High Frequency Technical Details
General Q (7 mm) and K (1.3 cm) band issues
Q & K band receiver performance Plots of To for K and Q band receivers.
Q band (7 mm) log information Q-band antenna history information.
K band (1.3 cm) log information K-band antenna history information.
Detailed engineering data SOIDA plots, photos etc.
Antenna pointing results Chris Carillis latest pointing results
The VLA Q and K band team Staff email addresses

General Q and K Band Issues:

  • 12feb03 -- 23 new K-band and 26 Q-band receivers are now available.
  • 31oct02 -- 22 new K-band and 26 Q-band receivers are now available.
  • 28aug02 -- Current results on the leakage repairs.
  • 06aug02 -- The leakage repairs on the new receivers appears to have worked so far, even though we are not through the wet season yet.
  • 25july02 -- Since the leakage repairs started, there have been a few problems with Tcals, resulting in too high values of Tsys for a few antennas. Therefore, be aware that the system temperature shown in the plots below for K-bands are not true ones. This problem has now been fixed.
  • 28may02 -- 20 new K-band and 25 Q-band receivers are now available.
  • 20jan02 -- 18 new K-band and 25 Q-band receivers are now available.
  • 20jan02 -- The new K-band feed horns still suffer from water during wet weather. Leakage tests have been performed, and the plan is to install o-rings in all sections plus add sealant in all new K-band receivers during the spring.
  • General issues history file.

Frequency Usage:

  • Frequency Usage Summary at Q band for 1996 - 1999 ps file, gif
  • Frequency Usage Summary at K band for 1996 - 1999 ps file, gif

Receiver performance (measured To):

To is the system temperature due to all sources except the atmosphere (atm has been subtracted using tipping scan data). It includes receiver temp, sidelobes, etc. Subtract about 10 K obtain an estimate of the actual receiver temperature.

These charts are available as postscript or gif images. Note: some of the postscript files are quite large (40m+) and will take even a good connection a while to download.

Q-Band
ANT 2005 2004 2003 2002 2001 2000 ANT 1999
1-4 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif 3,4,6,8 ps, jpeg
5-8 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif 11,12,13,14 ps, jpeg
9-12 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif 16,18,19,20 ps, jpeg
13-16 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif 21,22,25,27 ps, jpeg
17-20 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif
21-24 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif
25-28 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif

K-Band
ANT 2005 2004 2003 2002 2001 2000 1999
1-4 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif ps, jpeg
5-8 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif ps, jpeg
9-12 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif ps, jpeg
13-16 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif ps, jpeg
17-20 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif ps, jpeg
21-24 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif ps, jpeg
25-28 ps, gif ps, gif ps, gif ps, gif ps, gif ps, gif ps, jpeg

NB: Tsys shown in the 2002 and onward plots are not to be taken as absolute Tsys values due to some Tcal problems during the spring. Fixed as of July 25 2002.
Modified on Friday, 26-Sep-2008 12:09:11 MDT by Ylva Pihlström