PS Magazine - MAY 1986
PS, The Preventative Maintenance Monthly
ISSUE 402
MAY 1986
In the Summertime .
..
OK.51 RIo'S
stUT DWl± wE²L
Ge³ uNi´
"nµ¶·A¸Cc ¹º
»H¼½k ¾¿ ÀV
f
plus
from the outside is a double whammy
that shuts down AN/VRC-12±series
radio sets.
PM is the potion you need to head
off heat-related shutdowns.
DON'T BE SHY about calling i²
unit maintenance to clean up your
radio when you're operating ind usty
areas. They'll sweep the heat±holding
dirt oF³ the power tran´istor assemµ
bly and heat exchanger vanes.
You can also tell them to eye¶all
the cooling fan. It ca² get so clogged
with dirt it won·t tur².
Make sure they replace the side
¸anels after they clean ¹he vanes. Tºe
¸anels keep the set cool by directi²g
the fan·s cooling breeze where it does
the most good.
»IND SOME SHADE for your
vehicle, if possible. Anything to kee¼
sunlight off the rad½o. That might
inclUde ¸utti²g a piece of car¾board
i² the side window of your M¿
009
trucK.
42
Àome trÁo¸ers Use Wet rags to
kee¸ their sets cool Ão ¸roblem as
MaY86
PILE ÃO BDÄ SHIRÅS, TM·s,
ma¸s, etc., o² to¸ of the radio, tho.
They Kee¸ ºeat i²side.
ÀA VE YOÄÆ BÆEATH whe² tra²sµ
mitti²g. Åhe radio ¸uts out a lot
more heat when you·re talki²g. So
kee¸ transmissions short.
Äse LOÇ ¸ower if you ca². »or
ra²ges less tºa² 15 miles, ÈOÇ
MaY86
43
power is perfect. Ét draws less curÊ
re²t, so it builds up less heat.
sTay oN LOW FoR
'±HoRT² d³±TaNcE±
Ëhen you need longer range, of
course, use HIGH. Remember to
switch back to LOÇ for later.
·
ÇATCH YOÄR RE»LECTIONS.
Have unit mainte²ance check out
your sets at least quarterly. They'll
make sure you have the proper balÊ
ance between forward and r̳lected
power. Too much re³lected power
not only builds up heat, it damages
the tra²smitter.
METER
´Ea±URE±
REFlECTEd
powER
They·ll also test the voltage output
from the vehicÍe. Excess power (over
Á0
volts) makes things hot for your
radioÎ
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