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ON/OFF (Position Switching)

This is the standard procedure for basic spectral line observations at Arecibo. The procedure simply observes ON your source for x minutes and then takes a `blank sky' observation OFF your source for the same amount of time and tracking the same azimuth and zenith angle range. This is followed by recording your chosen noise diode configuration ON for 10s and OFF for 10s. This procedure will provide the simplest means to eliminate the standing waves in your baselines. These standing waves are due to the unique geometry of the Arecibo Gregorian system which allows for considerable reflection from sources inside and outside the beam.

Your choices with this procedure are:

Doppler correction options are described in Section 1.8, and the noise diode configuration options are described in Section 1.6.


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Next: Drift Map Up: OBSERVING PROCEDURES Previous: Cross Scan
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