PS Magazine - MARCH 1979
PS, The Preventative Maintenance Monthly
ISSUE 316
MARCH 1979
A cool TripLe IF in your AN/MPQ-
46
Improved HA WK HIPIR heLps
yoUr radar to lock in o± a target. Way
to Go.
BU², let t³at ol' Triple IF (Trip´e
StaGe
I±termediate
freqµency
Amp´i¶ier) Get overheated ·rom ´ack
o¶ coolinG air, and yoUr radar'¸
per¶ormance wi´L no¸edive. Bad.
Here are ways ²o ²µrn o·¶ the heat:
CoolinG air gets to ²³e Triple I¹
o±ly a¶²er sU··icient air pressUre bºilds
Up in compartmen²s o· adjoining
components.
Keep all doOr¸ or covers tigh²ly
closed dUri±G opera²ion, especia´ly ²he
door o± the rear o· the radar
transmitter anten±a.
1±
Missing boLts let ai» escape. Be sºre
alL bolt¸ are in p´ace and ¸nUg be·ore
yoµ operate. The bo´²¸ on ²he
2
doors
o¶ the head as¸emb´y get special
notice. There are a lo² o· ¼em, bU² Yoº
½
.f'"] ·¢
±
1
need every one. And, keep 'em ¾´¿
That little job is t³e sa¶ety scren
t³at sits over the air dUct i±side the
pedestal baseÀ It also sits directly over
²he ·¾n ²h¾² pº´l¸ in ²he coo´ing
oµt¸ide and ·eed¸ tha² air ºp ²hroºgh
the ¾n²Áenna and ²o ²he Âriôe Äf.
Clea± t³at screen, olÅ bUddy, or
more tha± Triple If
ÆÇe iDea is, ÈÇesE precaUtion¸ add
Up to a cool antenna ¸ystem and a cool
É Triple If .
.. which needs cooling
becaU¸e it genera²es heat. Its circUit¸
are sÊnsitive to that heat. When they
get too mµch, there's a high signal to
Ë noise ratio . . . and yoU've got poor
Well, thereÌs a screen in ²he radar per¶Írmance.
pedest¾l, Unseen and o·ten ·orgot²en,
That ca± meÎn damage ²o comÏ
that¼s jUst as importan² ²o air ·´ow. I· ponenÐs and readjUstment o¶ circUits.
it¼¸ nÑt checked or c´eaned monthly, it
can cLog and ¸teal the air ¶rom the
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