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2 Section
Porogroph 2 b
NORMAL
CIRCUIT
LOAD
CLEARED
PARAL LEL
PATCHING
LOWER JACKS ]
RIGHT
LEFT
LEFT
RIGHT
MISCELLANEOUS APPARATUS
wlRrNG coNvENTloN LEFT
NORMAL
CIRCUIT
SIGNAL
CLEARED
(7)
RIGHT
LEFT
PARALLEL
PATCHING
LOWER JAGKS
f RIGHT
UPPER JACKS
PANEL
RECEIVER
A F LINE
UPPER JACKS
LOAD CIRCUIT
LINE
Figure 2-21 . Wiring Convention, AF Section
NAVSHTPS 9rO47
INSTA}"LATION AND
OPERATION
For measuring an incoming frequcrrr^.1'.". uurrrlect an RF
patchcord from the RF COUPLIN{.1 l;.i che LM-I5a tr;
the appropriate jack on ]ack PaneJ ,i.l\ "i'Ipe I-2381r;.
To calibrate a receiver, connect an RIr patchcord fl ;:n
the RF COUPLII{G on the LM-I5a to tr.' appropriate
jack Switch on Jack Panel AN Type !-2L'-,,/G.
c. OPERATING PROCEDURE AF SPICTION,--
The audio section of the Signal Distributior 'init lrsists
of terminal boards and ]ack Panels sirnilar to a
telephone switchboard connecting the receiver outputs
to the desired loads. Provision is made for testing and
monitoring.
(1) "NORMAL TIIROUGH" OPERATION.-As
in the RF section, "normal through" circuits are provided
so that a receiver may be operated from its normally
connected load without patching. The AF section
differs in that the "normAl through" circuits may
be readily altered by flexible leads between the Interconnecting
Terminal Boards. "Normal through" operation
should be used wherever possible, but it will
probably be necessary to depart from normal procedure
more often than in the RF section.
supervisor to analyze a signal on the monitor receiver
with the test equipment provided.
(7) FREQUENCY METER.-AII sizes of the Signal
Distribution Unit include frequency meters which
are furnished by BuShips. The frequency meter may
be used to measure the frequency of a certain specific
signal which is being received on one of the station
antennae or any other RF Signal which is within its
frequency range.
In the Types A and B Units of the Signal Distribution
System, a Frequency Meter Navy Model LR-l is
included (motrnting rack AN Typ" MT-S7L/G only
furnished by contractor). Jack Panel AN Typ"
J-265/G, which is included for connection to the Frequency
Meter, has two jacks which connect by short
patchcords to similar jacks on the Frequency Meter
marked RF OUTPUT. These jacks, in turn, are connected
to jacks on Jack Panel I-237 /C. To calibrate
a receiver, connect an RF patchcord from the appropriate
Jack Switch on Jack Panel AN Typ" I-239/G to
the jack on Jack Panel AN Typ" J-237/C which connects
with the RF OUTPUT on the Frequency Meter.
For more complete information on the use of the LR-l
refer to LR-l Instruction Book (unnumbered).
In the Typ" C Unit of the Signal Distribution Syttem,
a Frecluency N,{eter Navy Model LM-I5a (modified
for rack mountittg) is substituted to save space.
Jack Panel I-265/G is omitted as the Frequency Meter
is close enough to the regular RF jack panels to be
patched in directly. On the LM-15a, there is only one
jack marked RF COLTPLINC rather than two jacks.
RECEIVER OUTP UTS FROM
CONTROLS AN TYPE C.443/G
og g 9 0 g o 9 9
^o (' o
-o o o o o o o o
LOAD CIRGUITS
RECEIVER OUTPUT T. B
AN TYPE J-242/G
RECEIVER OUTPUT JACK PANE L
(JACK MOUNTING STRIP N.T. -
49t394)
INTERC ONNEGTING T B.
AN TYPE J-242/G
FLEXIBLE LEADS
INTERCON N E CTING T. B.
AN TYPE J-242.lG
MISG. APPARATUS JAGK P' NEL
IJACK MOUNTING STRIP
49t394)
MISG. APPARATUS :
AN TYPE J-242/G
Figure 2-22. "Normql Through" Operution, AF
Section
2-22
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