COBHAM SEA TEL 9711IMA-70, Installation Manual

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Setup – Blockage & RF Radiation Hazard Zones 9711IMA-70
8-2
ZONE 1 named “Fwd Deckhouse” begins (REL Start) at
334 degrees Relative and ends (REL Stop) at 026
degrees Relative. Enter REL Start value of 334.0 and
REL Stop value of 26.0. In this case the mast height
only causes blockage up to an elevation of 40 degrees,
so we set EL to 40.0. If the antenna is between these
two AZ Limit points but not in the “mast” zone AND the
elevation is greater than 40 degrees, the antenna will
no longer be blocked.
ZONE 2 named “Mast” begins (REL Start) at 352
degrees Relative and ends (REL Stop) at 008 degrees
Relative. Enter REL Start value of 352.0 and REL
Stop value of 8.0. In this case the mast height only causes blockage up to an elevation of 70 degrees, so
we set EL to 70.0. If the antenna is between these two AZ Limit points but the elevation is greater than
70 degrees, the antenna will no longer be blocked.
ZONE 3 named “Aft Deckhouse” begins (REL Start) at 155 degrees Relative and ends (REL Stop) at 205
degrees Relative. Enter REL Start value of 155.0 and REL Stop value of 205.0. In this case the aft
deckhouse height only causes blockage up to an elevation of 30 degrees, so we set EL to 30.0. If the
antenna is between these two AZ Limit points but the elevation is greater than 30 degrees, the antenna
will no longer be blocked.
ZONE 4 named “Stack” begins (REL Start) at 173 degrees Relative and ends (REL Stop) at 187 degrees
Relative. Enter REL Start value of 173.0 and REL Stop value of 187.0. In this case the stack height only
causes blockage up to an elevation of 55 degrees, so we set EL to 55.0. If the antenna is between these
two AZ Limit points but the elevation is greater than 40 degrees, the antenna will no longer be blocked.
8.2. Programming Instructions:
1. To set up the blockage zones go to the
System Configuration screen.
2. Enter a readily identifiable name for the
zone (ie Mast, Deck House or Stack).
3. Moving to the right, enter the relative of
the starting point of this blockage zone
(the more counter-clockwise bearing).
4. Then enter the relative bearing of the
stop point of this blockage zone (the
more clockwise of the two bearings).
EAR Controlled - ECCN EAR99