We have a 10m site, but because of high ambients, we calibrate and test at
3m. So, we have a very large ground screen for a 3m site. When we place the
transmitter on the table, we fail NSA. When we move the transmitter onto the
ground screen we pass. We can place the transmitter to the side of the table
on in front of the table as pass. Therefore, I conclude that we are not
experiencing reflections from objects near the OATS, nor do we have problems
with the screen or its connection to earth. The antenna and cable setup also
appears to be correct since we can pass off the table. It appears that our
1.5m table is the only unknown. We did find that the continuity between the
ring and the screen (a bolted pressure connection) had deteriorated
significantly. That is why we added the copper straps as a more permanent
connection method. There are eight short, wide copper straps around the 1.5m
table.
----------
From: [email protected] [SMTP:[email protected]]
Sent: Friday, July 16, 1999 4:00 PM
To: WOODS,RICHARD; "INTERNET[ <[email protected]>]"@anritsu.com
Subject: re: NSA
Richard,
Can you detail your procedure to the conclution: "The problem
appears to be
the turn table" ?
Barry
-------------
Original Text
From: "WOODS, RICHARD" <[email protected]>, on 7/16/99 12:28 PM:
Argh! For the first time in five years, our NSA is out of spec on
our 3
meter OATS at 30 MHz. The problem appears to be the turn table. We
can move
the equipment off of the table to one side or toward the front and
comply,
so it does not appear to be an off site reflection problem. We have
replaced
marginal brushes from the table to the ring and we have added wide
copper
ground strips from the ring (attached with screws) to the ground
screen
(soldered). Still won't pass. Suggestions?
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