[IGSSTATION-3914] CRO1 - Receiver swap

[Victoria Andreatta]

Dear Colleagues,

We are happy to report that the St. Croix VLBA station (CRO1) has 
resumed normal operations.  Station maintenance issues of interest 
include a receiver swap, and the arrival upon a stable configuration 
with the frequency standard.  An updated site log has been submitted to 
the IGSCB.    There was unfortunately a data gap due to a failure of the 
data collection hardware which has also been replaced.  Data outage 
started May 23, 2010 (142) and ended on July 7, 2010 (188). 

3.9  Receiver Type            : ASHTECH UZ-12
     Satellite System         : GPS
     Serial Number            : IR2200722005
     Firmware Version         : CQ00
     Elevation Cutoff Setting : 4 deg
     Date Installed           : 2010-07-08T00:00Z
     Date Removed             : (CCYY-MM-DDThh:mmZ)
     Temperature Stabiliz.    : none
     Additional Information   : NEW ACROSSER PC,APC 750XL UPS, 2X1 
POWERED SPLITTER
                              : RCVR UV# 71315

6.7  Standard Type            : INTERNAL
       Input Frequency        :
       Effective Dates        : 2010-07-08/2010-07-14
       Notes                  : 25 dB ATTENUATOR REMOVED, NEW 10 db 
ATTENUATOR INSTALLED
                              : BNC CABLES REPLACED

6.8  Standard Type            : INTERNAL
       Input Frequency        :
       Effective Dates        : 2010-07-14/2010-07-19T17:00Z
       Notes                  : 10 db ATTENUATOR REMOVED 2010-07-14T13:03Z

6.9  Standard Type            : H-MASER
       Input Frequency        : 5 MHz
       Effective Dates        : 2010-07-19T17:00Z/CCYY-MM-DD

We apologize for any inconvenience this outage and maintenance may have 
caused.

Maintenance and operations of the CRO1 station is a collaborative effort 
supported by JPL, UNAVCO, and the National Radio Astronomy Observatory 
(NRAO) St. Croix VLBA Station, with funding provided by NASA's Earth 
Surface and Interior Focus Area - Science Mission Directorate.

Best Regards,
Victoria Andreatta