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GENERAL
DESCRIPTION
NAVSHTPS 9rO47
Section 1
Porogroph3d(5)(o)
Figure I-9. Jqck PqnelANType J-239/G, FrontViewWith One RF Jqck Switch Novy Type CIA-491388 Removed
(u) ANTtrNNA SEI,ECTOR SWITCH AN
TYPES, SA-139 / U , SA-140 ,/U , and SA-14f /V .-The
A .'crrna Selector Switch cornes in three sizes | 20 position
designated as AN Type SA-IS9./U, 40 position
Cesignated rrs AN Typ" SA-I4}/U, and 60 position
designated as AN Typ" SA-I4I/U. The constrtrction
of all three tvpes is similar, the difference being in the
nunlb:'r' of contacts provided.
The 10 and 60 position srvitches consist of a rillzerr
plated brass contact ring in which specially constructed
coaxial silver plated contacts are arranged in two concentric
circles, each circle containing half the total
ntrrnirer (see figtrre 1-B). Each contact is slrrl'ounded
by a poll'styrene instrlator rvhich is fitted into arl
appropriate hole in the contact ring. A Connector
Nil'i'\' Typ" -49191 screws into thc- bottorn of the contact
ring to rnat€' with the silver contac:ts. The contacts
protrtrcle slightl'v riirove the plane of the contact
ring. The rotor of the switch consists of an arm ftttecl
q
with specially designed RF spring loaded coaxial fittings
on each end which make contact with the colr- ;,
tacts in the contact ring. The arms are of different 'ilengths
so that one rnakes contact rvith the inner
circle of contacts and the clther rnakes contact with the
outer circle. The contacts in the contact ring are staggered
so that one arrn is rnaking contact while the
other is between the contacts. A suitable detent
rnechanism is includecl which insures positive positioning
of the rotor at the point of proper contact. The
coaxial fittings on the encls of the rotor anns are connected
in parallel to a coaxial fitting at the exact center
of rotation which serves as the output connection for
the switch. The arm is grounded to the contact ring
lry sliding brass contacts on either: end. The rotor is
moturted on ball bearings which allow it to turn freely.
The whole switch is enclosed in a cadrnium plated
steel box of welded construction.
The 20 position srvitch is sirnilar in construction
except that the rotor has only one arm and the contacts
al'e spaced in one circle on the contact ring.
(6) IACK PANFTL AN
I-i:) "-- [.rck Panerl AN Ty'p"
oR,!6lliA[
TYPE I-239/C ( Figure
I-239/C rnounts on the r
RESTRICTED
front of the cabinet and cclntains eleven Jack Switches
Navy T,tp" CIA-49IBBB. It is normally used to distribute
IIF signals from Jack Panel AN Typ" I-238/G
to the station receivers and,/ or multi-couplers and auxiliarv
ecluipment. It is a srze A panel.
(C,.) RF JACK SWITCH NAVY TYPE CIA.
49I3BB (Figure 1-10).-The rear of each RF Jack
Switch is eqtripped with trvo coaxial cable connectors,
Navy Typ" -49f91. The design of the Jack Switch is
such that when no patchcord plug is inserted into the
front receptacle (Navy Typ" -19L20) the two rear connectors
in the Jack Switch are bridged together with
a sliding silver alloy contact. The received signal is
therefore applied to a receiver or multicotrpler. When
a Navy Typ" -4912fA patchcord plug is inserted in
the front receptacle, the upper rear connector (antenna
input) is disconnected from the circuit and the
lower rear connector (receiver input) is connected with
the inserted plug. This enables the operator to disconnect
the receiver from the nonnal antenna and by
patchcord connect another antenna to receiver.
(7) IACK PANEL AN TYPE I-237/C (Fisure
1 -11) .-I"ck Panel AN Typ" I-237 / C is a size A panel,
NORMAL CONNECTION
BTOG
PATCHGORD CONNECTION
ATO B
NAVY TYPE- 49I9I
COAXIAL CONNECTOR
Jo RECETvER
NAVY TYPE -49I9I
TO ANTENNA
Figure l-10. RF Jqck Switch Novy Type CIA-491388,
Functionol Diogrqm