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SideBand - Indicates which sideband a dual sideband spectrum represents

Description:
This attribute indicates whether the DSBSpecFrame currently represents its lower or upper sideband, or an offset from the local oscillator frequency. When querying the current value, the returned string is always one of "usb" (for upper sideband), "lsb" (for lower sideband), or "lo" (for offset from the local oscillator frequency). When setting a new value, any of the strings "lsb", "usb", "observed", "image" or "lo" may be supplied (case insensitive). The "observed" sideband is which ever sideband (upper or lower) contains the central spectral position given by attribute DSBCentre, and the "image" sideband is the other sideband. It is the sign of the IF attribute which determines if the observed sideband is the upper or lower sideband. The default value for SideBand is the observed sideband.
Type:
String.
Class Applicability:
DSBSpecFrame
All DSBSpecFrames have this attribute.


next up previous 264
Next: SimpFI - Forward-inverse MathMap pairs simplify?
Up: AST Attribute Descriptions
Previous: Seed - Random number seed for a MathMap

AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 210
R.F. Warren-Smith & D.S. Berry
24th May 2011
E-mail:ussc@star.rl.ac.uk

Copyright (C) 2009 Science \& Technology Facilities Council