Sea Tel ST14, Installation And Maintenance Manual

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Setup for Model ST14 D ST14 Ku-Band TVRO
2-10
system will use the parameter entered for MID LAT OFFSET for calculating the tracking
threshold.
2.3.11.5.3.
The HIGH LAT LIM parameter defines the
“Upper” Latitude Limitation Range and is any
whole degree from1-90. The HIGH LAT LIM
parameter sets the lowest latitude position of
the Upper latitude range. Therefore the upper
latitude range will be any latitude range from
HIGH LAT LIM to 90°. Example: To define an
upper Latitude Range of 45° to 90°, enter a HIGH
LAT LIM of 45. While in this range the system
will use the parameter entered for HIGH LAT
OFFSET for calculating the tracking threshold.
Upper Latitude Range
2.3.11.6. LOW/MID/HI LAT OFFSET (Threshold Offset)
The threshold-offset parameters are an AGC value from 0-255 that is summed to the average noise
floor, to properly calculate the systems tracking signal threshold every time the system is
commanded to Target or Search for a desired satellite.
Example: If the Averaged noise floor is 1100 AGC counts and the Threshold Offset value is 40, the
resultant AGC threshold would be set to 1140 counts, thereby triggering the Tracking status for any
AGC value1141 or higher.
Figure 2-4 Threshold Offset Regions
2.3.11.6.1.
The LOW LAT OFFS parameter defines what threshold offset value parameter is used when
the vessel is located within the Lower Latitude Range.
LOW LAT OFFSET
1. Press the NEXT key to select this sub-menu parameter for adjustment.
2. A cursor will appear under the rightmost digit. Press
▼
&
▲
arrow keys to
increment/decrement this digit.
3. Press the
NEXT
key to move the cursor to the next digit to the left. Press
▼
&
▲
arrow keys to increment/decrement this digit.
4. Press the
NEXT
key to move the cursor to the next digit to the left. Press
▼
&
▲
arrow keys to increment/decrement this digit.
5. Press the
SAVE
key to save this parameter to memory.
2.3.11.6.2.
The MID LAT OFFS parameter defines what threshold offset value parameter is used when
the vessel is located within the Middle Latitude Range.
MID LAT OFFSET
1. Press the
NEXT
key to select this sub-menu parameter for adjustment.
2. A cursor will appear under the rightmost digit. Press ▼ & ▲ arrow keys to
increment/decrement this digit.
3. Press the
NEXT
key to move the cursor to the next digit to the left. Press
▼
&
▲
arrow keys to increment/decrement this digit.
Figure 2-3 Upper Latitude Range