Hy-Gain AV-640, Instruction & Assembly Manual

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TASK I
Center Radiator Assembly
( ) Refer to Figure A to assemble the Center Radiator. Attach BA tubing section to either
end of the Base Insulator (IN) with (2) 1/4-20 x 2" bolts (S8) and (2) 1/4-20 nylock nuts
(N5). Do not tighten the nuts at this time.
( ) Find the (2) counterpoise rings (RI). Press the flat sides of the rings together and slide
them onto the Base Insulator (IN). Leave rings loose at this time.
( ) Attach the drilled end of tubing section BB to the Base Insulator (IN) with (2) 1/4-20
x 2" bolts (S8) and (2) 1/4-20 nylock nuts (NS). Do not tighten the nuts at this time.
( ) Place (1) hose clamp (HC 1) over the slotted end of tubing section BB. Slide unslotted
end of BC tubing section 6 inches (15 cm) into BB. Tighten hose clamp. NOTE: For
protection against oxidation, a conductive paste such as NoAlox® may be used between
telescoping pieces of aluminum tubing only. Do not apply the paste to insulators or coax
connections.
( ) Place (1) hose clamp (HC 1) over the slotted end of tubing section BC. Slide unslotted
end of BD tubing section 6 inches (15 cm) into BC. Tighten hose clamp.
( ) Place (1) hose clamp (HC 1) over the slotted end of tubing section BD. Insert AV-640
Coil Assembly (LI) 4 inches (10 cm) into tubing section BD. Tighten hose clamp.
( ) Place (1) hose clamp (HC2) over the slotted end of coil assembly AV-640L1. Slide an
end of tubing section BE into top of L1 coil assembly. Set length to desired L40 value
from Chart A (p 19).
( ) Place 5/8" plastic cap (C2) on end of tubing section BE
TASK II
Stub Base Bracket Assembly
( ) Refer to Figure B for Stub Base Bracket Assembly. Study Figures B and C to learn
how the stub base brackets are attached for each band. Note how the brackets are offset
90 degrees from each other for proper antenna assembly.
( ) Find the aluminum Stub Brackets (SB 1 & SB2). Attach a Radiator Bracket (RB) to
each Stub Bracket with (2) 6-32 x 3/8" screws (S I) and (2) 6-32 Keps nuts (N1) as shown
in Figure B.
( ) Find a Single Stub insulator (P3). Attach it to a Radiator Bracket (RB) with (2) 6-32 x
3/8" screws (S I) and (2) 6-32 Keps nuts (NI).