Each of these four data streams is called an IF . This operation takes less than 30 seconds. A 200 kHz bandpass is also available in spectral line mode. Continuum mode users wishing to use the 200 kHz bandpass should first consult VLA staff. Different bandwidths can be used for each of the two separate frequencies.
Wider bandwidths provide better sensitivity, but also increase the chromatic aberration.
Refer to Section 3.4.2 for details. By mid-2000, approximately half the antennas had been modified, and it is expected that this upgrade will be completed by the end of 2000. Testing of this new observing mode will begin shortly. Contact Ken Sowinski for information. The VLA correlator has two basic modes, Continuum and Spectral Line .