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34 Cards in this Set

  • Front
  • Back
Electrical energy used by
electronic communication travels at
what rate?
Speed of light
What is/are the major
disadvantage(s) of radiotelegraph?
Slow speed and the need for
experienced operators at both
ends
What frequency bands were
originally used for
radiotelegraphy?
VLF and LF
What frequency bands have the
prominent feature of ionospheric
reflection?
VHF and UHF
VHF and UHF bands are known as what
type of transmission band?
Line of Sight
Which of the following functions is performed by the IRC panel?
Controls UHF radio modes and
functions
Controls HF radio modes and
functions.
Displays IFPM status of
communication subsystems and
components
The BITE indicator on the IRC panel
will illuminate when a fault is
detected in the
This indicator will illuminate when a
fault is detected in the IRC.
The LS-601/AI crew control panels
are all identical and operate the
same at each station.
TRUE OR FALSE
TRUE
Which of the following control(s)
is/are located on the LS-602/AI
control panel?
1. Radio select only
2. ICS select only
3. Volume control only
4. Radio select, ICS select, and
volume control
3. Volume control only
What is the interrogation rate for
each crew ICS panel and IRC by the
change-of-status request from the
SLU?
Every 25 milliseconds, each crew panel and the IRC are
interrogated for a change-of-status by the SLU.
What will the S indicator
illumination on the crew control
panels indicate for a particular
radio system?
The S indicators on the crew panels will
illuminate red when the secure mode of operation is
selected for that particular radio system.
In the ICCG, which of the following
components does NOT have identical
binary coding and decoding
circuits?
1. SLU
2. IRC
3. LS-601/AI
4. LS-602/AI
4. LS-602/AI
What binary number is recognized by
the SLU as the pilot crew ICS panel
in bits 2 through 6 of the 36-bit
format?
One
example of this is that the SLU recognizes the binary
number 01010 as the pilot crew ICS panel.
What is bit 36 of the 36-bit format
used for by the ICCG?
Bit 36 is the parity bit used for self-check in the
binary circuitry.
In the Manchester word format, what is
the clock pulse rate?
120 kHz
What component generates the roll
call for the communication system?
The crew ICS panels
and the IRC have unique binary word addresses that are
identified by a roll call sequence performed in the SLU.
The exhale word is a status word
between the SLU and what component(s)?
the exhale
word is a status word Between the GPDC and the SLU,
the exhale word is also a status word.
Which ICCG component recognizes and
processes the first part of roll
call 1 through the digital control
section, line receiver, and inhale
word register?
The IRC is the only ICCG component
that recognizes roll call 1, and it processes the
roll call through the digital control section, line receiver,
and inhale word register.
Which ICCG component generates the
second part of roll call 1?
The second part of roll call 1 is generated in the IRC.
Where are the data and clock pulses
separated in the SLU?
Inhale word register
Which components in the ICCG
respond to more than one roll call
address?
The IRC and
components that respond to
the SLU are the only
more than one roll call
What circuit in the SLU is used to
shift data from one buffer to
another once the data is shifted to
the input register in the SLU?
Once the data is shifted to the input
register, the master clock is used to shift the data from
one buffer to another.
What happens in the SLU if the input word is invalid three times?
If the input word is invalid three
times, the status register sets the BITE indicator on the
component that sent the word.
When does the IRC/SLU roll call exchange end?
The IRC/SLU roll call exchange ends with the first
part of roll call 8.
Which crew ICS panel process the first part of roll call 9?
When the first part of roll call 9 is on the
multiplex line, it is recognized by the TACCO crew ICS
panel,
What is the frequency range of the AN/ARC-197 VHF transceiver?
Its actual frequency range is from 116.000 to 151.975 MHz.
How many preset channels are available with the
AN/ARC-187 radio set?
20
What fault is indicated when the fault indicator
on the C-11950/ARC-187 control box flashes at
a slow rate?
interface fault
The HF-2 long-wire antenna has degraded
operation at which frequencies?
The HF-2 antenna has two degraded frequency
ranges where coupling might not be possible: 7.9000 to
9.1000 MHz and 18.9000 to 20.1000 MHz.
What is the purpose of the lightning arrester used
in the HF system?
The lightning arrester provides a spark
gap to protect the radio if lightning strikes the long-wire
antenna.
What radio sets can be used with the data link
system?
Either HF-1,
HF-2, or UHF-2 may be used to transmit and receive
data link.
Who has primary responsibility for the hardware
setup of the data link system?
The NAV/COMM has primary responsibility for the
hardware setup of the data link system
Which unit in the TTY system provides the
interface with the radios?
TTY signal data converter
Which unit connects the TTY system with the
central computer?
Communications interface No. 1