From fghigo@nrao.edu Mon Jan 5 09:07 MST 2004 Date: Mon, 05 Jan 2004 11:06:49 -0500 From: Frank Ghigo User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.2) Gecko/20021120 Netscape/7.01 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Vivek Dhawan CC: gbt , "analysts@aoc.nrao.edu" , cwalker , Walter Brisken , "Lorant Sjouwerman, NRAO" Subject: Q-band fringe test Content-Transfer-Encoding: 7bit X-MailScanner: Found to be clean, Found to be clean X-MailScanner-SpamCheck: not spam, SpamAssassin (score=-5.4, required 7, BAYES_01 -5.40, USER_AGENT_MOZILLA_UA 0.00), not spam, SpamAssassin (score=-5.4, required 7, BAYES_01 -5.40, USER_AGENT_MOZILLA_UA 0.00) X-MailScanner-Information: Please contact postmaster@aoc.nrao.edu for more information X-Lines: 26 We observed the fringe test for the 7mm receiver at Green Bank, (project code TG002). We were a little late starting the schedule because we didn't have the usual hour setup time. We were on the schedule at 06:28:40 UT, about half an hour late. We were initially unable to peak up on 3C84, but followed Glen's practice of going to K-band to find the pointing offset, then back to Q-band. We used the pointing correction (dAZ=+0.36', dEL=+0.21') for the whole run. Probably it would have been better to re-check the pointing a few times during the run. The weather was warm and the cloud cover increased and it started to rain during the run. System temperatures started at around 130K and got worse. It's not clear that the results are going to be very good. The tape will be shipped to Socorro today. Note that we have gain curve information about the Q-band system, which you can find in: http://www.gb.nrao.edu/~fghigo/gbtdoc/qband/qband.html note in particular Jim Condon's analysis of the Tsys and efficiency, in http://www.gb.nrao.edu/~fghigo/gbtdoc/qband/ptcspn31.pdf -- frank