Operator`s manual

npoint - Initiates a 25-point scan/map of the source selected. The map is 1/2 beamwidth
spaced and when finished displays a false-color, gaussian plot to the left of the
accumulated spectrum plot. (This plot will clear when the clear button is enabled). The
resulting maximum T
(ant) (with associated offset) is displayed under scan results in the
information sidebar. The color plot will NOT refresh if the SRT window is reduced then
refreshed.
bmsw - Initiates a continuous "off/on/off " beamswitched comparison observation of the
selected source at the frequency settings entered with "freq". The off/on/off
measurements are a set and are complimentary, meaning that the two off-source positions
switch sign within each set. The off-source measurements are spaced at +/- 1 beamwidth
in azimuth (offset = +/- beamwidth/cos EL). "BEAMWIDTH" is set in the srt.cat file
A left mouse click on the bmsw button after the scan has started will abort the
beamswitch operation.
Results of the bmsw observation appear in the left (red) spectral plot window.
freq - Sets the center frequency, number of frequency steps and the step width in MHz.
Clicking on the freq button prompts the user to enter the desired settings in the command
entry window.
Example (for the digital receiver):
To observe the hydrogen line at 1420.4 MHz, move the mouse pointer to the freq
button. Left click the button then move the cursor to the lower text input section
and enter:
1420.4 4 (4 = mode 4)
where:
1420.4 is the center frequency of an observation and 4 is the digital observing
mode. In this case, mode 4 = 3 x 500 MHz bandwidth with a 7.81 kHz spacing.
Example (for the old analog receiver):
1420.4 25 0.04 (0.04 MHz is the default)
where:
1420.4 is the center frequency of an observation that is 25 times 0.04 MHz wide
or spanning from 1419.9 to 1420.9 MHz.
offset - Enables the user to enter any az/el offset pair desired. Left click the offset button
and enter the offsets in the command entry box.
Usage:
Azimuth offset [Elevation offset], default sign is positive.