PS Magazine - TB 43-PS-701

PS, The Preventative Maintenance Monthly

ISSUE 701

APRIL 2011
PS Magazine - TB 43-PS-701 - Page 23 of 33
42
PS 701
APR 11
Dear Editor,
The SINCGARS radio vehicular amplifier adapter (VAA) is suffering from
abuse and unnecessary downtime. To help end this abuse, I would like to
make three points:
First, when you remove the
radio and/or PA from the VAA
by loosening the thumb screws
releasing the clamps that hold
the radio and PA, screw the
thumb screws back in. This is
seldom done and it leaves the
screws vulnerable to getting
bent or broken. Often when the
screws get bent, they cannot
be removed and replaced by the
user and the VAA must go to
support for repair.
Second, spring-loaded
terminals, E1A/B and E2A/B,
on top of the VAA become
loose or get broken. When
this happens, the mounting
hardware drops down and then
rolls around inside high-voltage
circuits. To prevent shorting of
internal electrical components,
the VAA must be taken out of
service immediately and sent to
support for repair.
Third, time and time again over my
many years of working with SINCGARS,
I have received VAAs with the claim that
they “won’t power up” or “no power.”
But 99 percent of the time, they will
power up and they do have power! What
they don’t have is the local (LCL)/
remote (RMT) switch set to LCL! If the
unit is set to RMT, the unit will fail to
power up. Please, check this before you
submit a VAA as having no power.
Thanks for listening.
SFC David A. Jones (Ret)
Electronic Tech III, URS
Ft Drum, NY
Editor’s note:
Sergeant Jones has been at this repair game for 30 years, so he knows
what he’s talking about. Let this old editor add an addition to point number three:
check the power light to make sure the bulb is not burned out or that it’s not “shaded.”
More than a few “no power” submissions can be traced to a burned-out bulb.
NSN 5340-00-
Inner Diameter
(inches)
Qty
845-2072
291-5322
291-5323
200-8560
598-0146
200-8559
291-5347
286-9427
286-9424
286-9418
200-7449
200-3045
579-9678
515-0595
531-6857
.125
.173
.235
.313
.36
.438
.5
.75
.875
1
1.125
1.5
2
2.25
2.5
1
1
100
1
1
1
1
1
1
1
1
1
1
1
1
SINCGARS…
VAA Problems and Solutions
you’ll
need the
right
size
loop
clamp
to run
the wirinG
for yOur
radios
and other
commo!
order
from this
list…
Screw
thumb-
screws
back in
Terminals get loose or break
Is it set
to LCL?
ohh,
I’ve got
problems!
and now
I have
solutions!
Lop Clamp NSNs
701.42-43.indd
1-2
3/1/11
11:52 AM
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