DT-4500 Series C- and Ku-Band Down Converters
MN/DT4500.IOM
Front Panel Operation
Revision 2
6–9
Next, use the
keys to set
Rx
(down converter operation) as
On
or
Off
. The
default mode is
Off
. Press
ENTER
.
6.2.3.1.1
(CONFIG:) OUTPUT Submenu (OPTIONAL DUAL IF RACK
MOUNT CONVERTERS)
Comtech EF Data provides the ability to switch the output IF frequency between
70 MHz and 140 MHz. For converters equipped with this optional hardware
configuration, the
(CONFIG:) OUTPUT
submenu appears as follows:
Frq=03627.125 MHz IF=140
Atten=02.00 dB Rx = Off
On the top line, press the
ENTER
key to set the converter
RF
Frq
(Frequency).
You may edit the current frequency channel from RF
Low
to RF
High
MHz (e.g.;
10950.000 to 12750.000 MHz for Model DT-4513) in 125 kHz steps (1 kHz steps
optional). Use the
keys to select a digit, and then use the
keys to
change that digit.
Next, set the converter
IF
Frequency. Use the
keys to jump to this setting,
and then use the
keys to select
70
MHz or
140
MHz. The default is
70 MHz
.
On the bottom linescreen that follows, set the converter
Atten
(Attenuation).
You may select an attenuation setting from
0.00
to
25.00
dB in
0.25
dB steps (0.1
dB steps optional). The default setting is
10.00
dB. Use the
keys to select a
digit, and then use the
keys to change that digit. Press
ENTER
.
1)
The actual IF bandwidth is maintained as the standard ±18 MHz
(±20 MHz) of the 70 MHz configurations.
2)
The mute behavior after changing the IF frequency is the same as
the normal mute behavior after changing the RF frequency.
3)
You may not “mix” dual IF converters with standard converters
when operating in a redundant system.
