36 MB pdf download - VIR History

2 Section
Porogroph I h(3)(q)
able to leave everlr fourth lead, in this case the green
lead, as a spare. It should be cut to such a length that
it will reach frorn the farthest jack to the farthest terminal
in a partictrlar run and then doubled back and
laced into the cable.
(b) TERN{INAL BOARDS.-There are two
methods of mounting the terminal boards as illustrated
in figures 2-10 and 2-I4. Wiring is as illustrated.
1. FRONT PANEL MOUNTING (Fisure
9-10 ).-The terminal boards on the equipment as
shipped are motrnted on special size B panels AN Typ"
I-242/G, which fit into regular rack mountittg space.
If the front panel space is not required for some other
Figure 2-ll. TyPe A, Close-Up View of
Wiring Showing Method of Locing qnd
2-12
NAVSHIPS
AF Cqbinet
Clqmping
9ro47
RESTRICTED
INSTALLATIfi'.d .q!'{n
GF*[d flot-{
equipment, this is the most convenient clcll^,cll, \'lr.rittg
is as shown in figure 2-10. In clamp'tg tt;,. '',',,irir,l4,,
be sure to place the clamps in such o ptrsiricr. ti,, il.e
-"th jre
boards may be pulled out throtrgh the front ,
wiring corlnected.
2. SIDE PANEL MOr NTII.IC D't,Q'trr:
2-1ln).-should additional front panel mounting spat' '
be required, the terminal strips may be mounted
the side of the Cabinet opposite from the side whicl:
carries the convenience outlet strip (right hand looking
from the rear). The mountittg is accomplished by drill'
ing and tapping appropriate holes in the rear vertical
corner angle of the Cabinet. One of the movable vertical
channels is installed in such a position that it may
be drilled and tapped to support the opposite end of
the panel. This type of mounti.tg is possible only if
the components mounted on the front panels do not
protrude more than 4L,/2 inches beyond the rear of
the front panel.
3. WIRINC THE TERMINAL BOARDS.-
The terminals on the boards are numbered in pairs.
These numbers correspond with the pairs of sim" Y
numbered jacks on the jack strips. Figure 2-40 's a
typical connection diagram. The actual connections
will of necessity be determined by the needs of the
individual station.
In making the connections on the terminal strip
end of the internal wiring, Thomas and Betts Grounding
Ferrules #200-30006 or the equivalent are used
in all cases. These ferrules are installed as illustrated
in figure 2-L5. After the spade lugs are installed on
the ends of the conductors, ring out all circuits and
clip the spade l.rg rvhich connects to the right hand
jack of a particular lair, thus making it possible to
maintain polarity. The terminal board illustrated in
figure 2-L6 is wired using this method. Solder on a
piece of # 14 AWG tinned bus wire as shown in figure
2-L6 and solder the groundittg braids to it. It is not
necess ary to ground the panel itself as the paint he.s
been omitted around the mountittg screws to make it
self groundittg. Remember to leave enough cal,'Ie to
allow the terminal boards to be pulled out for servicing
with the wiring connected.
(c) AF SELECTOR SWITCH WIRING.-Referring
to figure L-I7, it can be seell that the spacing
between the terminals is very close. Tl ' ends are
made up using the Thomas and Betts G,r"ounding Ferrules
#200-30006 or equivalent as shown in figure
2-15. The shield is not grounded on this end. l. prcce
of #L radio grade spaghetti L/2" long is slipped qvet
the grounding ferrule to prevent it from trtalrirtg ':lectrical
contact with the terminals, thus causi., ,; a . lrt
circuit. A piece of #9 radio grade spa.tahe{tr l" ltlng
is then slipped over each conductrr and tlre 1.;
*rle lugs
which come secured to the terminals are c,,,,:{':. ir t ea,. h
frFiK$rhlAt