Channel Master 243 Instruction And Assembly 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”x 5¹⁄₂”Round Head Square Neck Bolt (Item #2), securing antenna to mount.
Torque to 35 Ft-lbs (47 N-m).

¹⁄₂”x 1¹⁄₂”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” (CU YD) “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 ¹⁄₄­20 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,
INSERT THRU 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"
INSERT THRU 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”x 1¹⁄₂” 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”x 1 ¹⁄₄” 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”x 5¹⁄₂” round head square neck bolts

(2) into reflector assembly (5) and affix on to back­frame.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 loca­tion. Continue this process, working toward the cen­ter, 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: Cer tain models reuqire additional alignment
instructions. Refer to supplement for detailed instruc­tions.

FEED SUPPORT TUBE INSTALLATION

10 - Install ¹⁄₄”x 1 ¹⁄₂” 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”x 5¹⁄₂” hex bolts, four external
tooth lock washers and hex nuts (12, 11 & 4).

Reference Figure 1.7.

IMPORTANT: ¹⁄₄”x 1¹⁄₂” 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.
Lea

ve 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”x ³⁄₄” 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”x ³⁄₄” hex bolt, lock wahesr and

hex nut (28, 8 & 6). Tighten and torque hardware
securing side struts to feed support tube only to 6 Ft­lbs (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

**

*

8

6

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 (* & **).

*TORQUE TO 35 FT-LBS (47 Nm)

**TORQUE TO 4 FT-LBS (5.4 Nm)