COBHAM Sea Tel 9711-56 IMA C Band, Installation Manual

Page: 228 / 234

Procedure, General Strain Relief Installation
Page 1 of 4
Document No
136505 Rev A
Form # 117140-D
1.0
Purpose.
To define the installation procedure for installing strain reliefs in the base pan of
the radome.
2.0
Scope.
This installation procedure applies to fiberglass base pans used in Sea Tel’s 75”, 81”
and 110” base frames.
3.0
Tools/materials.
1. Electric drill.
2. Small drill bit 1/8” dia. (3-4mm dia.).
3. Hole saw, 1 3/8” dia. (35 mm), with mandrel and ¼” dia. pilot drill.
4. Medium file.
5. Two 1-1/2” (38 mm) adjustable pliers.
6. Fiberglass resin & catalyst, (marine grade) - at least 2 oz (50 cc).
Such as Tap Plastics Marine Vinyl Ester Resin with MEKP Catalyst.
Note: Use liquid resin, instead of paste type, due to better penetration.
7. Mixing cup – 4 oz (100 cc).
8. Disposable brush.
9. Strain Relief Assembly 124903-1, (one per cable).
4.0
Responsibilities.
It is the responsibility of the installer to observe all standard safety
precautions, including eye, slip, and chemical protection when performing this procedure.
5.0
Procedure.
5.1 Planning
Strain reliefs should be installed near center of the base pan so that cable installed will not
cause a tripping hazard inside the radome. Only one cable may be installed in each strain
relief. Center-to-center spacing of the holes for the strain reliefs must not be less than 1.80”.
• Typical Transmit/Receive systems will need up to 4 strain reliefs; TXIF coax, RXIF
coax, Pedestal Power and Marine Air Conditioner Power.
• Typical TVRO antennas may require up to 7 strain reliefs; 2 C-band coaxes, up to 4
Ku-band coaxes and Pedestal Power.
5.2 Measure, mark and drill pilot holes
Accurately measure and mark the hole locations on the base pan from the inside of the
radome. Drill a pilot hole through each planned location using the small drill bit (~1/8” dia)
and only light pressure.
5.3 Use the hole saw from the outside w ith light pressure.
CAUTION: Using the hole saw from the inside is likely to damage the Gel Coat on the
underside of the base pan.
CAUTION: Heavy pressure on the hole saw from the inside is likely to damage the Gel Coat
and splinter the fiberglass.
Working from the outside at each pilot hole, use a 1-3/8” hole saw to make the holes for each
of the planned strain reliefs.
After holes are drilled, CAREFULLY use a file to clean the edges of the the holes.
Test fit the strain reliefs in each location, then, make adjustments as necessary. Do NOT
install strain reliefs at this time.