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I/Q Recording
This option enables the capture and recording of in-phase and quadrature components of a signal (I/Q
Data) in order to analyze those signals with other test equipment.
Note: The I/Q Recording option is only available in the Mode Settings Menu at spans of 14 MHz and
below. The circle around the sound icon will be gold when it is available. A trigger-based I/Q Recording is
also available on the MESA 2.0 (see page 35).
To record I/Q Data:
1. Set up the I/Q Recording using the configurations found in the IQ Recording Setup dialog (see
explanations below).
2. Press Start. The Start icon will be grayed out if the USB Drive is not inserted OR if the USB does
not have enough free space.
3. While the I/Q Recording is in progress, the screen is automatically locked to prevent changes to
the frequency span. An onscreen indicator provides progress information.
Three possible file types are available for the I/Q Recording files: iq-tar, idq (IRIS), & Raw.
iq-tar (default): a binary format that includes meta-information (e.g. sample rate) about the data.
The iq-tar container packs several files into a single .tar archive file. The iq-tar files can be read by
equipment that supports Rohde & Schwarz’s iq-tar format.
idq (IRIS): able to be read by the IRIS Spectrum Software available from Transformational Security
(www.powerfulsecurity.com).
Raw: Same as the iq-tar format but with no metadata nor any ‘tar’ packaging.
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