Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.naic.edu/~phil/lbnSefd_G_TJun00.html
Дата изменения: Fri Jan 4 16:31:52 2002
Дата индексирования: Mon Oct 1 23:10:05 2012
Кодировка:
Поисковые слова: п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п р р р р р р р
|
Lband narrow SEFD, Gain, Tsys (daytime)
july,2000
The gain, system temperature, and
SEFD as a function of zenith angle were measured using correlator position
switching (with cal on/offs). The measurements were done in the daytime
during jun00 and july00:
23jun00 : J1120+143
30jun00 : J0329+279, J0431+206, J1021+219
06jul00 : J0521+166, J0840+132
12jul00 : J0318+164, J0521+166, J0840+132, J1120+143
The measurements were done at 1400 Mhz with a bandwidth of 25 Mhz.
The fluxes were taken from the NVSS survey. The plots have polA as
a dotted line and polB as a dashed line. They are:
-
The SEFD (system equivalent flux density) versus zenith angle. Some of
the polA values are high (see note (a) below). The solid line is the SEFD
measured in june of 1998.
-
The system temperature vs zenith angle (using 1.85, 1.91 Kelvins for the
cal values). The solid lines are the june 1998 Tsys scaled to the current
Tsys at za of 5 degrees.
-
The gain versus zenith angle in kelvins per Jansky using the flux
from NVSS and tsys measured using the cal. The solid line is the gain from
june 1998 scaled to the current gain za of 5.
-
The stability of the cals for each strip (calKelvins/(calon-caloff)). For
a given strip the attenuation was not changed so the cal difference should
be a constant.
(a). The receiver's cryogenics was warmed up and then cooled down during
the first part of july. After the cycle, the polarization A Tsys increased
by 4 degrees kelvin.
The plots can be found at:
versus za:
lbn
SEFD, gain, and tsys vs za (ps)
lbn
SEFD, gain, and tsys vs za (pdf)
versus azimuth:
lbn
SEFD, gain, and tsys vs azimuth (ps)
lbn
SEFD, gain, and tsys vs azimuth (pdf)
Processing: x101/lb/Aug00/lbnjun00/lbn.pro
plotting : x101/lb/Aug00/lbnjun00.lbnplt{az,za}.pro
home_~phil