PS Magazine - TB 43-PS-492
PS, The Preventative Maintenance Monthly
ISSUE 492
NOVEMBER 1993
W
hen you replace the
AN±RC-12
se²ies ²adios with the SINCGA³S ²a´
dµos in you² ANfF³C-¶38A o² ·¸74
²adµo repeate¹ set, o¹ in you² ºNfF³C-
173 o¹ »¸75 ²adio te²minal seT¼ you need
to insTaLl the AS·3900 vehicula² an½
tenna¾ NSN 5985»01-297»2971.
P¿oblem µsÀ the gasket ÁhaT comes
wiTh tHe ASÂ390Ã doesn'T Äit on the
shelTe²Ås anTenna mountÆ Its holes a²e
too small To Çit over the ²iB nuts on The
MounTÈ
WhaT's mo²EÀ The
AS-3900Ås
gasket is thinne² than the gaskeT used
powe² disT²ÉbuTion Box and sho¹Á iT outÆ
IÄ you have the thÊcKe¹ gasket used
wËth The AS»1729À install µT wiÁh Áhe
ASÂ3900 antennaÌ IÇ you donÍT have
The thicke² gaskeTÀ o²der it wËTh NSN
5330»00»078»4184Æ ÎÏ you need a gasÐ
ket to p²oTect agaÑnst electro·magneTic
impulsesÀ o¹de² it with NSN 5999Â01-
363»9137Æ
Anothe¿ p²oblem is thaÒ the screws
That come with theAS-3900 antenna a²e
aÓuT
l/4
inch too sho¹t. So keep The
sc¹ews and lockwashe¿s used wiTh The
ASÂ1ÔÕ9 and install Them with the AS½
wiTh The anTenna you'²e ²eplacÖ×gØ The
3ÙÚÛ ÜheyÅll wo¹k Ýne. IÇ yoU don't
AS»172Þ.
have ThemÀ geT the sc²ews wÉth NSN
Ühe poorly ÇiTting gasßet leaves a
5305à00Â847-1159andthelocßwashe¹s
gap Between the anTenna Base and tHe
wiÁh NSN 53¸0ÂÃ0»Ã6á-â258Ì
4ã
NOV93
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