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GENIJ IAL ()
DESCRlPTtOr.l
NAVSHIPS 9rO47 Section 1
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GENERAL DESCRIPTION
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I. GENERAL DESCRIPTION. r4B-f
cL. PURFOSE -fh6 Navy Sigqal Distribution Unit
, ^ is a standa cil:BF and AF't'lnanually operated
-'ct t .r
tftur ti'Amfrg ar', I trCdt;nng equipment:fur use in Naval
:*.t'5[gr€
col]t- r,, rnication,centers.
equiprntn t .&mitJ' standardization of compon-
-thods of , stallation and l, ittg of AF lrd RF
slgna :rc'--is, r. -d . provides ma .-i a "irnum
.r^
operational
fexibr,,i \,,L ^:] ;.'.+ff I i'l
lw. ''
r
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+ ')EsIf;
>,J_\:r: - fd mee +L requir its of paragit.
r.. I, &, .darCized 'r-rr-e available
from rvzv/
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s which have bec .
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sraL.Iard r relay rack -:.h' . i., ly .
desired
order. Blani.
p&IlSlt,rl .'ru Z.'J,
necesgl lo.
obtaihd' ' lI
orization.
The Typ. A Sigr ' Dist.'ibution Unit, which con-
;ists of three caL,^ret. s t";scribed in this section.
Type.s B and C are similar in ccnstruction but consist
of two :nd -.r€ cabinet 'resF:cl'.'el:2. Basic operating
procer',trrc- ld components are the sarne for all three
types, but the numl-or arrar\peme.,., and mounting of.
li
; curnp( rent: ',lre alte- ,J to ftt trre space available.
^c" J"/ERALL F -ICTIOI{"-Tire Signal Distributfrr
Unit consists of twc sections, the ttadio Frequency
lRh and the Audio Frequ€r..-, (AF). Suitable monitoring
equipment is included.
I to mount 'f
r 'l space is i", *r"" iled -v permit ex-
- \al comp^.-.ent
?A " .1Uired. The
'fent furni hed coirrponents may be
' - iy su^:ply . rrce . proper auth-
,n
fD T nc RF section provid€s co', ction facilities for all
'- *fttennae of the station network. Ihe internal wiring
is such that "normal through" cirn' its from antennae
to statior: r eceivers andi or multr. plers are used.
Howe\zer, suitable panels and patchcords permit the
' op"#tion of any receiver or multicoupler from any
station l::rtenna. In addition, the normal signal source
to a re :civer inay be interrupted, and the signal obtainert
from a different source which may be either
a multicoupior or an antenna. A rotary antenna selector
.witch is provided which permits rapid comparison
of :, ntennae to determine the best input response for
a particul.rr signal by comparison of reception on variorrS
antc -,o.e of the network. The antenna selector
switc.h _il"V also be used to determine roughly the ,'
oR1,';lrvBt
bearing of a given signal or interlse noise source, provided
the antenna network coverage is sufficiently
large and the transmission lines have approximately
the same attenuation characteristics.
The AF section provides connection facilities for the
audio outputs of the station receivers. Direct 'normal
through" circuits connect the receiver outputs to their
normal loads. An arrangement of jack panels and
suitable AF patchcords permits the normal load circuits
to be switched so that any receiver can be connected
to any load with minimum interruption. Or,
if so desired, the normal load circuit of a receiver may
be connected to another load in parallel for monitoring
without interrupting communications. The interconnecting
terminal boards, in series between receiver
output terminal boards and connected load terminal
boards, furnish a means for making tempo rary or permanent
circuit connections to eliminate the use of
patchcords in permanent or semi-permanent circuits.
An audio frequenc;r selector switch with parallel connections
frorn the receiver output terminal boards is
used to tnonitor or rneasure any receiver output circuit
without interrupting connections.
Patchcord switching enables the operator to set up
circuits other than the "normal through" circuits as
desired. However, since the needs of individual stations
differ, the system must be adapted to the specific
case.
RESTRICTED
d. FEATURES.-In each type of the Signal Distribution
unit, provision is made for mounting Government
furnished equipments which may be used to
measure frequency, insulation resistance, volume level,
voltage, and current, and provide visual and aural
monitoring. The Signal Distribution units are wired
for a 1r5 volt AC power solrrce. Switch panel AN
Typ" SA-r34 / C mounts in the rear of each cabinet to
serve as a fused primary power line control. Each
cabinet contains convenience outlets on the front and
rear, a strip outlet with a common ON-OFF Switch
for electrically operated components, and a trouble
light. A writing shelf and a dual utility speaker
panel are included for use by the operator.
The Typ" A unit provides space for a Navy Model
RBC Radio Receiver with Power Supply Unit Navy
Type CRV-20130 for 1L0/rL5/rz0 VAC operation.
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