[IGSMAIL-3386]: GGAO/GODE Returns to operation

[Kodak, Charles]

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IGS Electronic Mail      15 Jun 12:45:38 PDT 2001      Message Number 3386
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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