P
AGE
16
44118-0798 <90-00003>
STEP
19
20
21
22
ACTION
Move the signal generator to the LINE
RCV PORT 1 jack (J1) of module #2.
Reset for port 1 receive level, if
necessary.
Move the dB meter to LINE XMT ports
1, 2, 3, and 4 of module #1.
Repeat steps 19 and 20, moving the
signal generator to LINE RCV ports 2, 3,
and 4 of module #2.
Calibration is complete. Remove signal
generator and dB meter.
RESULTS
Read the system line transmit test tone level
(0 dBmO) for each port of module #1.
With each new LINE RCV port, read the system
line transmit test tone level (0 dBmO) at LINE
XMT ports 1, 2, 3, and 4 of module #1.
INSTALLATION
T
ABLE
D (
CONTINUED
) - E
IGHT
-W
AY
/ F
OUR
-W
IRE
B
RIDGE
A
PPLICATION
C
ALIBRATION
P
ROCEDURE
S
UMMING
AND
D
ISTRIBUTION
A
MPLIFIER
A
PPLICATION
Fig. 6 shows a summing and distribution amplifier application.
A signal received on the summing (common) port goes out the
other three ports, but the signal does not transmit through the
summing port.
A signal received at any of the distribution ports transmits
through the summing port, but does not transmit through the
distribution ports.
Fig. 7 shows a summing and distribution application using
multiple 44118 ADBs. Three interwired 44118 ADBs provide one
summing port and 11 distribution ports.
Refer to Fig. 3 and Table E for proper strap option installation.
Checkout
Table F provides the checkout and calibration procedures for a
summing and distribution amplifier. Use the following test
equipment for checkout (refer to Fig. 5 for a front panel view):
♦
Signal generator
♦
Two bantam jack test cables (a bantam plug on one end, and
a plug to fit the meter and generator on the other)
♦
dB level meter with 600-ohm termination
