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ACOM/IFT CAT 1 > HF > Flashcards

HF Flashcards

1
Q

What is the function of the HF Radio Subsystem?

A

provide long-range secure and nonsecure voice and data communications;
enhance EAM injection by increasing redundancy;
back up the VLF TACAMO broadcast

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2
Q

Where is the HF 1 Antenna located?

A

wire antenna between the fuselage and vertical stabilizer

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3
Q

Where is the HF 2 Antenna located?

A

vertical fin on top aft section of vertical stabilizer

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4
Q

Where is the HF 3 Antenna located?

A

port wing tip probe

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5
Q

Where is the HF 4 Antenna located?

A

probe on top forward section of vertical stabilizer

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6
Q

Where is the HF 5 Antenna located?

A

starboard wing tip probe

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7
Q

What are the power requirements for the HF Antennae?

A

Passive

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8
Q

Where are the HF Radio Set Controls and how many are there?

A

HF 2-5 are in P30 Bays 2 & 3

HF 1 is on center aisle in flight deck

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9
Q

What are the power requirements for the HF Radio Set Controls?

A

9 VDC from respective R/T

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10
Q

What is the function of the HF Radio Set Controls?

A

provide serial, digital, remote control of the radio set and display faults and operational status

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11
Q

How many preset channels are available on the HF Radio Set Control and what are they?

A

30 presets

channels 00-29

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12
Q

How many possible channels can be accessed manually and what is the frequency range?

A

280,000 channels spaced at 100 Hz increments

from 2.0000 to 29.9999 MHz

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13
Q

What are the modes available on the HF Radio Set Control MODE Thumbwheel Selector?

A

Upper Sideband Voice (UV); Upper Sideband Data (UD); Lower Sideband Voice (LV); Lower Sideband Data (LD); Amplitude Modulation Equivalent (AM); Preset (P); Unidentified (A); Continuous Wave (CW)

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14
Q

A frequency selection below ____ will cause a CONT FAULT indication.

A

2.0000 MHz

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15
Q

Where is the HF FAULT/TUNE Panel located?

A

P30 Bay 3

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16
Q

What are the power requirements for the HF FAULT/TUNE Panel?

A

28 VDC from MISC CONT c/b on P 30 DISTR 2

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17
Q

What is the function of the HF FAULT/TUNE Panel?

A

provide remote monitoring of the fault status of each HF radio; allow disabling of auto-retuning function

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18
Q

Where is the HF Preselector Bandpass Filter located?

A

HF 2-5 = E43 Bay 1

HF-1 = E45, fwd lower lobe

19
Q

What are the power requirements for the HF Preselector Bandpass Filter?

A

115 VAC 400 Hz from respective R/T

28 VDC from internal power supply of respective R/T

20
Q

What is the function of the HF Preselector Bandpass Filter?

A

provide filtering for circuits and offer additional selectivity to receiver during reception and to Power Amplifier (PA) during transmission

21
Q

Where is the HF Power Monitor Panel located?

A

P30 Bay 3; above second HF Radio Set Control

22
Q

What are the power requirements for the HF Power Monitor Panel?

A

Passive

23
Q

What is the function of the HF Power Monitor Panel?

A

to allow measurement of the forward (F) and reflected (R) power output of the HF-3, 4, & 5 R/Ts

24
Q

Where are the HF R/Ts located?

A

HF 2-5 = E43 Bay 1

HF 1 = E45 cabinet, fwd lower lobe

25
Q

What are the power requirements for the HF R/Ts?

A

HF 2-5 = 115 VAC 400 Hz from P67-2 via MDF

HF 1 = 115 VAC 400 Hz from HF No. 1 c/b on P5

26
Q

What is the function of the HF R/Ts?

A

convert audio signals into RF signals for transmission;

convert received RF signals into audio signals during reception

27
Q

What is the output of the HF Power Amplifier (PA)?

A

400 W

28
Q

Where is the HF SIMOP Bandpass Filter located?

A

HF 1 = E45, fwd lower lobe;
HF 2 = E43 Bay 1; HF 3 = E43 Bay 4;
HF 4 = E43 Bay 2; HF 5 = E43 Bay 4

29
Q

What are the power requirements for the HF SIMOP Bandpass Filters?

A

115 VAC 400 Hz from MDF

30
Q

What is the function of the HF SIMOP Bandpass Filters?

A

provide highly selective filtering for tx and rx signals to reduce broadband noise and allow SIMOP of the HF radios; provide impedance matching between antenna & HF R/T

31
Q

Where is the HF Keyline Control Panel located?

A

P30 Bay 2

32
Q

What are the power requirements for the HF Keyline Control Panel?

A

Passive

33
Q

What is the function of the HF Keyline Control Panel?

A

allow keying of HF R/Ts 3-5; select PTT, constant keyline, or disabled keyline

34
Q

Where is the ANDVT BTU (TSEC 8) located?

A

rear of P30 Bay 2

35
Q

What are the power requirements for the ANDVT BTU (TSEC 8)?

A

28 VDC from SECURE VOICE TSEC 8 c/b on P30 DISTR 2

36
Q

What is the function of the ANDVT BTU (TSEC 8)?

A

voice processing, coding, and MODEM function;

enable HF 3, 4, & 5 to tx & rx secure voice communications

37
Q

Where is the ANDVT Split Remote Control Unit (RCU) located?

A

P30 Bay 3; above HF Power Monitor Panel

38
Q

What are the power requirements for the ANDVT Split RCU?

A

28 VDC from SECURE VOICE TSEC 8 c/b on P30 DISTR 2

39
Q

What is the function of the ANDVT Split RCU?

A

allow remote operation of the ANDVT and provide an indication of its operating status

40
Q

Where are the Antenna Couplers with Lightning Arresters located?

A

port and stbd wing tip pods

tail fin assembly, adjacent to the HF antennae

41
Q

What are the power requirements for the Antenna Couplers with Lightning Arresters?

A

Passive

42
Q

What is the function of the Antenna Couplers?

A

to provide an impedance match between the antenna and the R/T

43
Q

What is the function of the Lightning Arresters?

A

to provide electrical surge protection to the HF Radio Subsystem

ACOM/IFT CAT 1 (27 decks)

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