Measurements of the lbw cal

28mar03

     Measurements of the lband wide cal. The column with CurValues contains the current cal values.
 

date measurement in use
28apr16
Used  sky and absorber, tracked blank sky
28apr16 ->
current
installed 21jul16
28jun12
Used sky and absorber. Tracked blank sky.
PolA calvalue had changed (proabably on 07feb12). First use of mocks for Tsys.
07feb12 -->27apr16
installed 12aug12
08dec08
used sky and absorber.Trked blnk sky.
Re did 26sep08 measurements because polA was way off.
05sep08 thru -->07feb12
installed 15dec08
26sep08
used sky and absorber.Trked blnk sky.
After dewar had been warmed up and the bias voltage bulkhead cable was replaced.
05sep08 thru 15dec08
replaced by 08dec08
installed 26sep08
29aug08 used sky and absorber.Trked blnk sky.
After tightening cal cables 14apr08 and dewar warmup of 29apr08 (replacement of polB amp L128->L127).
We don't have cal data for 14apr08->29apr08..
30apr08 thru 29aug08
installed 29aug08
22apr07 used sky and absorber.Trked blnk sky. No rdrBlanker.
After omt bolts tightened.
01apr07 thru 14apr08
installed 02apr07
06jul06 used sky and absorber. radar blank and trked blnk sky
After polB sma dewar feed thru for cal in dewar fixed.
16jun06 thru
01apr07
installed 31sep06
23feb06 used sky and absorber
radar blanking , and tracked blank sky
This was after diode 2 jumped on 06nov06
04dec05 thru
15jun06
installed 28feb06
23nov05 used sky and absorber
radar blanking , and tracked blank sky
This was after the new cal diodes were installed.
23nov05 thru 
03dec05
installed 28nov05
10jun05 used absorber and sky
radar blanking,tracked blank sky
After polB cal cable repaired. Fit to entire receiver band
01jun05 thru
22nov05
installed 21jun05
06aug04 used absorber and sky. 
Radar blanking on for both.
Tracked blank sky.
PolB cal started drifting on 24apr04.It stabilized around 4jun04.
04jun04 thru 
31may05
06mar03 used absorber and sky.
Radar blanking on for both. 
Tracked blank sky
17feb03 thru
03jun04

Note: The original lband wide receiver was replaced on 17feb03 with the new receiver.

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