Makes tradeoffs between tuning speed and phase noise.

Syntax

RFMXINSTR_ATTR_TUNING_SPEED

Numeric Value

Data Type

Access

Applies To

8

int32

Read/Write

Lo

Remarks

Note

This attribute is not supported if you are using an external LO.

For PXIe-5830/5831/5832, if you want to configure or read on LO1 or LO2 channel, use "lo1" or "lo2" as part of the selector string. You do not need to use a selector string or use "lo1, lo2" as part of the selector string if you want to configure this attribute for both channels. You can also use RFmxInstr_BuildLoString utility function to create the LO String. For all other devices, lo channel string is not allowed.
Note

This attribute is not supported on a MIMO session.

You do not need to use a selector string if you want to configure this attribute for all signal instances. Specify the signal name in the selector string if you want to configure or read on that signal instance. Refer to the Selector String topic for information about the string syntax.
Note

The PXIe-5830/5831/5832/5840/5841/5842 supports only Medium for this attribute.

Default value: Normal for PXIe-5663/5663E/5665/5668, Medium for PXIe-5644/5645/5646 and PXIe-5830/5831/5832/5840/5841/5842

Supported devices: PXIe-5644/5645/5646, PXIe-5663/5663E/5665/5668, PXIe-5830/5831/5832/5840/5841/5842

Name

Value

Description

RFMXINSTR_VAL_TUNING_SPEED_NORMAL

0 (0x0)

PXIe-5665/5668: Adjusts the YIG main coil on the LO for an underdamped response.
PXIe-5663/5663E/5644/5645/5646: Specifies that the RF downconverter module uses a narrow loop bandwidth.

RFMXINSTR_VAL_TUNING_SPEED_MEDIUM

1 (0x1)

Specifies that the RF downconverter module uses a medium loop bandwidth. This value is not supported on PXIe-5663/5663E/5665/5668 devices.

RFMXINSTR_VAL_TUNING_SPEED_FAST

2 (0x2)

PXIe-5665/5668: Adjusts the YIG main coil on the LO for an overdamped response. Setting this attribute to Fast allows the frequency to settle significantly faster for some frequency transitions at the expense of increased phase noise.
PXIe-5663/5663E/5644/5645/5646: Specifies that the RF downconverter module uses a wide loop bandwidth.