capture-division multiple-access systems

Carrier-division multiple-access systems

none

The disadvantage of direct digital synthesizers (DDS) over analog frequency synthesizers is

Select the correct answer(s).  

(0/0)

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Its higher phase noise

Its complexity and cost

Its limited maximum output frequency

All the above

none

The tuned circuits prior to the mixer in a superheterodyne receiver are called the

Select the correct answer(s).  

(0/0)

---

All the above

Front end

Tuner

Preselector

none

Two-modulus dividers are used in the synthesis of frequencies into the VHF band due to

Select the correct answer(s).  

(0/0)

---

The insufficient speed and power of the basic programmable divider designs

Its ability to work at practical power consumptions

All the above

Its ability to work at practical speeds

none

The G.E. Phoenix radio is an example of

Select the correct answer(s).  

(0/0)

---

An HF amateur transceiver using AM and SSB modulation modes

A military transceiver using all modes on HF frequencies

A VHF commercial transceiver using the FM modulation mode and a channel guard function

A cellular telephone transceiver

none

A transceiver is

Select the correct answer(s).  

(0/0)

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A receiver that receives digital data

A transmitter that can be tuned to several bands of frequencies

A transmitter that transmits digital data

A transmitter and receiver in a single package

none

The range over which the input to a receiver or amplifier provides a usable output is called the

Select the correct answer(s).  

(0/0)

---

Degree of usefulness

Level of acceptability

Specified input

Dynamic range

none

Up-conversion offers the following advantage(s):

Select the correct answer(s).  

(0/0)

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Good image-frequency rejection and Minimized tuning range for the LO

Minimized tuning range for the LO

Less expensive filters

Good image-frequency rejection

none

A receiver has a 30-dB noise figure, a 1.5 Mhz bandwidth, a 6-dBm third intercept point, and a 3-dB signal-to-noise ratio. Its sensitivity is

Select the correct answer(s).  

(0/0)

---

–81 dB

–94 dB

–82.2 dB

-79.2 dB

none

An AM broadcast receiver has two identical tuned circuits with a Q of 50 prior to the IF stage. The IF frequency is 460 kHz and the receiver is tuned to a station on 550 kHz. The image-frequency rejection is

Select the correct answer(s).  

(0/0)

---

36.2 dB

72.4 dB

41 dB

82 dB

none

Why are image frequencies somewhat less of a problem in FM receivers than they are in SSB or AM receivers?

Select the correct answer(s).  

(0/0)

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FM receivers do not use the superheterodyne design.

SSB uses less bandwidth than does FM.

FM signals have a capture effect characteristic

FM mixer stages are square-law devices.

none

The signal-strength meter that shows the relative signal-strength level is called the ________ .

Select the correct answer(s).  

(0/0)

---

All the above

Strength meter

Signal meter

S meter

none

An AGC that causes a step reduction in receiver gain at some arbitrarily high value of received signal in order to prevent overloading the receiver is known as

Select the correct answer(s).  

(0/0)

---

Auxiliary AGC

Delayed AGC

Arbitrary AGC