PS Magazine - TB 43-PS-625
PS, The Preventative Maintenance Monthly
ISSUE 625
DECEMBER 2004
DO:
DO:
•
Line up the upper
and lower elements
and gently push the
elements together
until the assemblies
fit snugly.
•
Rotate the upper
element clockwise
onto the lower ele-
ment until the two
elements are firmly
attached.
•
Carefully rotate
the upper element
counter-clockwise
to disconnect the
upper element from
the lower element
and carefully sepa-
rate the elements.
•
Carefully line up the ferrule on the lower antenna element assembly
with the threaded base on the antenna spring base.
•
Slowly hand-tighten the ferrule by wrapping your hand around the
metal ferrule and rotating the ferrule clockwise until the antenna is
firmly attached to the spring base.
•
Reverse the procedure to disconnect the lower antenna element from
the spring base.
DON’T:
•
Overtighten the elements! Over-tightening the elements will increase
the likelihood of damage to interior components—like the contact
point—of the upper and lower elements.
DON’T:
•
Install the upper and lower element
assembly onto the antenna spring base
by rotating the element to secure the
ferrule onto the spring base. This kind
of mating might damage the lower ele-
ment assembly with the separation of
the fiberglass antenna element from the
ferrule. Also, you could do damage to
interior components of the antenna ele-
ments resulting in degraded antenna
performance and to the thread surfaces.
PS 625
DEC 04
40
AS-3900A/VRC Vehicle Antenna…
T
he AS-3900A antenna, NSN 5985-01-308-8988, used with the SINCGARS
ground radio is getting damaged far too often.
The damage is happening when
it’s assembled, when it’s installed,
and when it’s removed. The damage
is happening to both the lower and
upper antenna elements and the
antenna spring base.
The antenna is not getting a
break! Or at least not a good one.
Most of the damage is to the
threads on the elements and the base
and it’s happening because proper
assembly, installation and removal
procedures are not being followed.
Here are the
do’s and
don’ts
when
connecting and
disconnecting
the upper
and lower
elements…
Here are the
do’s and
don’ts
when
connecting and
disconnecting
the elements
to the spring
base…
Damage is to
the threads on
the elements…
…and the base
if only pm
had been done,
we
wouldn’t
have to
operate!
now, this
antenna’s
survival is
anybody’s
guess…
…nurse!
get me a
scalpel,
stat!
…and lower
elements…
CAREFULLY
Connect
upper…
Carefully tighten ferrule to spring base
You could damage
interior components
Note:
order
lockwire
with NSN
9505-00-
293-4208
625.40-41(C!)
11/2/04
11:02 AM
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