05776-1198 <90-00124>
P
AGE
13
46105 D
UAL
VF 64K
B
C
HANNEL
A
LIGNMENT
P
ROCEDURE
Refer to Fig 9.
1.
To check the Audio Port Levels, other parts of the system do not
have to be functioning.
2.
Set the loopback (LPBK) switches for both channels to the ON posi-
tion.
3.
Remove power
4.
Install the module in the proper slot of the equipment shelf. (Slot 1)
5.
Apply power to the assembly.
6.
Insert a -16 dBm, 600-ohm signal of 1 KHz into the DROP XMT
jack for channel 1 on the front panel if the module.
7.
Using a 600-ohm, unterminated dB meter, read a level of 0 dB at
the blue front panel XMT LVL test points for channel 1. If the level
is not correct, adjust the front panel transmit potentiometer.
8.
Install a 600-ohm termination on the dB meter and connect the
meter to the DROP RCV jack for channel 1 on the front panel.
Verify a level of +7 dB. If the level is not correct, adjust the front
panel receive potentiometer.
9.
Insert a -16 dBm, 600-ohm signal of 1 KHz into the DROP XMT
jack for channel 2 on the front panel of the module.
10.
Using a 600-ohm, unterminated dB meter, read a level of 0 dB at
the blue front panel XMT LVL test points for channel 2. If the level
is not correct, adjust the front panel transmit potentiometer.
11.
Install a 600-ohm termination on the dB meter and connect the
meter to the DROP RCV jack for channel 2 on the front panel.
Verify a level of +7 dB. If the level is not correct, adjust the front
panel receive potentiometer.
12.
Turnoff the power.
13.
Remove the module and place the loopback switches in the OFF
position.
14.
Verify that the BRDG switch is in the RPTR position.
15.
Reinstall the module and turn on power.
16.
Insert a -16 dBm, 600-ohm, 1 KHz signal in the channel 1 DROP
XMT jack on the module’s front panel.
17.
Verify with the dB meter (not terminated) a level of 0 dB at the
front panel blue XMT LVL test points for both channels 1 and 2.
18.
Terminate the meter with 600 ohms and verify a level of +7 dB at
the front panel RCV DROP jack of channel 2.
19.
With the meter still terminated, verify the level at the front panel
RCV DROP jack of channel 1 is -40 dB or more negative.
20.
Move the input signal from the channel 1 XMT DROP jack to the
channel 2 XMT DROP jack.
ALIGNMENT PROCEDURES
CONTINUED
. . .
F
IG
. 9 - F
RONT
P
ANEL
, 46105
A11-44020-00 REV__
STROBE
CKT 2
O/1
GND
LEVEL
46105-00REV__
CH 1
XMT
RCV
SYNC
RCV
RCV
SYNC
GND
LEVEL
XMT
RCV
RCV
MON DROP
XMT
CH 2
MON DROP
XMT
RCV
46105-XX
DUAL VF
64B CHAN
