Installation manual

6009-33 Installation Manual Installation
3-8
frequency to 0000. Normally, AGC readings below 2048 are considered a low condition
and indicate modem lock and AGC readings above 2048 are considered a high condition
and indicate modem unlock.
[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].
Turn tracking OFF when checking the external AGC inputs. Be sure to properly retune the receiver
frequency when you are finished testing the external input.
• Operation - In NORMAL operation, AGC must be above Threshold AND external MODEM
Lock input must be locked to Track the satellite. If you are tracking a satellite signal and the
AGC is above threshold (Tracking light on solid) but the external AGC signal rises above 2.5
volts for more than 20 seconds (external MODEM input UNLOCKED) the ACU will
automatically retarget the selected satellite.
SW1 - Band Selection control output. This output is used to control below decks tone
generator(s), or coax switch(s), for band selection functions. The band selection control output is
driven by the band selected in the MODE – TRACKING display.
SW2 - The Blockage/TX Mute Control output is driven
by Blockage and RF Radiation Hazard functions. This
output will short to ground whenever the antenna is within
the programmed AZ LIMIT zone(s) or is Searching,
Targeting or is mispointed 0.5 degrees from satellite peak.
This output is commonly used to drive:
If your modem cannot use the Modem Console
Port connection you will have to provide a transmit
inhibit output from the ACU by connecting a SW2
wire connection to the modem to comply with FCC
Order 04-286 and WRC-03 Resolution 902.
• Dual or Quad Antenna Arbitrator coax switches in
dual antenna configurations. The coax switches
select which antenna is feeding signal to the
below decks equipment.
• Mute the Transmit output of the Satellite Modem
used in TX/RX antenna configurations when the
antenna is positioned where people may be
harmed by the transmit power emanating from
the antenna (RF Radiation Hazard).
• Mute the Transmit output of the Satellite Modem
used in TX/RX antenna configurations when the
antenna is mispointed by 0.5 degrees, or more,
and keep it muted until the antenna has been
within 0.2 degrees of peak pointing to the satellite
for a minimum of 5 seconds (FCC part 25.221 & 25.222 TX Mute requirement).
3.6.7.4. TS2 Synchro Gyro Compass Input.
Use the R1, R2, S1,S2 and S3 screw terminals to connect the Synchro Gyro Compass to the ACU.
3.6.7.5. TS3 Step-By-Step (SBS) Gyrocompass Input.
Use the COM, A, B and C screw terminals to connect the SBS Gyrocompass to the ACU. Some SBS
Gyro distribution boxes have terminals which are labeled S1, S2 & S3 instead of A, B and C.
3.6.7.6. TS4 Power
• VREG Screw terminal is used to provide a regulated DC operating voltage to ancillary
equipment. Voltage out is dependant upon which terminal mounting strip assembly is
provided. 126865-1 supplies 8Vdc @ 1Amp, while the 126865-2 assembly supplies 5Vdc
@ 2Amps.
• GND Screw terminal is the ground reference for the regulated and unregulated power
terminals.