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Extra Class Exam Question Pool

effective 7/01/2016 thru 6/29/2020

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2016-E2E: Operating methods: operating HF digital modes

2016-E2E01: Which type of modulation is common for data emissions below 30 MHz?


DTMF tones modulating an FM signal

Pulse modulation

Spread spectrum

2016-E2E02: What do the letters FEC mean as they relate to digital operation?

Forward Error Correction

First Error Correction

Fatal Error Correction

Final Error Correction

2016-E2E03: How is the timing of JT65 contacts organized?

Alternating transmissions at 1 minute intervals

By exchanging ACK/NAK packets

Stations take turns on alternate days

It depends on the lunar phase

2016-E2E04: What is indicated when one of the ellipses in an FSK crossed-ellipse display suddenly disappears?

Selective fading has occurred

One of the signal filters is saturated

The receiver has drifted 5 kHz from the desired receive frequency

The mark and space signal have been inverted

2016-E2E05: Which type of digital mode does not support keyboard-to-keyboard operation?





2016-E2E06: What is the most common data rate used for HF packet?

300 baud

48 baud

110 baud

1200 baud

2016-E2E07: What is the typical bandwidth of a properly modulated MFSK16 signal?

316 Hz

31 Hz

550 Hz

2.16 kHz

2016-E2E08: Which of the following HF digital modes can be used to transfer binary files?





2016-E2E09: Which of the following HF digital modes uses variable-length coding for bandwidth efficiency?





2016-E2E10: Which of these digital modes has the narrowest bandwidth?



170 Hz shift, 45 baud RTTY

300-baud packet

2016-E2E11: What is the difference between direct FSK and audio FSK?

Direct FSK applies the data signal to the transmitter VFO

Audio FSK has a superior frequency response

Direct FSK uses a DC-coupled data connection

Audio FSK can be performed anywhere in the transmit chain

2016-E2E12: Which type of control is used by stations using the Automatic Link Enable (ALE) protocol?




ALE can use any type of control

2016-E2E13: Which of the following is a possible reason that attempts to initiate contact with a digital station on a clear frequency are unsuccessful?

All of these choices are correct

Your transmit frequency is incorrect

The protocol version you are using is not the supported by the digital station

Another station you are unable to hear is using the frequency

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2016-E2D: Operating methods: VHF and UHF digital modes and procedures; APRS; EME procedures, meteor scatter procedures
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2016-E3A: Electromagnetic waves; Earth-Moon-Earth communications; meteor scatter; microwave tropospheric and scatter propagation; aurora propagation
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