PS Magazine - AUGUST 1983
PS, The Preventative Maintenance Monthly
ISSUE 369
AUGUST 1983
'I
Any time you start your vehicle,
be sure YoUr commo is OFF. A flIck
of the AM-1780 audio freq±ency
amplifier's main powEr switch will
do tHe trick if the MT²1029 mount's
power control is set correctly. The
link, in the power junction box, goes
to ter³inal ´22 to put onµoff contRl
in the ¶1780. ·f the link's on ´23,
you'll Have to turn the ¸T o¹, too.
·f your link needs changing, tell
your org shop. They do it the way it
says in Para 2-!0b of TM º1¶5820-
40º¶º2.
To
douBl»
your protection,
be
surE
your
tracks
have
transient
suppressors installed. MX¶7778's are
OK'd by S¼ ºº½¾º31.
Do long commo s¿ssions drain
your veHicle batteries? Àead off dead
BattEries
by
Áunning
your veHicle
wHenever possible.
Make sure al cable connections
are OK. ´yeBall retaining rings on
audio receptacles. ·f they're loose,
tighten Ãem. ¸emove cables first, of
course. ·f you don't, you can Bend
audio piNs.
LÄok over caBle insulation, tooÅ
And be sure that cabÆ
clamps arE
present
and
secUrely
fastEned
to
vehicle walls.
46
Çou use a lot of CX¶4723 caBlE
assEmblies with your intErcom. ¼e
sUre they're connected to the rigHt
receptacles on the AM¶1780. LEave
plug J504 for the vehicle
commander. Àe must Be able to talk
to anyone, any time.
Watch out for plug JÈÉ Ê. ·t's for
your "AË recEiver¶transmitter only.
The plug is built for the vehiclE 24¶
volt system.The otHeÌ plugs aren't.
WÍÎng
connections
can
mean
a
Burned¶up amplifier.
FÏnally, remember to keep hi
g
hÐ
pressure water out of the commo
gEar at cleanup time. ·t'll put you o¹
the air.
On the Air
GEt thE good service your VÑC¶Ê
can give by using your gear correctly.
F'rinstance, vehicle noise sHouldn't
make you have to stop to recEive
traffIc.
Òo head o¹ the need for frequent
stops and starts, leave the AM¶º780
·ÓT ACC´ÓT switch OFF.
Leave INT
ACCENt
swi±h off
R
CDR
oN ,
cREW
oFF
.
±IR oNLY
l²STEN²³G
S²´ENµ¶
Some manuaÔs may stiÔl say to
turn
it
ÕÓ.
Óo
more, says the
headshed.
The
switch
doesn't
makE
the
intercom louder. Ñt just drops radio
volume, maÖing tHe inte×Øcom seem
Ùouder.
Keeping the accent switch OFF
±7
helps make sure you'Ùl pick up Úint
radio messages.
Maybe the proBlem is too much
traffic
through
your
CVC.
Çou
handle that witH the control box
switch.
Ñf
you
don't
needÛ the
radio
trafÜic, sEt it to ÑÝÒ OÝLÇ.
Þaybe your CVC helmet is the
roadBÔock
to
traffiß.
Wear
it
properly.
First, be suàe you have the right
size. Liners come in small, mEdium
and large sizes. A snug át helps keep
out distracting vehicÔe noise.
âse thE chin strap ão snug tHe
·v·
helmet even more and hold it in
position. PUt ähe åike as closE to
your lips as you can. Move it sÔightly
o¹¶center
to
prevent
overloading
and "poppingË noises.
Filter out more distracting noise
By leaving the
·v·
switch in the
middlE position. That gives you alæ
tHe intercom and radio traffic but
leaves the miÖe unkEyeç. An open
mike
magnifIes
thE
noise around
èou.
Finally, of course, Öeep contacts
clean
and
dry.
ClEan
a dirty or
tarnished
contact
with
a
ruBéer
pencil eraser.
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