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XRX PCAS initial impressions

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dlm46007(at)cox.net
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Posted: Sat Dec 22, 2007 9:34 am Post subject: XRX PCAS initial impressions

I have flown a  couple of flights with both the MRX and XRX sitting adjacent on the panel. Some  observations: Traffic is certainly easier to spot given the relative bearing. In  the mountains, overflying Boeings strobed the transponder and provided  indications of traffic. I primarily use screen B on the unit; it provides a  God's eye view of top three threats and detail info on the top threat. The MRX  and XRX have slightly different threat algorithms. Aircraft aft of my aircraft  seem to given less weight in the threat analysis software in the XRX.  

  

 Two caveats: Be sure  and calibrate the magnetometer as the screen B display will be unintelligible  Also calibration can be done in flight setting the autopilot on a 000 GPS track  in smooth air.

 Wait until they  improve the connection cable. I found that the first XRX unit they sent  would shut off automatically intermittently. Although not conclusive at this  point I believe that the voltage drop on their very small power cable is causing  the power problems. They use the same power cable as the MRX which requires  20-25% of the power of the XRX. Although I have not determined the wire size,  the pin size for the connector is .7mm (.027 inch).  Although the specs say  that the XRX will run on any voltage from 10-40 VDC; the reality is that it  won't run on a 12VDC battery very reliably. Things go downhill rapidly if  the source battery supplies 11-12 VDC to the cigarette lighter adapter.   

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