6 Input/Output
6.2 Input
<port> Input
RFFD
RFIO FD
RFHD
RFIO HD, Half Duplex
Example
:FEED:RF:PORT RFIN
:FEED:RF:PORT RFFD
:FEED:RF:PORT RFHD
:FEED:RF:PORT NONE
Notes RFIN sets the RF input to be the RF Input port, labeled RF Input
RFFD sets the RF input to be the full duplex port, labeled RFIO FD. Note that Option “FDX” is required to
enable this port
RFHD sets the RF input to be the half duplex port, labeled Half Duplex (M9410A/11A/15A/16A) or RFIO
HD (M9420A)
M9410E/11E/15E/16E also has HD port, which is the HD port on M9471A module
NONE sets the RF In port and Half Duplex port (if HD Port is not set to RF Output) to connect to 50Ω
load, as shown below:
When using Source only, set RF Input to NONE to provide better isolation. When the input port is set to
NONE, an error appears in the status area:
Dependencies Option HDX is required to enable the Half Duplex (RFIO HD) port
You cannot set this port to be the input if it is already set to be the output. Attempting to do so generates
error message: “-221, Settings conflict; RF Input cannot be set to RFIO HD when RF Output is RFIO HD”
NONE is not available in VXT model M9420A
Preset
RFIN
Annotation Annotation in the Meas Bar reads as follows:
When input is RF Input: Input: RF
When input is RFIO FD: Input: RFFD
When input is RFIO HD or Half Duplex: Input: RFHD
When input is None: Input: NONE
2344 Spectrum Analyzer Mode User's &Programmer's Reference
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