[IGSSTATION-4934] UNBJ (and UNB3/UNBN/UNBT) Antenna Change

[Richard B. Langley]

Author: Richard Langley

UNBJ's antenna was changed today from a Javad Positioning Systems Dual- 
depth Chokering Antenna (JPSREGANT_DD_E) to a Trimble Zephyr GNSS  
Geodetic II Antenna (TRM57971.00). The change was made to permit multi- 
frequency/multi-system observations with other receivers (UNB3/UNBN/ 
UNBT) that share UNBJ's antenna through a splitter. This is the first  
antenna change in UNB1/UNBJ's more than 10-year history.

The antenna switch occurred between about 13:45 and about 14:30 UTC.

Use caution with today's hourly and daily UNB RINEX files. Daily files  
will have mixed antennas. Some hourly files may have incorrect header  
information and those files will be subsequently replaced.

An updated site log file has been submitted to IGS CB.

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| Richard B. Langley                            E-mail:  
lang at unb.ca         |
| Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/ 
  |
| Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506  
453-5142   |
| University of New Brunswick                   Fax:      +1 506  
453-4943   |
| Fredericton, N.B., Canada  E3B  
5A3                                        |
|        Fredericton?  Where's that?  See: http:// 
www.fredericton.ca/       |
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