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66 Cards in this Set
- Front
- Back
What is the minimum bend radius for flexible coax cables? When subject to repeated flex?
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10 times the cables diameter/ 20 times
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What is the minimum resistance between the conductors of a multi-conductor cable?
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50,000 ohms
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What are Waveguides made of?
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Drawn aluminum, bronze, copper or silver tubing
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Waveguides come in pre-bent pieces at what angles?
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45, 60, 90
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Who manufatures Heliax Cable?
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Andrew Corporation
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Elliptical Waveguide is a kind of _______.
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Heliax Cable
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For all objects that a waveguide is not connected to requires a ____ inch clearance.
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2 inch
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Waveguide/ Rigid Coax supports shall never exceed ____ distance apart.
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5 ft.
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Waveguides that exceed ___ inches shall have ___ supports.
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24 inches
2 supports |
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Tighten the clamping bar screws to ensure a minimum gap of ___ inch exists
between the clamp support and clamp saddles. |
1/16
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T/F
It is permissable to store flexible cable by hanging it from a hook/dowel etc. |
F
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T/F
It is permissble to use block and tackle or other mechanical devices to pull flexible cable. |
F
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Coaxial Cables installed on masts within the beam pattern of radars that operate at ____Mhz to ____Mhz shall be ______.
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200-450Mhz
properly shielded |
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Coxial Cables should show an insulation resistance of ____ at 100ft or less.
200ft? 500ft? 1000ft? |
40000 Mohm=100ft
20000 Mohm=200ft 8000 Mohm=500ft 4000 Mohm=1000ft exactly proportionate |
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T/F
Cables crossing expansion joints must have slack equal to at least twice the maximum movement of the expansion joint. |
F
atleast equal to the max expansion |
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What side of beams or other supports structure should coax cable be routed? Why?
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In-board
Battle Protection |
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Radar, radio, antenna, sonar transducers should be separated from all other cables by ____ inches.
Sonar Hydrophone? |
18 inches
6 inches |
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What does a cable tag starting with R-A mean?
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Meterological Equipment
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What does a cable tag starting with R-B mean?
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Beacons
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What does a cable tag starting with R-C mean?
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Countermeasures
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What does a cable tag starting with R-D mean?
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Data
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What does a cable tag starting with R-E mean?
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Radar
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What does a cable tag starting with R-EA mean?
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Air Search Radar
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What does a cable tag starting with R-ES mean?
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Surface Search Radar
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What does a cable tag starting with R-F mean?
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Weapon Control
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What does a cable tag starting with R-G mean?
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Telemetering or remote control electronics guidance
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What does a cable tag starting with R-H mean?
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CW Passive Tracking
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What does a cable tag starting with R-I mean?
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IFF
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What does a cable tag starting with R-K mean?
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Timing
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What does a cable tag starting with R-L mean?
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Automatic Vectoring
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What does a cable tag starting with R-M mean?
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Missile Support
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What does a cable tag starting with R-N mean?
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IR equipment
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What does a cable tag starting with R-O mean?
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Optical
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What does a cable tag starting with R-P mean?
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Special purpose
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What does a cable tag starting with R-R mean?
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Radio Comms.
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What does a cable tag starting with R-S mean?
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Sonar
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What does a cable tag starting with R-T mean?
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Television
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T/F
On terminal blocks more than one conductor can be crimped into one terminal lug. |
F
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When weather proofing/coax cable repair how many coats of liquid plastic are required?
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3
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T/F
Flexible waveguide assemblies can be used for bends. |
F
only to compensate for excess stress from expansion or vibration |
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How shall twist assembly waveguides be fabricated?
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not exceed 90degrees of twist
and length is an integral multiple of half of the wavelength of the nominal freq. |
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T/F
Two "E" or "H" waveguide bends can be connected. |
F
unless no other arrangement is possible |
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What must be done to a waveguide before it can be bent?
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Annealed
(chemically softened) |
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In waveguides running parallel to each other flanges(connections) shall be spaced ___ inches apart?
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6 inches
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What can be used as a waveguide template?
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1/2 inch pipe
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Exluding bends twists and offsets; what is the deviation on a straight run of a waveguide?
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1/4 inch
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What size does rigid coax come in?
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3/8 - 6 1/8 inch diameter
20ft lengths |
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What type of elbow pieces are available for rigid coax?
T/F It is permissable to use a different size elbow. |
90 and 45 degree mitered
F |
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What is the maximum size of elliptical waveguide availible in spools? What is the designator for the most common larger elliptacl waveguide and what lengths do they come?
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RG-395/U
RG-387/U 20ft lengt |
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What does a cable tag that ends with /Q signify?
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"red" cables
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What does a cable tag that ends with /T signify?
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Automatic Test Equipment
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What does a cable tag that ends with /E signify?
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Experimental Circuit
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What does VSWR stand for?
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Voltage Standing Wave Ratio
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What is the minimum insulation resistance values for cable with circular mil fare of less than 1700.
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50,000ohms
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Waveguids are normally supplied in what lengths?
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10-14ft Sections
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What is annealing? When do you do it?
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Softening a waveguide prior to bending.
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What is the maximum bow for an installed waveguide?
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.010 inch edgewise and .020 inch flatwise between two points @ two feet apart.
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What can you make waveguide tmeplates out of
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1/2 inch pipe
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Waveguide supports should be no closer than ___ to flange connections.
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6 Inches
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What are the three waveguide/ waveguide support isolation methods?
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a) Coat with 1/16 inch vinyl plastic (PLASTISOL) (WOULD DAMAGE WAVEGUIDE)
b) 3/16 inch Neoprene Class 11, Grade 30 c) Use sealer putty and plastic tape |
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When purging Waveguides how long shall they be Pressurized how long should they be bled?
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2 hours
2hours |
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What VSWR should be corrected in transmission lines if no other guidance is offered.
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1.25:1
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Can rigid COAX be reduced from 6-1/8 inch to 3/8?
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Yes but only one size at a time. (6-1/8 to 3-1/8) (3-1/8 to 1-5/8) (1-5/8 to 7/8) (7/8 to 3/8)
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Can Steel wool or Emery paper be used in electronic equipment?
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NO
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What size should a 2M work station be?
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24"x30"
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What is the goal for failed CCA repair by the 2M station?
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80%
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