DAC1 USB
Instruction Manual Revision D
Page 51
BNC Input Termination (JP7):
The BNC (Coaxial) input has a 75-Ohm
internal termination that may be disabled by
removing the 2-pin jumper at JP7 (see Photo
2). This termination is required for normal
operation, but may be removed if the user
wishes to loop a single coaxial feed through
several other pieces of equipment (using a
BNC ‘T’ adapter on the
DAC1 USB
). A 75-
Ohm termination must be applied at the last
device on the loop, and there should be a
combined total of less than 6 feet of cable
between the first and last receive device.
JP7 should be configured as follows:
•
75-Ohm Input Impedance*** (Jumper
Installed)
•
High-Z Input Impedance (Jumper
Removed)
*** = Factory Default
Photo 2 - BNC Input Termination (JP7)
XLR Output Pad Selection (P4, P5,
P6, and P7):
One pair of 8-pin headers controls the output
level at each XLR jack as follows:
•
0 dB - (Attenuator disabled) – (Jumper
plug between pins 1 and 2 of each
header)
•
-10 dB – (Jumper plug between pins 3 and
4 of each header)
•
-20 dB – ***(Jumper plug between pins 5
and 6 of each header)
•
-30 dB – (Jumper plug between pins 7 and
8 of each header)
*** = Factory Default
Photo 3 - XLR Output Pad Selection (P4,
P5, P6, and P7)
Headphone Switch Disable (JP1
and JP2):
The left headphone jack can be configured so
that when a headphone plug is inserted into
the jack, the analog outputs are muted. This
is convenient when the user wishes to switch
between headphones and speakers.
JP1 and JP2 should be configured as follows:
•
Headphone Switch enabled*** (Jumpers
Removed)
•
Headphone Switch disabled (Jumpers
Inserted)
*** = Factory Default
Photo 4 – Headphone Switch Disable
(JP1 and JP2)
