User's Manual

300-Watt Digital UHF Transmitter Chapter 5, Detailed Alignment Procedures
DT830A, Rev. 1 5-12
Table 5-7. Jumper Configurations for the VSB Filter Board
REFERENCE
DESIGNATOR
FUNCTION SETTING
J2, J3
Impulse Select/Clock Select: Used for
board testing purposes. When both
are placed in position 2-3, the
impulse response of the I and Q
filters appear at the I and Q even in
the absence of any input to the
board.
Both should be set to positions 1-2
for normal operation
J6-J9
Jumper Blocks: Used during initial
integration and test.
No jumpers are required.
J10, J12
Gain Select: Selects between the gain
set by the microcontroller or the gain
set by the external settings. 1-2
selects external gain. 2-3 selects
internal.
Both should be set to positions 1-2
for normal operation
J11, J13
External Gain: Sets the gain of the
filters when J10 and J12 are in
positions 1-2. Gain is as follows:
J11 J13 Gain
1-2 1-2 1
1-2 2-3 2
2-3 1-2 4
2-3 2-3 8
Under normal operation, J11
should be 1-2 and J13 should be
2-3.
J14
Round: 1-2 disables the rounding
feature. 2-3 enables the rounding
feature.
2-3 is the setting for normal
operation.
J15
Twos Compliment: Enables twos
compliment data to be sent to the
D/As. Position 1-2 enables twos
compliment data.
2-3 is the setting for normal
operation.
J16
Clock Invert: Inverts the incoming
clock at J1. 1-2 inverts the clock.
1-2 is the setting for normal
operation.
J17
External Reset: Resets the symbol
generator card. Used for test only.
2-3 resets the board.
1-2 is the setting for normal
operation.
J19
I Clip Reset: Position 2-3 resets the I
clip detector.
1-2 is the setting for normal
operation.
J19
Q Clip Reset: Position 2-3 resets the
Q clip detector.
1-2 is the setting for normal
operation.
J25
I Data: Passes the data to the D/A
converters.
This jumper block is a dual-row,
12-location jumper block. Jumpers
should be placed on the top 10
rows in normal operation.
J28
Q Data: Passes the data to the D/A
converters.
This jumper block is a dual-row,
12-location jumper block. Jumpers
should be placed on the top 10
rows in normal operation.