Operating instructions
r1.
\\'hen
equipment
rvhich
has
been
exposed
to
111"
e,,ltl is
brought
into
a warm
room,
it
rr'ill
sn'eat
ancl rvill
continue
to do
so until
it
reaches
loom
temperature.
When
the
equip-
ment
has reached
room
temperatrtre,
dry
it
thoroughll'.
This
condition
also arises
when
equipment
warms
up during
the day
after
ex-
posure
during
a
cold night.
e.
Use any improvised
means
to
protect
dry
l.ratteries,
since
they ll'ill
fail if
not
protected
against
the cold.
Preheat
the
batteries.
To
prevent
heat
loss,
place
them in
bags lined
r,vith
kapok,
spun-glass
fiber
materials,
animal
skins,
or'
\\'oolen
clothing.
28.
Operotion in Tropicol
Climqtes
When operated in
tropical
climates,
radio
equipment
may
be installed
in
tents, huts,
or,
u'hen
necessar5',
in under.qround
dugoi"rts.
When
equipment
is installed
belor,v
ground
and u'hen
it
is
set up in
swampy areas, moisture
condi-
tions
are more acute
than normal in
the tropics.
Yentilation
usually is
ver-v
poor,
and
the high
relative humidity
causes
condensation
of mois-
tnre
on
the
equipment
rvhenever
the tempera-
tr-rre of the equipment
becomes lorver
than
the
ambient air. To minimize
this condition,
place
lighted
electric bulbs under
the
equipment.
29.
Operotion in Desert
Clirnotes
a.
Conditions similar
to those
encounterecl in
tropical
climates
often
prevail
in desert
areas.
Use
the same measures
to
insure
proper
opera-
tion
of the
equipment.
ó.
The
main
problem
r,vhich
arises with
equipment
operation in
desert
areas is
the large
amount
of
sand or dirt
and dust
which
enters
the moving
parts
of radio
equipment.
The ideal
preventive
is
to house
the
equipment in
a dust-
proof
shelter.
Since such
a building is
seldom
available
trncl u'oulcl
require
air conditioning,
the
next
best
precaution
is
to make
the building
Ín
rvhich
the eqLripment
is locatecl
as clustproof
as
possible
l-ith
avail:rble materials.
Hang
rvet
sacking
over
the u'inclorvs
ancl cloors,
cover
the
inside
walls
rvith heavy
paper',
and secnre
the
side
rn'aÌIs
of
tents
u'ith
sand
to
preverrt
their
flapping
in
the r,vinci.
c.
Never
tie
porver
cords,
signal cords,
or
other lvire
connections
to
the outside
or inside
of the
tent. Desert
areas
are subject
to sudden
rvinC
squalls r,vhich
may
jerk
the
connections
loose
or break
the lines.
d.
Take
care
to
keep
the equipment
as
free
from
dust
as
possible.
N{ake
frequent
preven-
tive maintenance
checks
(ch.
3).
Pay
particular
attention
to
the lubricants.
t9