DT-4500 Series C- and Ku-Band Down Converters
MN/DT4500.IOM
Serial Interface Operation
Revision 2
8–20
8.7.3
Configuration Commands / Queries
8.7.3.1
FRE (Frequency)
Use FRE to set or return the operating frequency. The default RF frequency of
the unit is equal to its minimum operating frequency (RF
LOW
).
Description
Details
Set Frequency:
<DEV/FRE_xxxxx.xxx{cr} where:
xxxx.xxx = Frequency in MHz (RF
LOW
to RF
HIGH
), in 125 kHz steps (1 kHz
steps optional)
EXAMPLE: 4500 to 4800 MHz for Model DT-4503/E (see Chapter 2.
SPECIFICATIONS for product-specific frequency ranges)
Confirmation:
>DEV/FRE_xxxxx.xxx{cr}{lf}]
Return Frequency:
<DEV/FRE_{cr}
Confirmation:
>DEV/FRE_xxxxx.xxx{cr}{lf}]
8.7.3.2
IFF (IF Frequency)
For units featuring the DUAL IF hardware option:
Use IFF to switch the output IF
frequency from 70 MHz to 140 MHz, or from 140 MHz to 70 MHz.
Description
Details
Set Frequency:
<DEV/IFF_xxx{cr} where:
xxx = Frequency in MHz, either 140 or 70. No leading zero is required.
Confirmation:
>DEV/IFF_xxx{cr}{lf}]
Return Frequency:
<DEV/IFF_{cr}
Confirmation:
>DEV/IFF_xxx{cr}{lf}] where xxx = Frequency in MHz, either 140 or 70. No
leading zero is required.
1)
The default selection is 70 MHz.
2)
The actual IF bandwidth is maintained as the standard ±18 MHz
(±20 MHz) of the 70 MHz configurations.
3)
The mute behavior after changing the IF frequency is the same as
the normal mute behavior after changing the RF frequency.
4)
You may not “mix” dual IF converters with standard converters
when operating in a redundant system.
