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69 Cards in this Set
- Front
- Back
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Omnidirectional antennas radiate and receive equally well in what directions?
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all directions.
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An Antenna's length is compared to the physical length of what?
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Of the radio wave it is utilized for.
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What is the most common radio wave?
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A half wave antenna is most common.
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What are the two other names for half wave antennas.
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dipole and hertz.
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What two ways are antennas polarized?
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Antennas are polarized horizontically and vertically.
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What does an antenna's reciprocity mean?
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Its an antennas ability to both transmit and receive.
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How can you double an antenna's use?
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with the appropriate couplers.
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What is feed point?
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It is the point on an antenna where the RF cable is attached.
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What are two types of Feed Points?
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They are end-fed or single-fed.
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What do bidirectional antennas do?
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They radiate and receive efficiently in two directions only.
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What do Unidirectional antennas do?
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They radiate and receive in only one direction. Example is a satallite disk.
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What does a Wire Rope Antenna look like?
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One or more lengths of flexible wire rigged to the ship's structure.
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Where are wire ropes insulated from?
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They are insulated from grounding. If the elements are allowed contact with the hull, all energy is lost.
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Wire rope fans are used in what frequency coverage?
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Medium and high.
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What ways are wire rope fan antenna's polarized?
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vertically or horizontally.
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What is the color code for transmit mounting hardware?
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The color is Red.
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What is the color code for receive mounting hardware?
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The color is blue.
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What way are receive antenna's normally strung?
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They are normally strung vertically.
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Receive antennas are located how far from transmit antennas in order to minimize interference.
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They are located as far as possible from transmit antenna's.
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Wire rope fans are normally what?
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Normally omnidirectional.
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What are the usual lengths for Whip antenna's?
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25, 28, and 35.
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What is the most common length for whip antenna's?
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35 feet.
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Where is a Whip antenna mounted to?
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It is mounted to a deck or a bracket on the superstructure.
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What type of directional is a whip antenna?
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It is omnidirectional.
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A whip antenna is self supporting and may be what?
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Tilted down to the horizontal position.
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The base of a Whip antenna ha some sort of what?
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Has some sort of insulator.
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What is the most common cage antenna?
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The most common cage antenna is a conical monopole antenna.
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What direction is a cage antenna polarized?
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It is polarized vertically.
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What type of directional is a cage antenna?
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It is omnidirectional.
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A cage antenna has a ______ support with several elements surrounding the support.
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Central
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What are normally used for satallite communications systems?
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Dishes are normally used.
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Dishes use what three types of bands?
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UHF, SHF and EHF bands.
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Dishes are what type of directional?
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Dishes are Unidirectional.
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What is required when using dishes?
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Aiming and tracking systems.
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What is a lightweight, broadband, vertically polarized, omnidirectional, twin fan antenna?
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The OE-367(v)3/SRC
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What provides a transmit capability of 2 to 6 mhz and a receive capability of .01 to 17 MHZ.
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OE-367(v)3/SRC
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On the OE-367(v)3/SRC antenna what are the Turnbuckles used to tension?
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They are used to tension the antenna.
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What antenna is the most maintenance intensive?
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The OE-367(v)3/SRC.
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In the OE_367(v)3/SRC antenna the feed lines connect where?
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To a matching network?
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The OE-416/SRC is what type of antenna?
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Receiving only.
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What does the OE-416/SRC look like?
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It is a 14 ft. twin whip antenna.
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What has two AS-3771A/U antennas?
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OE-416/SRC.
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What is the OE-416/SRC receiving ability?
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It is 2 to 30 MHZ.
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What type of insulator does the OE-416/SRC have?
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It has a porcelain bowl insulator.
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Where is the RF signal cabled to on the OE-416/SRC?
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It is cabled to the AN/SRA-49A receive coupler group.
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What does the AS-3772/U antenna look like and what type of antenna is it?
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It is a 35-ft single whip transmit antenna.
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What direction is the AS-3772 polarized?
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It is polarized vertically.
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What is the frequency range for the AS-3772/U?
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2 to 30 MHZ.
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What type of directional is the AS-3772/U?
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Omnidirectional.
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What does the OE-214BU look like and what transmit capability does it have?
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It is 35-ft, twin whip antenna group(Two AS-3772'S) and has a transmit capability of 4 to 12 MHZ.
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What type of directional is the OE-214B/U and what type of polarization is it?
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It is omnidiretional and vertically polarized.
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What does an AS-390A/SRC look like and what is its polarization?
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It is a stub antenna consisting of a radiator and a ground plane and it is vertically polarized.
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What type of wave does the AS-390A/SRC have and what is its transmit capability?
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It is a quarter-wave antenna and has a transmit/receive frequency range of 225 to 400 MHZ.
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What is the commonly used receive antenna for QMCS rack?
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AS-390A/SRC.
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AS-4163/URC looks like what, is what directional, and has what type of polarization?
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It is a 76-inch, base mounted dual-element UHF antenna assembly, is vertically polarized, and is omnidirectional.
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What is the AS-4163/URC's frequency range?
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Its frequency range is 225 to 400 MHZ.
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Inputs to the AS-4163 antenna are connected where?
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connected through two receptacles recessed at the base.
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The AS-1735/SRC has what type of capability and has how many broadband radiating elements?
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It has a transmit/receive capability and has 4 broadband radiating elements.
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The AS-1735 has what polarization, directional, and what frequency reange?
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It is vertically polarized, is omnidirectional, has has a frequency range of 225 to 400 MHZ.
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What is broadband, has a vertical dipole antenna, has transmit and receive capability, is vertically polarized and omnidirectional?
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An AS-2809/SRC
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What is the frequency range of the AS-2809 and what is its capable wattage input?
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it has a frequency range of 115 to 162 MHZ and is capable of 100 watts input.
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What is a base mounted broadband, vertically polarized, omnidiretional, dipole antenna?
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An AS-3226/URC
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What is the frequency range for the AS-3226 and what is its capability?
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It's frequency range is 30 to 76 MHZ and is transmit/receive capable.
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What is the maximum wattage for the AS-3226/URC?
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800 watts maximum.
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What does the AS-3226 look like?
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It is a ruged, lightweight, 12 foot unit sealed within an epoxy fiberglass housing.
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What contains two AS-3018A/WSC-1(v)antennas.
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The OE-82C/WSC-1(v)
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How much coverage does the OE-82C provide and what is it's frequency range?
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It provides 180 degrees of coverage per each antenna and it's frequency range is 240 to 318 MHZ.
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What is the elevation of the OE-82C?
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between 2 and 110 degrees.
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Where does the OE-82c receive input for automatic tracking?
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It receives input from the ship's gyro.
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