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Retrofit................To install new parts or equipment into an existing system.  
RF.......................Radio Frequency – Usually means the actual transmission of energy, e.g.  “The radio transmits RF”.
RTCA...................Radio Technical Commission for Aeronautics – Organization that makes recommendations for airworthiness. Refer to http://www.rtca.org/aboutrtca.asp for more information.
RTV.....................A rubbery silicon-based adhesive, typically used to prevent vibration problems and water intrusion.
STC.....................Supplemental Type Certificate – A type certificate (TC) issued when an applicant has received FAA approval to modify an aircraft from its original design.  The STC, which incorporates by reference the related TC, approves not only the modification but also how that modification affects the original design.
TSO.....................Technical Standard Order – The Federal Aviation Administration issues TSOs to indicate approval for use on aircraft of a manufactured item.
US.......................United States of America
VHF.....................Very High Frequency – A band of the radio frequency spectrum.  It is the frequency range from 30 MHz to 300 MHz.
VSWR..................Voltage Standing Wave Ratio – Electrical signals will “echo” back on the wire if the load impedance is not matched to the impedance of the wire.  The VSWR is a measurement of the amount of voltage being “echoed”, compared to the original signal.
 

 

　
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