( ) Mount each Stub Base Bracket to the AV-680 Radiator using a Radiator Bracket
(RB), (2) 6-32 x 1 1/2" screws (S3), and (2) 6-32 lock nuts (N1). Place the Single Stub
insulator opposite the Single Stub Base Bracket shown in Figure C.
( ) NOTE the degrees offset for each bracket and the distance from the base insulator
(IN) in Figure C. Position the Stub Brackets ABOVE the Radiator Brackets.
TASK III
Stub Insulator Assembly
( ) Place the AV-680 Radiator on a flat surface such as a driveway or garage floor. This
will aid in mounting the Stub Insulators by keeping them aligned with each other.
( ) Refer to Figure D for Stub Insulator Assembly. There are three types of stub
insulators: Single, 90 Degree and 180 Degree. The 180 Degree insulators are used with a
Single Stub insulator to make a Three Stub insulator. The locations of the Single
insulators are labeled «A", 90 Degree insulators are labeled "B" and the Three Stub
insulators are labeled "C".
( ) Attach 90 Degree Stub Insulators (P1) to a Radiator Bracket (RB) using (2) 6-32 x
3/8" screws (S1) and (2) 6-32 Keps nuts (N1) as shown in Figure D.
( ) Attach Single Stub Insulators (P3) to a Radiator Bracket (RB) using (2) 6-32 x 3/8"
screws (S l) and (2) 6-32 Keps nuts (NI).
( ) For Three Stub Insulators, attach a Single Stub and a 180 Degree Stub Insulator (P3
& P2) to a Radiator Bracket (RB) using (2) 6-32 x 1/2" screws (S2) and (2) 6-32 Keps
nuts (N1).
( ) Mount the Stub Insulators on the AV-680 Radiator using a Radiator Bracket (RB), (2)
6-32 x 1 1/4" (S4) screws, and (2) 6-32 Keps nuts (N1). USE the dimensions in Figure E
to space and rotate the insulators into their proper locations. Position the Stub Insulators
ABOVE the Radiator Brackets.
TASK IV
Stub Assembly
( ) Refer to Figure F for the stub assembly diagram.
Assemble the stubs on the antenna.
( ) All four stubs share the same base tube ( E1 ) which has the threaded insert in one
end. This end attaches to one of the metal brackets at the bottom of the antenna. You
may attach all four of these elements sections to the antenna using the 10-32 screw and
lock washer. Use “Figure G” For location of each Stub.
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