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The MBTS injected test target is not visible on the Control receiver when calibrating receiver sensitivity.

Intermittent Synthetic Target failures.

Loss of power to standby SIU causes loss of data to the ARTCC:

Due to the wire OR connection between SIU A and B and the design of the SIU's, when the STANDBY SIU is powered off the ONLINE SIU will not output data.  To avoid a service outage the serial cables going to the STANDBY SIU should be disconnected before the standby SIU is powered down.

Resetting SRTQC runlength:

The SRTQC runlength is usually set to 64.  To reset do the following:

• Verify the following in Transparent Mode:

  DP35 4 = 0200    **The first 2 bits (02) set the runglength to 64.  The last 2 bits (00) set the time in storage to 0.**

  PS4ON **Type DPS10 in Transparent Mode and look for index 4**

  PS86ON  **Type DPS4 in Transparent Mode and look for index 86**

• Notify the center that they will lose PSR data for a few scans

• In the communication cabinet, remove the PSR/CD2 Input cable

• Monitor the CMS. The PSR/CD2 line should go red after a couple scans

• Reconnect the PSR/CD2 Input cable

• All alarms should clear on the CMS

• At your local WRTADS (v5.2 or v5.3) go to Text Mode and look for the following line

  

WRTADS v5.1 or earlier may not report the proper runlength.

• Call the center to verify that the runlength is now being reported properly.

MBTS test target on the Control receiver:

The OCS program has a default Sum/Omni ratio of 20dB.  Therefore, the Control power will be 20dB below the Sum power.  Change the Sum/Omni ratio to 0dB when calibrating receiver sensitivity.

Synthetic Target Failure:

It is believed that intermittent synthetic target failures are due to live traffic flying in the expected vicinity of the synthetic target.  To fix this the synthetic target should be placed outside of the BI-6 Range Listening Interval (RLI).  For most sites this is 200nm.  For Alaskan sites this is 250nm. 

The following parameters have been used at several 200nm sites to eliminate the failures.  The site TMC file should be edited to reflect these values.  Sites with a max range of 250nm should use the system default values.

Tips for loading software onto the Plot Extractor:

• Downtime for the site should be coordinated with Air Traffic prior to loading software onto the Plot Extractor card.

• Always use an ESD wrist strap when handling the Plot Extractor or any other circuit card in the system.

Turning off Mode-S:

A Maintenance Alert was issued on 6/1/2006 instructing BI-6 sites to stop interrogating Mode-S.  Instructions for doing this are included in the alert.  Go to TechNet for a copy of the alert.

Mike Monroney Aeronautical Center

6500 S. MacArthur Blvd. Bldg. 217

Oklahoma City, OK  73169