General Dynamics 1890 Series User manual

4096-693
May 31, 2016
Revision C
ASSEMBLY MANUAL
Small Aperture Rx/Tx Antenna Systems
Series 1890, 1920, 1100, and 1120
General Dynamics SATCOM Technologies
1700 Cable Drive NE
Conover NC 28613 USA
Phone [phone]
www.gdsatcom.com

4096-693 Small Aperture Rx/Tx Antennas
General Dynamics SATCOM Technologies Series 1890, 1920, 1100, & 1120
2
Small Aperture Rx/Tx Antenna Systems
Series 1890, 1920, 1100, and 1120
C Add Conover Address 5/31/16 RAH
B Revised Company Name and Logo 5/28/09 RAH
A General Revision 5-18-07 R Frye
- ORIGINAL RELEASE 04/28/05 R Frye
REV. DESCRIPTION DATE APPROVED

4096-693 Small Aperture Rx/Tx Antennas
General Dynamics SATCOM Technologies Series 1890, 1920, 1100, & 1120
3
TABLE OF CONTENTS
SECTION TITLE
I INTRODUCTION
1.0 General Information
1.1 Unpacking & Inspection
1.2 Freight Damage
1.3 Material Missing or Damaged
1.4 Mechanical Installation Tools
1.5 Torque Values
1.6 Suggested Foundation
II ANTENNA ASSEMBLY
2.0 Antenna Assembly Overview
2.1 Mount And Reflector Assembly
2.2 Feed Assembly
III SATELLITE ALIGNMENT
3.0 Satellite Alignment
IV MAINTENANCE
4.0 Maintenance Overview
4.1 Periodic Inspection

4096-693 Small Aperture Rx/Tx Antennas
General Dynamics SATCOM Technologies Series 1890, 1920, 1100, & 1120
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SECTION I INTRODUCTION
1.0 GENERAL INFORMATION
This manual describes the assembly and installation of General Dynamics' small
aperture antenna mount. The General Dynamics small aperture system is a
rugged and reliable antenna system which operates at ku-band frequencies with
high efficiency.
These instructions are listed by sections that cover all areas of assembly and
installation. Additional sections are included in the manual to provide information
on antenna alignment to satellite and maintenance.
1.1 UNPACKING AND INSPECTION
The antenna containers should be unpacked and inspected at the earliest date to
insure that all material has been received and is in good condition.
1.2 FREIGHT DAMAGE
Any damage to materials while in transit should be immediately directed to the
freight carrier. He will instruct you on matters regarding any freight damage
claims.
1.3 MATERIAL - MISSING OR DAMAGED
Any questions regarding missing or damaged materials that is not due to the
freight carrier should be directed to General Dynamics' Customer Service
Department at:
General Dynamics SATCOM Technologies
1700 Cable Drive NE
Conover NC 28613 USA
Phone [phone]
www.gdsatcom.com

4096-693 Small Aperture Rx/Tx Antennas
General Dynamics SATCOM Technologies Series 1890, 1920, 1100, & 1120
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1.4 MECHANICAL INSTALLATION TOOLS
The following tools are suggested for the antenna installation.
1 Ratchet (3/8" drive) 1 Torque wrench
1 Socket 7/16" (3/8" drive) 1 Compass
1 Socket ½" (3/8"drive) 1 Inclinometer
1 Wrench combination - 7/16" 1 Magnetic level
1 Wrench combination - ½"
1.5 TORQUE VALUES
The following torque values should be used during assembly.
HARDWARE SIZE TORQUE.
1/4" FEED SYSTEM HARDWARE 6 ft/lb
5/16" Az/El CAP HARDWARE 12 ft/lb
BACK REFLECTOR SCREWS 10 ft/lb (89cm, 92cm, 1.0M)
15 ft/lb (1.2M)
NOTE: If reflector screws must be removed after initial install, it is important that they
are reinstalled in the original thread paths in the reflector.
NOTE: The Minimum Torque applied should not be less than 10% of maximum
recommended torque.

4096-693 Small Aperture Rx/Tx Antennas
General Dynamics SATCOM Technologies Series 1890, 1920, 1100, & 1120
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1.6 SUGGESTED FOUNDATION
All local building codes should be adhered to, i.e. grounding, foundation
requirements, zoning rules, setbacks, etc. The following is a suggested
foundation only.
Notes:
1. 2.0” SCHEDULE 40 PIPE SHOULD CONFORM WITH ASTM A36 STRUCTURAL STEEL.
2. ALL CONCRETE SHOULD CONFORM TO BUILDING CODE STANDARDS AND HAVE A
MINIMUM COMPRESSIVE STRENGTH OF 3000 PSI AT 28 DAYS. (PER ACI-318-77)
3. SOIL BEARING CAPACITY SHOULD BE NO LESS THAN 200 PSF.
4. CONCRETE SHOULD BE POURED AGAINST UNDISTURBED SOIL.
5. ALLOW CONCRETE 24 HOUR SET TIME BEFORE INSTALLATION OF ANTENNA.
6. THE ANTENNA SHOULD BE PROPERLY GROUNDED TO MEET APPLICABLE LOCAL CODES.
7. MINIMUM DEPTH AS SHOWN OR EXTENDED TO LOCAL FROST LINE.
(GENERAL DYNAMICS DOES NOT REPRESENT OR WARRANT THAT ANY PARTICULAR DESIGN
OR SIZE OF FOUNDATION IS APPROPRIATE FOR ANY LOCALITY OR EARTH STATION
INSTALLATION)
B
MIN.
A
DIA.
45
C
SEE NOTE 7
A
A
2.0SCH 40 PIPE
( 2.38” O.D. )
A
B
C
89cm/92cm 1.0M/1.2M
12.0”
24.0”
24.0”
16.0”
30.0”
30.0”
SECTION A - A

4096-693 Small Aperture Rx/Tx Antennas
General Dynamics SATCOM Technologies Series 1890, 1920, 1100, & 1120
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SECTION II ANTENNA ASSEMBLY
2.0 ANTENNA ASSEMBLY OVERVIEW
The small aperture mount is designed to support General Dynamics' 89cm thru
1.2m antennas. Refer to the figures and parts list and follow the instructions in
the listed sequence.
2.1 MOUNT AND REFLECTOR ASSEMBLY
REFLECTOR AND MOUNT PARTS LIST
ITEM PART NO. DESCRIPTION QTY
1Varies
89cm REFLECTOR or
92cm REFLECTOR or
1.0M REFLECTOR or
1.2M REFLECTOR
1
1
1
1
20185-577
or
0185-599
Az/El CAP ASSEMBLY (89cm, 92cm, 1.0m)
Or
Az/El CAP ASSEMBLY (1.2m)
1
1
38319-005
or
8319-006
SCREW, Hi-Lo THD 11/32 x 1.125 (89cm, 92cm, 1.0m)
Or
SCREW, Hi-Lo THD 27/64 x 1.375 (1.2m)
4
4

4096-693 Small Aperture Rx/Tx Antennas
General Dynamics SATCOM Technologies Series 1890, 1920, 1100, & 1120
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STEP 1: Attach the reflector to the Az/El Cap with four hi-lo screws (item# 3). Note:
The bottom of the reflector has a hole for the feed rod, the top does not.
Tighten the four screws to 10 ft/lbs for the .89/92/1.0M antennas.
Tighten the four screws to 15 ft/lbs for the 1.2M antenna.
See figure 5.
STEP 2: Place the Az/El Cap/reflector assembly over the mast pipe and secure by
tightening the two 5/16" nuts on the canister, snug, but not tight enough to
prevent Azimuth rotation.
FIGURE 5.
Az / El Cap
89cm/92cm/1.0M
Torque hi/lo screws to
10 ft/lbs
1.2M
Torque hi/lo screws to
15 ft/lbs

4096-693 Small Aperture Rx/Tx Antennas
General Dynamics SATCOM Technologies Series 1890, 1920, 1100, & 1120
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2.2 FEED ASSEMBLY
Refer to the installation instructions supplied with your antenna system for feed
support and feed installation details.
SECTION III SATELLITE ALIGNMENT
3.0 SATELLITE ALIGNMENT
After installation of the feed and feed support, the antenna assembly is complete
and the antenna is ready to be aligned to the selected satellite.
STEP 1:
STEP 2:
Elevation adjustment
Bolt
Elevation Indicator
Elevation Pivot
Bolt
Canister Mounting
Bolts
A) Refer to the elevation scale located on
the side of the Az/El positioner as
shown. To set the antenna system to
the correct elevation angle, loosen the
elevation pivot hardware on both sides
of the mount just enough to unlock the
lockwashers. Then turn the elevation
adjustment screw.
Note: the scale has a 22.5 degree
offset angle built in to it. Therefore,
when the elevation angle is read on
the scale, the 22.5 degree offset in the
reflector has been accounted for.
S
AZIMUTH
A) After making the cable connections to
the electronics, rotate the antenna in
azimuth to the correct azimuth heading
using a compass to determine
direction.
Sweep the antenna slowly in azimuth
until a signal is found.
B) If the desired signal is not found, it may
be necessary to alter the elevation
angle slightly, and then repeat the
above procedure.

4096-693 Small Aperture Rx/Tx Antennas
General Dynamics SATCOM Technologies Series 1890, 1920, 1100, & 1120
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STEP 3:
After the satellite is located, peak the signal by making small, incremental adjustments
in both elevation and azimuth. After peak signal is found, tighten all hardware used for
adjustment.
SECTION IV MAINTENANCE
4.0 MAINTENANCE OVERVIEW
After installation, the antenna requires only periodic inspection. It is anticipated
that maintenance, if required, will be minimal and easily handled by a local or in-
house maintenance staff. The materials used in the construction of this Earth
Station Antenna virtually eliminate any maintenance repairs.
4.1 PERIODIC INSPECTION
It is suggested that a periodic inspection be performed at least every six months.
NOTE: After any severe weather conditions, inspection of the antenna should be
performed to determine if foreign objects have caused damage or if survival
specifications have been exceeded.
This inspection should include the following:
STEP 1: Check all bolting locations - all bolts should be tight.
STEP 2: Check all structural members - repair or replace if damaged.
STEP 3: Check the foundation anchor bolts (if applicable) - they must be
secure and no failure signs in foundation.
STEP 4: Check for corrosion - on the reflector structure and the mount.