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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Patrick Kidwell (pkidwell@teleinc.com )
Organization:Tele-Consultants, Inc.
Date posted: Tue Nov 23 13:18:43 US/Eastern 2004
Subject: Naval Unsheltered Environment
Message:
In performing the reliability prediction for a Navy SATCOM program the question of what opeating enviornment should be used for an antenna that is housed inside a radome is in question. The radome does not provide any protection for temperature, but does appear to provide some protection from solar radiation (less heat), rain, salt spray, etc. In the Reliability Toolkit, Table A11-2 GF can be converted to NU by multiplying the value by 0.3. Is there another factor that can be used for partial protection from the environment to cover this design application?


Reply:

Subject: ANT Behind RADOME
Reply Posted by: Joe Dzekevich (jdzekevich@ieee.org )
Organization: Raytheon
Date Posted: Tue Nov 30 12:40:06 US/Eastern 2004
Message:
I would consider setting the environment to Ns (Naval Sheltered). The antenna is protected from the outside elements. To take into account its temperature, use the normal PiT value for whatever the temperature is within the radome. Joe


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