QM1004A-2-18 Combined RF Upconverter/Downconverter
User Manual
3.3 FREQuency:REFerence:DIVider <numeric value>
This command allows the user to set the QM1004A-2-18 LO1 reference divider value. The allowed
values are integers between 1 and 16383. The reference divider is used to set the resolution of the
tune frequency step size while operating in integer mode. The frequency step size in integer mode is
𝑓
𝑟𝑒𝑓
𝑁
*
𝑝𝑟𝑒𝑠𝑐𝑎𝑙𝑒𝑟
. In the QM1004A-2-18, the
𝑟𝑒𝑓 𝑒𝑟𝑒𝑛𝑐𝑒 𝑓 𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦
(
𝑓
𝑟𝑒𝑓
)
is fixed at 100 MHz and the
hardware
𝑝𝑟𝑒𝑠𝑐𝑎𝑙𝑒𝑟
is fixed at 8. This results in the integer mode tuning resolution being
800
𝑁
, where
𝑁
is
the reference divider value.
Note: Phase noise will increase as the reference divider value increases.
Syntax
:
FREQ
:
REF
:
DIV
Space
Numeric Value
?
Example
:FREQ:REF:DIV 8
This command sets the LO reference divider of the QM1004A-2-18
to 8
.
Default Condition
On power up, or when a
*RST
command is issued, the QM1004A-2-18 LO reference divider returns to
the boot state’s setting. The Combined RF Upconverter/Downconverter default setting is 1.
Query
:FREQ:REF:DIV?
This query returns the value of the QM1004A-2-18 LO reference divider.
Error Message
If the parameter is not in the recognized format, error
-102, "Syntax error"
occurs.
If the parameter is not between 10 and 250, error
-222, "Data out of range"
occurs.
Quonset Microwave
Revision 1.4.3
41
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