Channel Master 243 User manual

Type 243
2.4m Offset Tx/Rx Antenna System
Instruction and Assembly Manual
Printed in U.S.A. 12/98 8000450-02
Premier Business Park, Crofthead Road,
Off Philips Road, Whitebirk Industrial Estate
Blackburn, Lancashire England BB1 5UE
[phone] ■ Fax [phone]
1315 Industrial Park Drive, P.O.Box 1416
Smithfield, N.C. 27577 U.S.A.
Fax [phone]
Phone [phone] (Customer Service)
(UK) Limited
EXCEPTION TO CHART ABOVE:
⁵⁄₈”x5¹⁄₂” Round Head Square Neck Bolt (Item #2), securing antenna to mount.
Torque to 35 Ft-lbs (47 N-m).
¹⁄₂”x1¹⁄₂” Hex Head Bolt, securing antenna halves.Torque to 35 Ft-lbs (47 N-m).
BOLT TORQUE
GRADE 5 GRADE 2
⁵⁄₁₆ IN. ³⁄₈ IN. ¹⁄₂ IN. ⁵⁄₈ IN. ³⁄₄ IN. ⁷⁄₈ IN. 10 ¹⁄₄ IN. ⁵⁄₁₆ IN. ³⁄₈ IN. ¹⁄₂ IN. ⁵⁄₈ IN. ³⁄₄ IN. ⁷⁄₈ IN.
18 31 75 150 250 350 32 6 11 20 43 92 124 175
FT-LBS FT-LBS FT-LBS FT-LBS FT-LBS FT-LBS FT-LBS FT-LBS FT-LBS FT-LBS FT-LBS FT-LBS FT-LBS FT-LBS
24 42 102 203 339 474 3.6 8 15 27 58 125 168 237
N-m N-m N-m N-m N-m N-m N-m N-m N-m N-m N-m N-m N-m N-m
GRADE 5
APPLY 18 FT-LBS (24 N-m)
OF TORQUE TO ⁵⁄₁₆ BOLT
EXAMPLES: GRADE 2
APPLY 11 FT-LBS (15 N-m)
OF TORQUE TO ⁵⁄₁₆ BOLT
SITE SELECTION
The first and most important consideration when
choosing a prospective antenna site is whether or
not the area can provide an acceptable “look angle” at
the satellites. A site with a clear, unobstructed view
is preferred. Also consider obstruction that may occur
in the future such as the growth of trees.Your antenna
site must be selected in advance so that you will be
able to receive the strongest signal available.To avoid
obstructions, etc., conduct an on-site survey with a
portable antenna.
As with any other type of construction, a local building
permit may be required before installing an antenna.It
is the property owner’s responsibility to obtain any and
all permits.
Before any digging is done, information regarding the
possibility of underground telephone lines, power
lines, storm drains, etc., in the excavation area should
be obtained from the appropriate agency.
Because soils vary widely in composition and load
capacity, consult a local professional engineer to
determine the appropriate foundation design and
installation procedure. A suggested foundation design
with conditions noted is included in this manual for
reference purposes only (see page 4).To assist in the
foundation design, refer to “Outline Drawing” in the
Appendix “A” on page 16.
ASSEMBLY TOOLS REQUIRED
■■Grounding Rod Clamp & Grounding Block: As required by
National Electric Code or local codes.
■■Ground Wire: As required by National Electric Code or local
codes (length required).
■■Coaxial Cable: Size and length required.
■■Concrete: See “Ground Pole” section for quantity.
■■#3 Rebar: See “Ground Pole” section for quantity.
Deformed steel per ASTM A615, Grade 40 or 60.
PREINSTALLATION CHECKLIST
1 - Compass
1 - Clinometer
1 - 9” Magnetic Bubble Level
1 - Torque Wrench
(Capacity 4 Ft-lbs - 175 Ft-lbs)
1 - ¹⁵⁄₁₆” Deep Socket (¹⁄₂”Drive)
1 - 1 ⁵⁄₁₆” Deep Socket (¹⁄₂”Drive)
1 - ³⁄₄” Socket (¹⁄₂”Drive)
1 - Ratchet Wrench (¹⁄₂”Drive)
1 - ⁷⁄₁₆” Nutdriver
1 - ⁷⁄₁₆” Box/Open End Wrench
1 - 1¹⁄₈” Open End Wrench
1 - 12” Crescent Wrench (Adjustable)
1 - ⁷⁄₁₆” Socket (For Torque Wrench)

GROUND POLE INSTALLATION - 6⁵⁄₈”O.D.
EXPOSURE “C” EXPOSURE “C”
WIND CONC CONC
ANT VEL DIM VOL DIM VOL GROUND
SIZE (MPH) “d” (CUYD) “d” (CU YD) POLE
2.4m 100 44” 1.7 37” 1.6 “A”
SMC
OFFSET 125 53” 2.4 45.25” 2.6 “B”
POLE SPECIFICATIONS:
Ground Pole “A” = 6.62 OD SCH 40 (6.06 I.D.) Steel
Ground Pole “B” = 6.62 OD SCH 80 (5.76 I.D.) Steel
NOTE:
1. Poles “A” and “B” are not supplied (purchased locally to ASTM A501) and must be field drilled ⁵⁄₈ Dia.for #3 rebar, drilled .218 for ¹⁄₄-
20 self tapping grounding screw and galvanized or painted for protection.
2. Pole and foundation design based on the following criteria:
a. Uniform building code Exposure C and 1.5 stability factor.
b. Vertical soil pressure of 2000 pounds per square foot.
c. Lateral soil pressure of 300 pounds per square foot.
d. Concrete compressive strength of 2500 pounds per square inch in 28 days.
CAUTION: The foundation design shown does not represent an appropriate design for any specific locality, since soil conditions vary
and may not meet design criteria given in Note 2.You should consult a local professional engineer to determine your soil conditions and
appropriate foundation.
,,,
,,,
,,,
,,
,,
,,
108"
63.5" 69.5"
d
50"
1" to 2"
SLOPE FOR
WATER RUN-OFF
GRADE
#3 REBAR X DIA. OF PIER,
INSERTTHRU HOLE IN
TUBE & CENTER BELOW
FROST LINE
MIN.
DIA.
6⁵⁄₈" O.D.
,,
,,
,,
,,
,,
,,
,
,
,
,,
,,
,,
,,,
,,,
,,,
108"
63.5"
d
66"
1" to 2"
SLOPE FOR
WATER RUN-OFF
GRADE
#3 REBAR x 18"
INSERTTHRU HOLE IN
TUBE & CENTER
BELOW
FROST LINE
MIN.
DIA.
6⁵⁄₈" O.D.
,,
,,
,,
,,
,,
(SEE NOTE)
2"
APPROX.
2"
,,
,,
(6) #3 x 24" MIN.
AT 60˚ APART
(SEE NOTE)
ANT
C
L
NOTE:
66" may be
increased,
concrete and
length of rebar
will increase
accordingly.
DEEP FROST LINE FOUNDATIONSPIER FOUNDATIONS
GROUND POLE
MUST BE
LEVEL IN ALL
DIRECTIONS
BUBBLE
LEVEL
ASSEMBLY
FIGURE - 1.0
TOP
BOTTOM
REFLECTOR ASSEMBLY
1 - Place reflector halves on a flat surface, face
down. (Ref.Figure 1.0).Install ¹⁄₂”x1¹⁄₂”hex bolts with
flat washer into the two outer bolt holes at reflector
rim. Secure with ¹⁄₂” flat washer, lock washer and hex
nut as shown in Figure 1.1. Repeat on opposite side
of reflector. Leave loose.
2 - Install remaining seam bolts, working toward center
of reflector as noted above. Repeat on opposite side
of reflector. Leave finger tight. (Ref.Figure 1.2)
NOTE: All seam bolts to be finger tight only.
MOUNT AND BACKFRAME ASSEMBLY
3 - Place yoke cap assembly onto ground pole, and
loosen two ¹⁄₂” carriage bolts (16) securing R.H.channel
to yoke cap (non-welded). Reference Figure 1.3.
4 - Install backframe (1) onto yoke cap assembly and
secure with ⁷⁄₈” x 6” hex bolt, lock washer and hex nut
(24, 15 & 14). Do not tighten. Remove two ¹⁄₂” bolts
from Trunnion, swing backframe down and secure
elevation screw and trunnion (25 & 26) to AZ/EL cap
with ¹⁄₂”x1¹⁄₄” hex bolt and lock washer (17 & 3).
Leave loose. Reference Figure 1.3.
5 - Loosen ⁷⁄₈” elevation nuts (14) on elevation screw
(25) and run up to place backframe in birdbath position
(see Figures 1.3 & 1.4).
FIGURE - 1.1
45
45
44
3
4
¹⁄₂ FLAT WASHER
¹⁄₂ LOCK WASHER
¹⁄₂ FLAT WASHER
¹⁄₂ x 1-1¹⁄₂
HEX BOLT
(6 PLCS -
BOTH SIDES)
¹⁄₂ HEX NUT
FIGURE - 1.2 FIGURE - 1.3
GROUND
POLE
BACK
FRAME
YOKE
CAP
ASSEMBLY
17
3
24
15
14
1
25 26 17
3
26
14
16
14
14

FIGURE 1.5
.025 MAX MISMATCH
HORIZONTAL
SEAM
PARABOLIC
PREFERRED
SEAM
MATCH
ACCEPTABLE
SEAM
MATCH
2ND CREDIT CARD
OR FEELER GAGE
.028 THICKNESS
WON'T GO
CREDIT
CARD
CREDIT
CARD
CREDIT
CARD
HORIZONTAL
SEAM
HORIZONTAL
SEAM
ANTENNA INSTALLATION
6 -Insert four ⁵⁄₈”x5¹⁄₂”round head square neck bolts
(2) into reflector assembly (5) and affix on to back-
frame.Reflector section marked “TOP” must be located
at the top end of backframe. Make sure round head
square neck bolts are seated correctly before securing
reflector to backframe. Secure reflector to backframe
with ⁵⁄₈” lock washers and hex nuts. Leave these
bolts loose. Reference Figure 1.4.
SEAM ALIGNMENT
7 - Lower reflector to vertical position by running
down two elevation nuts (14).
8 - Check the horizontal seam match as shown in
Figure 1.5. If alignment is required, begin at the outer
rim by pushing or pulling on the bottom reflector rim,
while another tightens their seam bolts at this loca-
tion. Continue this process, working toward the cen-
ter, and alternating from one side to the other.
9 - After all seam bolts are tightened, torque bolts,
using the same sequences as above, to 35 ft-lbs. Now
tighten and torque (4) reflector mounting bolts to 35 ft-lbs.
NOTE: Certain models reuqire additional alignment
instructions. Refer to supplement for detailed instruc-
tions.
FEED SUPPORT TUBE INSTALLATION
10 - Install ¹⁄₄”x1¹⁄₂” hex bolt with flat wahser (46 &
7) into bottom hole in reflector and secure with ¹⁄₄” flat
washer and hex nut (7 & 6). Reference Figure 1.6
11 - Install feed support tube (10) onto backframe
and secure with two ¹⁄₂”x5¹⁄₂” hex bolts, four external
tooth lock washers and hex nuts (12, 11 & 4).
Reference Figure 1.7.
IMPORTANT: ¹⁄₄”x1¹⁄₂” hex gage bolt (Item 46) in
bottom of reflector fits into hole on top of support
tube end (Item 10). Reference Figure 1.7.
FIGURE - 1.4
2
5
41
42
(4 PLACES)
"TOP"
FIGURE - 1.6
15
7
6
NOTE: ¹⁄₂” external tooth washers (11) must be
assembled on bolts, with one under head of bolts
and one under hex nuts (4), refer to Figure 1.7.
Leave these bolts loose.
12 - Install left and right side struts onto reflector as
shown in Figure 1.8.
Attach long formed end of side struts (27) to
reflector rim by inserting ¹⁄₄”x³⁄₄” hex head bolt (28)
through inside of reflector rim and secure snug, but
free to pivot with ¹⁄₄” lock washer and hex nut (6 & 8).
Attach short formed end of side struts (27) to feed
support tube with ¹⁄₄”x³⁄₄” hex bolt, lock wahesr and
hex nut (28, 8 & 6). Tighten and torque hardware
securing side struts to feed support tube only to 6 Ft-
lbs (8 N-m).
13 - Without using excessive pressure, lift feed
support tube vertically just enough to relieve load off
side struts and bottom rim gage bolt (Item 46). While
another person tightens and torque’s ¹⁄₂” hex head
bolts (*) securing feed supprot tube to backframe to
35 Ft-lbs (47 N-m). Tighten and torque ¹⁄₄” hex head
bolts (**) securing side struts to reflector to 4 Ft-lbs
(5.4 N-m). Reference Figure 1.9.
14 - To install ODU or Feeds, see instructions
supplied with these kits.
FIGURE - 1.7
~
~
HOLE
FEED
SUPPORT
TUBE
6
7
7
46
10
1
12
11
11
4
10
FIGURE - 1.8 FIGURE - 1.9
28
27
8
6
28
10
**
*
86
SHORT FORMED END
OF SIDE STRUTS
ATTACHES TO ORU
SUPPORT TUBE.
LONG FORMED END
OF SIDE STRUTS
ATTACHES TO
ANTENNA.
FEED SUPPORT
TUBE
LIFT UP ON ODU
SUPPORT TUBE HERE,
WHILE ANOTHER PERSON
TIGHTENS AND TORQUES
HARDWARE (* & **).
*TORQUETO 35 FT-LBS (47 Nm)
**TORQUETO 4 FT-LBS (5.4 Nm)

FIGURE - 2.0
GROUND POLE
GROUND LUG
GROUND WIRE (Typical #10 AWG Copper, #8 Aluminum)
Refer to NEC Section 810 and local electric
codes for the specific area requirements.
1/4" - 20 UNC x 5/8" HEX HEAD,
TYPE "D" POINT, SELF TAPPING SCREW
Apply sealant here, after assembly,
to improve corrosion resistance
DRILL HOLE THRU ONE WALL WITH
7/32" DIA.TWIST DRILL
1/4" EXTERNAL TOOTH
LOCK WASHER
REF.10" - 12"
GROUNDING
TYPICAL ELECTRICAL GROUNDING FOR ANTENNA GROUND POLE
NOTE: ALL INSTALLATIONS TO CONFORM TO THE LATEST ISSUE OF THE NATIONAL ELECTRIC CODE
*COAXIAL CABLE
FROM LNB
*COAXIAL CABLE
TO RECEIVER
*GROUND BLOCK
NEC SECTION
810-20
*GROUNDWIRE
NEC SECTION
810-20
*ITEMS NOT SUPPLIED
NOTE: All installations to conform to latest issue of
National Electrical Code.
Ground antenna mount assembly and feed cables in
accordance with current National Electrical Code and
local electrical codes. Figure 2.0 and 2.1 illustrates
typical grounding methods for the ground pole and
feed cables.
Clamps that provide a solid connection between
ground wire and ground source should be used.
Tighten and torque all hardware.
FIGURE - 2.1
NOTE:
ALL INSTALLATIONS TO
CONFORM TO THE LATEST
ISSUE OF THE NATIONAL
ELECTRIC CODE
ANTENNA ALIGNMENT PROCEDURE
Alignment with the satellite is obtained by setting polar-
ization, elevation and azimuth. Charts 1, 2 & 3 are to
determine the values for your earth station antenna site.
“∆L” is the difference between the earth station antenna
site longitude and the satellite longitude. Use “∆L” and
your earth station latitude to obtain polarization, eleva-
tion or azimuth setting.
POLARIZATION OF FEED
Loosen feed horn clamp bolts and turn feed clockwise
or counterclockwise, depending on being east or west
of the satellite as shown on Chart 1. Align marks on the
horn clamp and appropriate mark on the horn scale.
Polarization chart assumes antenna system polariza-
tion is Tx vertical and satellite vertical Pol is perpendic-
ular to plane of geostationary arc. For horizontal Tx of
antenna, feed must be rotated 90˚ from values shown.
(Starting point for polarization adjustment is 0˚, as
shown in Figure 3.0).
ELEVATION ALIGNMENT
Use Chart 2 and determine your elevation setting.
Using a clinometer, adjust the elevation by turning the
elevation screw adjusting nuts until the desired eleva-
tion is obtained. Reference 3.1. NOTE: Degree values
shown on the clinometer are mechanical; that is
when the reflector face is vertical, mechanical
elevation is 90˚ or axis is 0˚,while the beam elevation
(signal) axis is 22.62˚. Therefore, as the reflector is
tilted, remember to compensate for the 22.62˚ offset
angle to get the correct beam elevation. (See
Appendix A, Outline Drawing, Page 17). This is an
approximate setting. Optimum setting will be
achieved during the fine tuning.
AZIMUTH
Use Chart 3 and determine your azimuth setting.
Values in chart must be adjusted for magnetic devi-
ation for your location for correct compass reading.
Equally tighten the six azimuth locking bolts until snug.
This will allow the reflector to rotate with slight
resistance (Ref. Fig. 3.2.)
Rotate reflector and mount, pointing to the compass
reading for your location (Ref. Fig. 3.3.)
Slowly sweep the reflector in azimuth until signal is
found. If desired signal is not found, increase or
decrease elevation setting and repeat the azimuth
sweep. Tighten locking bolts.
+40-40 0
HORN SCALE
ALIGNMENT MARK
CLAMP BOLT
FIGURE - 3.0
PIVOT
BOLT
(LOOSEN)
ELEVATION
BOLT
(LOOSEN)
ELEVATION
ADJUSTING
SCREW
TRUNNION
CLINOMETER
RIB
ELEVATION
HEX NUTS
FIGURE - 3.1

AZIMUTH
171˚
ROTATE ANTENNA ON
GROUNDTUBE
EXAMPLE:
AZIMUTH HEADINGTO 171˚
(AZIMUTH ±MAGNETIC DEVIATION)
COMPASS
S
SW
W
NW
N
NE
E
SE
170
180
190
FIGURE - 3.3
FINE TUNING
Progressively tighten and torque azimuth locking bolts
to 85-95 Ft-lbs. The four top plate locking bolts are
factory torqued to 10-11 Ft-lbs., maintain this torque
until after azimuth is fine tuned.
Use a signal strength measuring device for final adjust-
ments to obtain maximum antenna performance.
Alternate between elevation and azimuth fine tuning to
reach maximum signal strength, until no improvement
can be detected. Gradually tighten (¹⁄₈ turn increments
max.) top plate bolts in sequence 1, 3, 4 and 2 to 75 Ft-lbs.,
refer to Figure 3.2. Observe for maximum signal
strength as elevation screw’s locking nuts are tighten.
Polarization tune may be checked by carefully and
slowly rotating feed assembly in clamp.When maximum
signal strength is found, gradually tighten clamp bolts
(Fig.3.0).If a signal on the opposite polarity is available,
this signal should be minimized.
Tighten and torque all hardware. Refer to Torque Chart
on Page 3.
1
2
3
4
TOP PLATE
LOCKING BOLT
(4 PLCS)
AZIMUTH
ADJUSTING
SCREW
AZIMUTH
LOCKING
BOLTS
(6 PLCS)
TOP PLATE
PIVOT BOLT
TURN NUTS
CLOCKWISE OR
COUNTERCLOCKWISE
FOR AZIMUTH
FINETUNING
FIGURE - 3.2
0 1020304050607080
0
20
40
60
80
10
30
50
70
90
ANTENNA
FEED
FEED
ANTENNA
+ POLARIZATION WHEN EARTH STATION IS WEST OF SATELLITE
– POLARIZATION WHEN EARTH STATION IS EAST OF SATELLITE
EARTH STATION LATITUDE IN DEGREES NORTH OR SOUTH OF EQUATOR
POLARIZATION + OR – (SEE ILLUSTRATION)
" L" ISTHE DIFFERENCE BETWEENTHE EARTH STATION
ANTENNA SITE LONGITUDE ANDTHE SATELLITE LONGITUDE
POLARIZATION CHART
FEED POLARIZATION
FACING ANTENNA
CCW +
CW –
NORTHERN HEMISPHERE
FEED POLARIZATION
FACING ANTENNA
CCW +
CW –
SOUTHERN HEMISPHERE
+–
+–
CHART 1
75°
60°
40°
30°
20°
15°
10°
5°

90 80 70 60 50 40 30 20 10
0 1020304050607080
0
EARTH STATION LATITUDE IN DEGREES NORTH OR SOUTH OF EQUATOR
ELEVATION IN DEGREES
" L" ISTHE DIFFERENCE BETWEENTHE EARTH STATION
ANTENNA SITE LONGITUDE ANDTHE SATELLITE LONGITUDE
ELEVATION CHART
CHART 2
5°
10°
15°
20° 25° 30° 35° 40° 45° 50° 55° 60° 65° 70° 75°
50°
125°
120°
115°
110°
105°
100°
95°
90°
85°
80°
75°
70°
65°
50°
47.5°
45°
42.5°
40°
37.5°
35°
32.5°
30°
27.5°
25°
47.5°
45°
42.5°
40°
37.5°
35°
32.5°
30°
27.5°
25°
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80
180
190
200
210
220
230
240
250
260
270
180
170
160
150
140
130
120
110
90
270
[AZIMUTH COLUMN READINGWHEN EARTH STATION IS WEST OF SATELLITE]
[AZIMUTH COLUMN READINGWHEN EARTH STATION IS EAST OF SATELLITE]
EARTH STATION ANTENNA LATITUDE (IN DEGREES NORTH OR SOUTH OF EQUATOR)
EARTH STATION ANTENNA AZIMUTH (IN DEGREES) EARTH STATION ANTENNA AZIMUTH (IN DEGREES)
" L" ISTHE DIFFERENCE BETWEENTHE EARTH STATION
ANTENNA SITE LONGITUDE ANDTHE SATELLITE LONGITUDE
AZIMUTH CHART
CHART 3
0°
5°
10°
15°
20°
25°
30°
35°
40°
45°
50°
55°
60°
65°
70°
75°
NORTHERN
HEMISPHERE
SOUTHERN
HEMISPHERE
WEST EASTWESTEAST
0
10
20
30
40
50
60
70
80
90
360
350
340
330
320
310
300
290
280
270

To insure that the Tx/Rx Mount and 2.4m SMC Offset Antenna is operating efficiently and at an optimum,
moderate maintenance is required.We recommend conducting a routine Maintenance Inspection every
six months or as needed if unusual circumstances occur, such as severe weather conditions, falling
objects or vandalism.The following checklist is provided for your convenience.
MAINTENANCE INSPECTION CHECKLIST:
1 - FOUNDATION
■Structural Damage
2 -Tx/Rx MOUNT
■All bolts (if any loosening has occurred tighten and torque - refer to Torque Chart page 3)
■Structural Damage
■Corrosion of galvanized steel members
(if necessary, repair with cold zinc-rich galvanizing paint)
3 - 2.4m SMC OFFSET ANTENNA
■Bolts - ⁵⁄₈” round head square neck, securing antenna to mount (Correct torque 20 Ft-lbs/27 N-m)
■Structural Damage
4 - BOTTOM FEED SUPPORTTUBE, SIDE FEED SUPPORT STRUTS AND ODU BRACKET
■All bolts (if loosening has occurred tighten and torque - refer to Torque Chart page 3)
■Corrosion of galvanized steel members (if necessary repair with cold zinc-rich galvanizing paint)
■Structural Damage
5 - FEED ASSEMBLY
■All securing hardware
■Structural Damage
■Feed Horn Weather Cover - Physical Damage (if damaged replace to prevent entry of water)
Upon inspection, make necessary repairs and replace any damaged parts.
For replacement parts, contact:
U.S.A.: VSAT Customer Service, Channel Master England: CHANNEL MASTER
P.O. Box 1416 Premier Business Park
1315 Industrial Park Drive Croft Head Road, Off Philips Road
Smithfield, NC 27577 U.S.A. Whitebirk Industrial Estate
Telephone: [phone] Blackburn, Lancashire England BB1 5UE
Fax: [phone] (0254) 680444 • Fax [phone]
MAINTENANCE
ITEM PART NO. DESCRIPTION QTY.
1 2020753-03 BACKFRAME ASSEMBLY, GALV 1
2 2070035-01 RD HD SQ NK BLT GALV ⁵⁄₈-13 x 5¹⁄₂”4
3 2509008-02 LOCK WASHER, GALV. ¹⁄₂”20
4 2389002-01 HEX NUT, GALV ¹⁄₂”-13 19
5 3040748-35 2.4M SMC ANTENNATOP HALF (TX QUALITY) 1
- 3040747-35 2.4M SMC ANTENNA BTM HALF (TX QUALITY) 1
6 2382600-01 HEX NUT, SS ¹⁄₄”-20 6
7 2502600-01 FLAT WASHER, SS ¹⁄₄”2
8 2602600-01 LOCK WASHER, SS ¹⁄₄”4
10 2020773-02 BOTTOM FEED SUPPORT TUBE 1
11 2509009-01 EXTERNAL TOOTH LOCK WASHER ¹⁄₂”4
12 2075088-01 HEX BOLT, GALV ¹⁄₂”x5¹⁄₂”2
13 2010301-02 L.H. CHANNEL, CAP MT., GALV 1
14 2389005-01 HEX NUT, GALV ⁷⁄₈”-9 3
15 2509008-04 LOCK WASHER ⁷⁄₈”1
16 2070020-02 RD HD SQ NK BLT GALV ¹⁄₂”x1¹⁄₂” GD 5 1
PARTS AND HARDWARE
Tx MOUNT AND BOTTOM FEED SUPPORT TUBE
ITEM PART NO. DESCRIPTION QTY.
17 2075209-01 HEX BOLT, GALV ¹⁄₂”x1¹⁄₄” GD 5 10
18 2020755-04 YOKE CAP ASSEMBLY, GALV 1
19 2020754-02 TOP PLATEYOKE ASSY, GALV 1
24 2070039-01 HEX BOLT ⁷⁄₈-9” x 6” 1
25 2020555-04 ELEVATION ADJUSTMENT SCREW 1
26 2010453-03 TRUNNION, GALV 1
27 2020774-01 SIDE STRUT 2
28 2072612-01 HEX BOLT, SS ¹⁄₄”x³⁄₄”4
40 2075202-06 AZIMUTH ADJUSTMENT SCREW 1
41 2509008-03 LOCK WSHER, GALV ⁵⁄₈”4
42 2389003-01 HEX NUT, GALV ⁵⁄₈” -13 1
43 2070035-02 RD HD SQ NK BLT GALV ⁵⁄₈”x1¹⁄₂”1
44 2075024-01 HEX BOLT, GALV ¹⁄₂”x1¹⁄₂”12
45 2509014-01 FLAT WASHER, SS ¹⁄₂”24
46 2060033-01 HEX BOLT, SS, ¹⁄₄”x1¹⁄₂” FULL THREAD 1
FIGURE - 12.0

22.6˚ OFFSET MECHANICAL
AXIS
(NORMALTO
ANTENNA FACE)
BEAM
AXIS
69.5"
MO
MH = HORIZONTAL FORCE
FV =VERTICAL FORCE
MT =TORSIONAL MOMENT
MO = OVERTURNING MOMENT
FV
MT
FH
2.4m OFFSET SMC ANTENNA SURVIVAL WINDLOADS AT 125 MPH VELOCITY
ELEVATION FORCE MOMENTS
DEGREES (POUNDS) (FOOT-POUNDS)
MECH. BEAM FHFVMTMO
0 23 3,330 -89 2,612 19,286
10 33 3,152 -666 2,557 18,255
20 43 3,064 -1,288 2,426 17,746
30 53 2,775 -1,843 2,202 16,072
40 63 2,442 -2,220 1,867 14,143
50 73 2,131 -2,442 1,568 12,342
60 83 1,776 -2,553 1,213 10,286
70 93 1,332 -1,976 933 7,715
MOBASED ON 69.5” FROM MOUNTING SURFACE TO C OF ANTENNA.
Values shown above represent maximum forces for any wind direction.
Height and exposure factors from the uniform building code are NOTincluded.
L
LL
MAXIMUM DISTANCE FROM GROUND TO C OF ANTENNA
6” (NOTE: C IS 6” ABOVETOP OF GROUND POLE)
GROUND FOR WIND SPEED OF:
PIPE EXPOSURE 125 MPH 120 MPH 115 MPH 110 MPH 100 MPH
6.62 O.D B 96” _ _ _ _
x 6.06 I.D. C 62” 67” 73” 80” _
Schedule 40 D _ _ _ 61” 73”
6.62 O.D. C 89” 96”
x 5.76 I.D. D 67” 80”
Schedule 80
TOP
BOTTOM
()
C
L
L
C
L
C
L
C
96.87
104.87
32.37
24.00
6.62 O.D. 16.75
63.50 3.25
10
6
12.57
92
12
22.6"
121.94
5
6.3
34.75
14.62 1.12 9.0 8.12 15.5
67
22.6"
10"
.75ø
ANT.
116.25
2.5 SQ TUBE
35.62
82.25
12.6" REF.
BOT. OF ANT.
4.0 SQ TUBE
26.50
11.00
13.75
ANT.
MECH AXIS
⁷⁄₈ø
69.5
SEE
CHART
TOP OF POLE
BOT. OF ANT.
BEAM AXIS
NOTES: 1. Antenna and mount certified to withstand
125 mph wind.
2. Chart based on A36 (36,000 psi yield) steel
and 1.5 stability - 1991 Uniform Building CodeTable 23G Exposure B, C or D at 0-15’ height above ground.
APPENDIX A
OUTLINE DRAWING
TYPE 243 2.4m OFFSET SMC REFLECTOR W/Tx/Rx MOUNT
ALL DIMENSIONS IN INCHES

HEX (PIVOT) BOLT, GALV. ⁷⁄₈-9 x 6"
Item 24
ROUND HD SQ NK BOLT, GALV. ⁵⁄₈-11 x 5¹⁄₂"
Item 2
HEX HD BOLT, GALV. ¹⁄₂-13 x 5¹⁄₂"
Item 12
HEX HD BOLT, GALV. ¹⁄₂-13 x 1¹⁄₄", Gd 5
Item 17 HEX HD BOLT, GALV. ¹⁄₂-13 x 1¹⁄₂" Item 44
HEX HD CAP SCREW, SS ¹⁄₄-20 UNC x ³⁄₄"
Item 28
Hardware illustrations are true size.Place actual hardware on top of illustration to identify.
HARDWARE SORTER