2015-G4A: Station Operation and set up
What is the purpose of the "notch filter" found on many HF transceivers?
To reduce interference from carriers in the receiver passband
To restrict the transmitter voice bandwidth
To eliminate receiver interference from impulse noise sources
To enhance the reception of a specific frequency on a crowded band
What is one advantage of selecting the opposite or "reverse" sideband when receiving CW signals on a typical HF transceiver?
It may be possible to reduce or eliminate interference from other signals
Interference from impulse noise will be eliminated
More stations can be accommodated within a given signal passband
Accidental out of band operation can be prevented
What is normally meant by operating a transceiver in "split" mode?
The transceiver is set to different transmit and receive frequencies
The radio is operating at half power
The transceiver is operating from an external power source
The transmitter is emitting an SSB signal, as opposed to DSB operation
What reading on the plate current meter of a vacuum tube RF power amplifier indicates correct adjustment of the plate tuning control?
A pronounced dip
A pronounced peak
No change will be observed
A slow, rhythmic oscillation
What is a reason to use Automatic Level Control (ALC) with an RF power amplifier?
To reduce distortion due to excessive drive
To balance the transmitter audio frequency response
To reduce harmonic radiation
To increase overall efficiency
What type of device is often used to match transmitter output impedance to an impedance not equal to 50 ohms?
Antenna coupler or antenna tuner
What condition can lead to permanent damage to a solid-state RF power amplifier?
Excessive drive power
Insufficient drive power
Low input SWR
Shorting the input signal to ground
What is the correct adjustment for the load or coupling control of a vacuum tube RF power amplifier?
Maximum power output without exceeding maximum allowable plate current
Minimum SWR on the antenna
Minimum plate current without exceeding maximum allowable grid current
Highest plate voltage while minimizing grid current
Why is a time delay sometimes included in a transmitter keying circuit?
To allow time for transmit-receive changeover operations to complete properly before RF output is allowed
To prevent stations from interfering with one another
To allow the transmitter power regulators to charge properly
To allow time for a warning signal to be sent to other stations
What is the purpose of an electronic keyer?
Automatic generation of strings of dots and dashes for CW operation
Automatic transmit/receive switching
Computer interface for PSK and RTTY operation
Which of the following is a use for the IF shift control on a receiver?
To avoid interference from stations very close to the receive frequency
To change frequency rapidly
To permit listening on a different frequency from that on which you are transmitting
To tune in stations that are slightly off frequency without changing your transmit frequency
Which of the following is a common use for the dual VFO feature on a transceiver?
To permit monitoring of two different frequencies
To allow transmitting on two frequencies at once
To permit full duplex operation, that is transmitting and receiving at the same time
To facilitate computer interface
What is one reason to use the attenuator function that is present on many HF transceivers?
To reduce signal overload due to strong incoming signals
To reduce the transmitter power when driving a linear amplifier
To reduce power consumption when operating from batteries
To slow down received CW signals for better copy
What is likely to happen if a transceiver’s ALC system is not set properly when transmitting AFSK signals with the radio using single sideband mode?
Improper action of ALC distorts the signal and can cause spurious emissions
ALC will invert the modulation of the AFSK mode
When using digital modes, too much ALC activity can cause the transmitter to overheat
All of these choices are correct
Which of the following can be a symptom of transmitted RF being picked up by an audio cable carrying AFSK data signals between a computer and a transceiver?
All of these choices are correct
The VOX circuit does not un-key the transmitter
The transmitter signal is distorted
Frequent connection timeouts
● = Unseen
● = Weak
● = Review
● = Learned
● = Incorrect answer