The 5 cm primary focus receiver has
got a new frontend-switch
(Switch 11), which gives the possibility
to
put an additive attenuation of about 10 db in the frontend. That is
intended
for observations of very strong Maser-lines in its passband, which can
overload the amplifiers. This can be set by the normal OBSE-commands
SET
SWITCHES_l or SWITCHES_C. In order to make it a bit easier I introduced
some OBSE-symbols for that receiver. The switch number 9 regulates the
strength of the calibration signal:
SW11ON =
switch
11 ON and switch 9 ON
(attenuation ON and LOW calibration
signal)
SW11OFF =
switch
11 OFF and switch 9 ON
(attenuation
OFF and LOW calibration signal)
SW11ONHIGH = switch 11
ON and
switch 9 OFF (attenuation ON
and HIGH calibration signal)
SW11OFFHIGH = switch 11
OFF and
switch 9 OFF (attenuation OFF and
HIGH calibration signal)
Beside setting the switches for
continuum and line
observations the frequencies are set to LSB (lower sideband) using
these
commands.
