7700 MultiFrame Manual
7700ADA6-EQ-L Equalizing Analog Video Distribution Amplifier with Loop Thru
Revision
1.2
Page - 7
6.
JUMPERS AND USER ADJUSTMENTS
J5
75R
J4
AC
DC
IN
P
U
T
J9
FLOAT
GND
SHIELD
J1
FRAME STATUS
ON
OFF
+12V
GND
GAIN
EQ CTRL
CLAMP LEVEL
MODULE STATUS
(1)7700ADA7
HD PRES
SD PRES
VIDEO HIGH
SYNC HIGH
SYNC LOW
J8
FAST
SLOW
CLAMP
J3
OFF
ON
CLAMP
J3
16
94
CABLE
82
81
Figure 6-1: LED and Jumper Locations
6.1.
SELECTING WHETHER LOCAL FAULTS WILL BE MONITORED
BY THE GLOBAL FRAME STATUS
The FRAME STATUS jumper J1, located at the front of the module, determines whether local faults (as
shown by the Local Fault indicator) will be connected to the 7700FR frame's global status bus.
FRAME STATUS:
To monitor faults on this module with the frame status indicators (on the power
supply’s FRAME STATUS LED's and on the Frame's Fault Tally output) install this
jumper in the On position.
When this jumper is installed in the Off position local faults on this module will not
be monitored.
6.2.
SELECTING THE INPUT TERMINATION
The input termination may be set via card jumper J5 to either 75 Ohms (default) or Hi-Z (34k Ohms). Set it
to Hi-Z when using the passive loop thru BNC connector to loop the signal through several device inputs.
"
To terminate the signal (for non-looping applications), ensure that this jumper (J5)
is installed in the 75Ohms position.
6.3.
SELECTING THE INPUT AC/DC COUPLING
The input may be AC or DC (default) coupled into the input-circuitry using jumper J4. Use AC coupling in
applications when the input signal has a large (>2V) DC level. In some non-video applications that do not
have DC information (i.e. digital AES audio), AC coupling can be used to remove any DC level that may
have built up in its transmission. The DC Restoring (clamp) circuitry will work with either AC or DC
coupling in video applications.