User's Manual

300-Watt Digital UHF Transmitter Chapter 5, Detailed Alignment Procedures
DT830A, Rev. 1 5-10
Table 5-6. Jumper Configurations for the Symbol Generator Board
REFERENCE
DESIGNATOR
FUNCTION SETTING
J5
19.39M/2.42M clock select:
Used for test purposes only.
1-2 selects 2.42 MHz, 2-3
selects 19.39 MHz
No jumper required
J8
/DPWEN, 2.69 MHz clock
select: Used for test purposes
only. 1-2 selects 2.69 MHz,
2-3 selects /DPWEN clock.
No jumper required
J11
10.76 MHz/32 MHz clock
select: Used for test purposes
only. 1-2 selects 32 MHz, 2-3
selects 10.76 MHz.
No jumper required
J23 External Reset No jumper required
J24 Spare Input No jumper required
J26
Impulse Select: Used for test
purposes. 1-2 applies the
output of the ATSC EPLD to
the linear equalizer. 2-3
applies repetitive impulses to
the equalizer so that the user
can observe the impulse
response of the equalizer.
1-2 is the setting for normal
operation.
J27
Rounding Enable: 1-2
enables the rounding on the
linear equalizer. 2-3 disables
the feature.
1-2 is the setting for normal
operation.
J28
Gain Select for the linear
equalizer: 1-2 forces the
linear equalizer to use the
gain set by the DIP switch 2.
2-3 allows the linear
equalizer to use the gain set
by the microcontroller.
2-3 is the setting for normal
operation.
J29
Clip Reset: Resets the clip
detector in the linear
equalizer. 1-2 allows the clip
detector to reset itself. 2-3
holds the clip detector in
constant reset.
2-3 is the setting for normal
operation.
SW1
8-position DIP Switch: Used
for testing. Position 1 has a
dual function. It can establish
the relationship between the
clock and the data on the
incoming MPEG source when
the TTL or ECL interfaces are
used.
Position1: Off when the data
changes on the falling edges of the
incoming clock. On when the data
changes on the rising edge. Off is
the normal setting
Positions 2-8: All positions should
remain off during normal
operation.