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To determine if a facility is protected against Lightning what manual would you use?
MIL-STD-188-124B and MIL-HDBK-419 (Volume 1 and 2)
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When dealing with lightning protection all antennas must be inside a ___ cone of protection?
1:1
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All down conductors of the lightning
protection subsystem have bends with a radius less than __ cm (_ inches) or bends
not less than __°?
20cm 8inches 90°
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Are all metal objects within __ meters (_ ft)
of the lightning down conductor bonded or
grounded to the facility ground?
1.8 meters, 6 ft
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Are all bonds between elements of the
lightning protection subsystem ______,
______, or secured by _________ clamps?
welded, brazed, or secured by UL-approved clamps?
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Are two tower legs independently grounded
to the _________________________?
earth electrode subsystem
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Are the down conductors from the tower
bonded to the tower at the ____?
base
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What are the three different types of MILSTRIPs in FLS?
- • Free issue items that are stocked in NESSS
- • Cost items that are stocked in NESSS
- • Items that are purchased from other DOD agencies
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What fields labeled in blue below (and on the MILSTRIP form) are required entries?
UI, Status
Demand Code
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In FLS Milstrip with the exception of the ____ ___ ____ field, these can be changed as needed.
From Svc Code
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In the Priority field, enter the priority of the MILSTRIP:
- ● Priority 02 or 03 for Emergency requisitions.
- ● Priority 05 or 06 for Mission Impaired requisitions.
- ● Priority 12 or 13 for Routine requisitions.
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If this NIIN is a “Free Issue” NIIN, the Fund Code will be __.
00
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In a milstrip if this a cost NIIN the Fund Code field will be ______.
blank
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If the NIIN is NOT managed in _____, data fields will not be filled in.
NESSS
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Note: The maximum quantity for MTR items is _. If more than one MTR item is needed, create one MILSTRIP per item.
1
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What is a RIC in milstrips?
Routing Identifier Code
-
In the Signal Code field, use the LOV to update the signal code:
Free Issue Item
_ Ship to the requisitioner, no bill required
_ Ship to the supplementary address, no bill required
Cost Item
_ Ship to the requisitioner, bill the requisitioner
_ Ship to the supplementary address, bill the requisitioner
D M A J
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The Supplementary Svc Code field defaults to _.
● When an OPFAC is selected in the Supp Addr field, the Supplementary Svc Code field changes to _.
● If the Supp Addr field is not used, the Supplementary Svc Code should remain a _.
Y Z Y
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What is the antennas and transmission lines testing Interval for a shore unit?
Quarterly or as the local environment dictates.
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What is the antennas and transmission lines testing Interval for a floating unit?
Monthly or at the end of each extended period at sea
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What is the antennas and transmission lines testing Interval for a Submarine cable?
Annually.
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For a Wave-guide what should be used to test it instead of a megger?
Use VSWR testing.
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For a whip antenna what should be used to test it instead of a megger?
Refer to technical manual.
Note: Some whip antennas may contain discrete components or exhibit the characteristics of an electrical short and should not be tested with a megger.
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For a Wire antenna what should be used to test it instead of a megger?
Use a Time Domain Reflectometer (TDR).
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For a VHF/UHF antenna what should be used to test it instead of a megger?
Refer to technical manuals or contact NAVSEA.
Note: Due to their high operating frequency, the DC resistance of VHF/UHF antennas is near zero, therefore megger testing is impractical and inconclusive.
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What should you not use a megger on?
VHF/UHF antenna, Wave Guide, Wire antenna, and Whip antenna
-
Use the _____________ Resistance Test Record Card to record the results of megger testing on transmitting and receiving antenna systems and submarine cables. This
includes antennas, insulators, and
transmission lines.
NAVSEA 9210/19
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The megger generates high voltage approximately ___ volts DC.
500
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Use the Megger to test antenna and transmission lines separately
because:
- • The voltage developed by the megger can cause circuit damage in equipment left connected
- • A true reading of the antenna/transmission line cannot be obtained when equipment is left connected due to the circuit providing a path to ground
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Should you use a separate NAVSEA 9210/19 each transmission line or antenna?
Yes
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After testing with a megger maintenance is needed if?
- • The Resistance Test Record indicates a pattern of slowly deteriorating readings or sudden changes
- • The reading shows a resistance of 200 megaohms or less
- Important: A resistance of 5 megaohms or less indicates an
- immediate and urgent need to correct the problem.
-
What reading on a megger would require an immediate replacement of the gear that you are testing?
A resistance of 5 megaohms or less indicates an immediate and urgent need to correct the problem.
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The Time Domain Reflectometer (TDR) is capable of sending a pulse
down a cable and measuring the reflected pulse back. This measurement
provides:
- • The cable’s impedance
- • Distance of the cable
- • Visual indication of sharp bends, or kinks
- • Visual indication of cuts or nicks
- • Visual indication of end of the cable
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The two types of TDR’s most widely used in the USCG are the:
•Tektronix Model 1503B
•Tektronix Model 1502 TDR Cable Tester
The 1502 is an analog TDR and 1503B is digital.
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To complete the tests in the TDR manual you need?
• A TDR
• The technical or operators manual
• A 6-ft length of RG-58 cable to connect to your TDR
-
-
-
-
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Who creates Permissible Exposure Limits (PEL) boundaries?
Telecommunications and Information Systems Command (TISCOM)
-
This cause tissue damage that results primarily from the body's inability to cope with or dissipate excessive heat.
-
This causes Immunological, neurological, and behavioral changes may result from lower levels of RF radiation.
-
This happens when the distance between two conductors exceed the breakdown voltage of the dielectric
-
This occurs when RF radiation can induce a current on improperly grounded, or ungrounded conductors, such as metal or wet objects
-
It limits define the maximum time and intensity of RF fields that an individual can be exposed to without sustaining injury
-
Who identifies radiation hazards in the unit?
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Who published guidelines to be used for evaluating human exposure to RF emissions?
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What is the PEL for General Population/Uncontrolled Exposure category?
-
What happens when a worker is exposed to a power density limit 3 times higher than the limit?
-
What is a boundary that physically marks an area as a radiation hazard zone?
-
Where are RADHAZ warning signs placed?
-
Who has the chief responsibility to ensure the safety and health of all personnel under his/her command?
The CO
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Who is responsible for ensuring that all new reporting personnel receive safety and familiarization training before engaging in the operation, repair, and maintenance?
-
* indicates what in a NMEA sentence?
-
Slice is missing from SPS/50 radar image?
-
PG 500 LEDs illuminate after calibration?
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OPS multi cable tag numbers start how?
O-001-01
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Engineering cable tags start how?
E-001
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All CASREPs underway are designated at least what?
-
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DF sensitivity requirements?
-
DF antenna elements resistance
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