Sea Tel 9711-92, Installation And Operation Manual

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9711-92 Ku-Band TXRX Setup – Modem Connections, Setup and Test
12-5
4 Auto SAT load after SEARCH failure.
Enabling this function will cause the ACU to re-target the
calculated satellite position
(rather
than returning to origin).
2 Enable External Modem Lock Input (logic low = lock)
This enables the ACU to use the external modem input. Expected input is logic low (0 VDC) when
the modem has RX sync/Network Lock and a positive voltage (+15 VDC
max ) when the does not
have lock. This function must be enabled to use the external input from ANY modem,
regardless of its locked/unlocked logic. [If you find the AGC reading for locked and unlocked
conditions need to be reversed you must add 128 to your current SYSTEM TYPE parameter].
1 Auto SAT load on “hot” RESET and ACU Power-Up.
Enable this function if you want the ACU to automatically re-target the satellite whenever the
system power is turned ON (after antenna initialization) or whenever the operator presses the
RESET button on the from panel of the ACU.
To change the SYSTEM TYPE parameter, press the
LEFT
arrow key to bring the cursor under the least significant
character. Continue to move the cursor until the desired character to be edited is underscored (selected). Use the
UP
or
DOWN
arrow keys to increment or decrement the selected character. Use the
LEFT
or
RIGHT
arrow key to move
the cursor left or right to select other characters to modify. When you are finished modifying press
ENTER
to execute
the new value Continue pressing
ENTER
until SAVE NEW PARAMETERS is displayed, and then press the
RIGHT
arrow,
UP
arrow then
ENTER
to save the change(s).
12.8. Blockage Simulation Test - DAC-2202
Blockage output function is used to modify the behavior of Tracking and Searching when there is a known blockage
zone. The ACU provides a contact closure to ground on the SW2 terminal of the Terminal Mounting Strip when the
antenna is pointed within any one of the blockage/hazard zones or the system is searching, targeting, unwrapping or is
mis-pointed by 0.5 degrees or more (FCC TX Mute function for Transmit/Receive systems only). The contact closure is
a transistor switch with a current sinking capability of 0.5 Amp. This logic output control signal is used for:
•
When used as simple “BLOCKED” logic output for a single Sea Tel antenna, this output could be used to
light a remote LED and/or sound a buzzer to alert someone that the antenna is blocked, and signal is lost.
•
In a “Dual Antenna” installation, this logic output(s) is used to control Dual Antenna Arbitrator panel of
coax switches to switch the source inputs to the matrix switch from Antenna “A” to Antenna “B”, and
vice versa.
•
When used as simple “
RF Radiation Hazard
” logic output for a single Sea Tel TX/RX antenna, this
output could be used to suppress RF transmissions while the antenna is pointed where people would be
harmed by the transmitted microwave RF power output. The SW2 output would be interfaced to the
satellite modem to
disable the TX output signal from the Satellite TXRX Modem whenever the antenna
is within the RF Radiation Hazard zone(s).
•
When used for “ FCC TX Mute ” logic output for a single Sea Tel TX/RX antenna, this output could be
used to suppress RF transmissions whenever the antenna is mis-pointed 0.5 degrees or more, is blocked,
searching, targeting or unwrapping. The SW2 output would be interfaced to the satellite modem to
disable/mute
the TX output signal from the Satellite TX/RX Modem. When the mute condition is due
to antenna mis-pointing, it will not
un-mute
until the pointing error of the antenna is within 0.2 degrees.
The default output is contact closure to ground when the antenna is mis-pointed, therefore provides a
ground
to “Mute” the satellite modem on the SW2 terminal of the Terminal Mounting Strip. If your
satellite modem requires an
open
to “Mute”, refer to SYSTEM TYPE parameter 16 value to reverse the
output logic from the ACU.
12.8.1. Blockage Simulation Test - SW2 Trigger State: Logic Level LOW
1. Within the System Setup Parameters, Set System Type of the ACU to 0
(Do Not Save this Parameter
Setting)
.
2. Press the
NEXT
key until the Status main menu is displayed. (SEA TEL INC – Remote and antenna
software display).
3. Press the ENTER key one time to access the Tracking Control sub-menu.
4. Press the
RIGHT
arrow key four times to select tracking state editing mode.