TM 11-5840-281-35/1
(24) Remove pin (87).
(8) Install ring (77) with slots centered over
(25) Remove three screws (88), lockwashers
linkage sockets in transition (88).
(89), flat washers (90), phase section assembly gasket
(9) Insert two linkages (78) into waveguide
(91), and ring (92).
choke (79) with chamfered end of linkages toward center
(26) Remove pin (93).
of waveguide choke.
(27) Remove two screws (94) and polarizer
(10) Install waveguide choke and linkage
clamps (95 and 96) from phase section (97).
assembly with grooved surface of waveguide choke (79)
(28) Remove two rubber plugs (98) from housing
facing away from feed horn.
(99).
b. Assembly. To assemble the azimuth horn and
NOTE
polarizer, proceed as follows: (1) Press two rubber plugs
Align rectangle of waveguide choke (79) with
(98) into housing (99).
rectangle of transition (80).
(2) Attach polarizer clamps (95 and 96) to phase
(11) Install second ring (77), centering sl1ot over
section (97) using two screws (94).
linkages (78).
(3) Attach gasket (91) and phase section (97) to
(12) If setscrews (81) were removed, reinstall in
housing (99) using three screws (88), lockwashers (89),
housing (99).
and flat washers (90).
NOTE
NOTE
Setscrews (81) must be adjusted so that rings
If phase section (97) has been previously aligned
(77), waveguide choke (79), and transition (80)
to this horn and polarizer, insert pin (93) in
will have minimum end play, but will rotate when
predrilled hole. If this is a new phase section,
waveguide (75) is installed. Setscrews (81)
install pin (93) as part of the final alignment.
must also protrude same distance.
(4) Attach horn (85) to phase section (97) using
(13) Install preformed packing (76) on
three screws (82), lockwashers (83), and flat washers
waveguide (75) and install waveguide on housing (99)
(84).
using collar (74).
NOTE
NOTE
If horn (85) has been previously aligned to this
The sockets in waveguide (75) must engage
horn and polarizer, insert pin (87) in predrilled
linkages (78), and holes in waveguide (75) must
hole. If horn is new, install pin (87) as part of the
align with locating pins in housing (99).
final alignment.
(14) Secure collar (74) with setscrew (73).
(5) If cover (86) was removed or cover is being
(15) Place ring spacers (20), bushing (19), and
replaced from horn (85), it should be cemented to the
ring spacers (13) on gearshaft (21).
horn with a rigid-ratio mixture of Resiweld No. 7004 or
(16) Press gear (12) on gearshaft (21) and
equal.
secure with two setscrews (11).
(6) Position housing (99) with horn end down
and install ring (92). Insure that ring (92) is seated
NOTE
correctly on phase section (97).
Gear (12) and gearshaft (21) should be pressed
(7) Install transition (80) so that centerline of
together snugly but gearshaft (21) should be free
longer rectangular dimension is approximately 22/2
to turn in bushing (19).
degrees clockwise from housing (99) vertical centerline
when looking from waveguide end toward horn end.
(17) Install gear assembly into housing (99) and
attach with two screws (18).
NOTE
The sector gear on the transition (80) must line
NOTE
up with beveled spur gear access hole in
Spacers (20) should be added or removed as
housing (99).
necessary to allow gearshaft (21) to mesh with
the beveled sector
5-10
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