The time estimate includes time spent on the reference position
(Position and Beam Switching) or the reference phase (Frequency Switching)
excluding overheads. Add 15% on top of the calculated time for
calibrations, pointing, antenna slewing and data handling. Projects
requiring frequent frequency changes of the SIS-receiver should allow 15
minutes for each tuning. Frequency changes within each of the three
HEMT reciever bands are instantaneous; OSO staff members are required
to change between bands. Such changes take about 30 minutes and are
done daytime.
      Note that the default temperature scale is in
T*A units. To use the main beam brightness
temperature scale (TMB) enter the required sensitivity
divided by the main beam efficiency.
      Simultaneous observations of right
and left circular polarizations are possible for the HEMT receiver bands 18-26 GHz and
36-49.8 GHz. Note that the calculated time applies to a single polarization, i.e.,
divide the calculated time by a factor of √2 when using both channels simultaneously, provided
that the signal is unpolarized or linearly polarized.
Measured receiver temperatures (80-130 K) for the new SIS receiver for 85-116 GHz has been adopted in the calculator.