cal diode calibration

mar,2004

    Cal diode calibration is done on the antenna test range using a hot load and sky. It is also done on the telescope using absorber (hot load) and sky. This page points to some (but not all) of the calibrations done for the diodes.


Sections:

General informaion
cals by receiver
miscellaneous
history
Notes:


General information: (top)


Cals by receiver:  (top)


Miscellaneous:  (top)


History:  (top)

    The table below summarizes the last cal measurements, and any noted changes in tsys after this.

rcvr
lastMeasured
YYYYMMDD
Notes
327
20080608
New cooled rcvr installed. ganesh measured cals with noise figure meter. We can't use the sky absorber for this (too big).
430
dome
200101xx
measured by bill genter.
2006 new turnstile installed
aug13 - turnstile damaged. old turnstile reinstalled (with mods)
430
ch
20050927
Used network analyzer in the carriage house.
800
20090913
no longer installed
*lbw
20120628
apr16: cal values jumped after return from platform painting.. need to remeasure.
alfa
20040904
measured on telescope using sky and absorber
*sbn
20121116
new receiver installed
- aug13 new amps fried, installed sbh amps
-jul14   new chalmers amps installed
       after this tsys seems to jump around a lot. rfi ? or new amps
*sbw
20080926
18mar15 polB jumped up 5K
*sbh
20040309
aug13 amps removed and used in sbn
jul14 amps reinstalled
cband
20120628

cbh
20120612

*xband
20120612
2014 sep. pola jumps down by 3 K

* need to remeasure because of jumps or changes.


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