Message-ID: From: "Kodak, Charles" To: IGSMAIL , Dave Stowers Subject: [IGSMAIL-3386]: GGAO/GODE Returns to operation Date: Sun, 3 Jun 2001 08:16:32 -0400 Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 15 Jun 12:45:38 PDT 2001 Message Number 3386 ****************************************************************************** Author: Chuck Kodak The GODE antenna work at GGAO was completed shortly after 1900UT on Friday the 1 June 2001. SNR's peaked in the 750's when viewed on the AO/ACT Receiver, 80-99 on the Z-12. The work did not go as well has we had hoped. In the pre-work message it was stated antenna Sn. 129 would be replaced with Sn. 982. This DID not take place as the diameter of 982 is a few mm larger than 129 and would not set into the centering groove of the GODE mounting fixture. Instead we opted to make the amplifier change to Sn. 129. When we opened the old antenna to make the modification we noticed the Bandpass filter located between the patch element and amplifier. We believe this to be one of the major problems with this antenna and high SNR's. The entire modification took about 1.5 hours to install, this included the time to remove it new amp. and hardware from the 982 antenna. Please have analysts look at the data from the ACT, Z-12 and Z-18 and comment on performance. Thanks Chuck Kodak