Comtech EF Data DT-4500 Series - Manual (Page 54)

DT4500 Series Down Converters MN/DT4500.IOM
System Operation Revision 1
36
3.3.2 C
ONFIGURATION
F
UNCTIONS
M
ENU
The Configuration Functions are as follows:
3.3.2.1 F
REQUENCY
O
PERATING
M
ODE
Frequency (FREQ):
Displays the current converter frequency in MHz, and allows the selection of a
new frequency channel between RF
Low
to RF
High
MHz (e.g.; 10950.000 to
12750.000 MHz for Model DT-4513) in 125 KHz steps through keypad inputs.
Attenuation (ATTN):
Input and displays the converter attenuation setting which is selected between
0.00 to 20.00 in 0.25 dB steps. The default setting is 10.00 dB.
Rx: The converter is ON or OFF. The default mode is OFF.
3.3.2.2 E
XTERNAL
R
EFERENCE
External Reference:
The External Reference is displayed only when the 5 or 10 MHz external
reference input to the converter is present.
3.3.2.3 E
NTRY
M
ODE
/COLD S
TART
The entry mode is Local or Remote. The default is Remote.
COLD Start:
The COLD Start Mode, if enabled, mutes the converter output signal for a pre-
determined time, 15 minutes, after power is applied to the converter to ensure that
the reference oscillator is stable. The default mode is Disabled. This function is
disabled in redundant systems.
3.3.2.4 F
AULT
R
ECOVERY
Fault Recovery:
Fault Recovery is Manual or Auto. The default is Auto.
3.3.2.5 R
EDUNDANCY
M
ODE
Refer to Appendix A, Redundant System Operation.
3.3.3 P
RE
-
SELECT
F
UNCTION
M
ENU
3.3.3.1 D
ISPLAY
P
RE
-S
ELECT
Displays the frequency and attenuation pre-selects for the converter. One (1) to thirty-
two (32) frequencies can be pre-selected. If no frequencies have been pre-selected, the
LCD display will indicate "NONE".