Subject: [IGSSTATION-355]: AUCK proposed antenna change
From: John Beavan <[email-masked]>
To: [email-masked]
Cc: [email-masked], [email-masked]
Date: Wed, 2 Feb 2005 10:14:29 +1300 (NZDT)

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IGS Station Mail          01 Feb 13:14:39 PST 2005      Message Number 355
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Author: John Beavan, GNS

We plan shortly to exchange the ASHTECH Z-XII3 receiver at 
AUCK for a TRIMBLE NETRS. 

Should we leave the current Ashtech choke-ring antenna 
(ASH701945C_M) in place, or should we replace it with a 
Trimble Zephyr Geodetic antenna (TRM41249.00)?

Does anyone have useful data or opinions on this question?

In particular, does anyone have experience of data quality 
from a NETRS receiver with an Ashtech choke-ring antenna?

Whether or not we replace the antenna, we will run a nearby
receiver for several days before and after the AUCK receiver
exchange in order to calibrate any offset in apparent 
position of the station. 

(This same question will arise for station CHAT in due 
course, but this is not imminent.)

Thank you,

John