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2 Section
Porogroph I h(3)(c)
Figure 2-14. Top View Showing Alternqle Method
of Mounting Terminql Boqrds
conductor. These spades are then bent out to about
45o to further lessen the danger of short circtrits. The
individual pairs are then laced together into convenient
size cables and painted with fungicide varnish.
i. EXTERNAL INTERCONNECTINC CABLES.-
It is advisable to complete the internal cabinet wiring
before installittg the external wirittg.
(1) RF WIRING.-The receiver inptrt and miscellaneous
apparatus jacks have been left blank in
figure 2-9 as these connections vary with individual installations.
Connections to the antenna input of the receivers
are made with RG-12/U cable, and the connectors
are installed ' the Signal Distribution Unit
end of cables as sh \^/n in figure 2-8. See the applicable
instruction book for the receivittg equipment for
the type of plug to be installed on the other end of
these cables. The cables are led throtrgh the regular
RF cableways in the "Q" flooring or equivalent of the
station to the proper receivittg equipment (see figure
2-L for a description of the "Q" flooring). The cables
must be clamped with the clamps provided inside the
Signal Distribution Unit in the same manner as the internal
cables illtrstrated in figure 2-9. Keep in mind
that the bending radius of the RG-r2 /rJ cable must be
not less than ten times the diameter of the cables.
Refer to figures 2-37, 2-38, and 2-39 for the external
connections to be made in a typical installation.
NAVSHIPS 9rO47
INSTALI,\TIT: N ANI,
s:r'-.tATloN
(2) OPERATOR'S POSITION.- ,i ' .: standard
operator's position consists of two ,,ji-i,l i'r's rnourrted
so that they may be conveniently coir.^oilecl by c:e
operator. A Control AN Typ" C-443/G is pro'-' ,:',1
for headphone outputs as part of the Signal Dist,.:':if -
tion Unit to enable the operator to guard either: l':' "
ceiver or, by operation of a knob, to guard botl, ,rt
once. The function of this control is covered moro
fully in par agraph 2, e of this section. The installit,g
activity must mount this control on the operator's
table. Alternate methods of mounting the control are
shown on figures 2-31 through 2-36. The installirrg
activitv must design and fabricate suitable mounting
brackets for this purpose as none are provided by the
contractor. Wiring of the control is shown on the
interconnecting diagrams figures 2-37, 2-38, and 2-39;
and the schematic figure 2-29.
(3) EXTERNAL AF WIRING.-As explained
above, two receiver output cables go into each Control
AN Typ" C-443/G, while only one cable (TTRS-4) goes
out. Thus there are approximately half as many receiver
output cables which go into the AF cabinet as
there are receivers. An undetermined number of AF
cables go to the loads, the number being dependent
upon the number of speakers, recorders, teletypes, etc.
which are in the station allowance. The receiver output
cables come in on the left hand side of the AF
cabinet of the Signal Distribution Unit and the load
cables go out the right hand side looking from the rear.
Ctrt-outs for these cables are shown in figure 2-2. Remember
that the AF cables are run in the AF cableways
of the "Q" flooring or equivalent cable ducts.
The receiver output cables come up the left hand
side of the cabinet as explained above. There is not
enough space for a single layer of cables, so they must
be clamped in two banks. Arrange the layers so that
the cables which connect to the highest terminal strips
in the Cabinet are on the bottom layer. One set of
clamps hold both lavers of cables.
The load cables go out of the right hand side of the
AF cabinet as explained above. They are stacked in
layers and clamped in exactlv the same manner as the
receiver output cables.
Both the receiver output and the load cables are
TTRS-4 cable. As shown in figures 2-10 and z-ll, the
complete cable is brought in through the cut-out ir
the floor and clamped. The outer plastic covering is
cut off at about the level of the terminal board to whicli
the conductors are to connect. The twisted pairs are
then laced together and formed into a loop as shorn'n
in figure 2-Ll which leads into the rear of the terminal
boards. Connections are then made to the al,[)l'op ;tt€
terminals with spade lugs and Thc'mas ai rd Betts
Grounding Ferrules #200-30006, as :'llc".vr, in figu:c
2-15. The groundittg braid is soldered i: the ,..'.lrirmon
2-1 4
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