I’ve worked on dozens of different airborne and army ground-mobile RF
assemblies over my career, as well as poking my nose inside many pieces of
commercial RF gear. SMA connectors were everywhere. NEVER have I seen or heard
of any kind of sealant, overcoat, or anything of the sort on any SMA connector.
Above all, putting anything inside the threads is simply asking for trouble.
TORQUE IT PROPERLY and be done with it. A quality SMA connector is a
high-precision machined assembly and must be treated with care. See the old HP
application note AN-326. They are in fact vibration-resistant when correctly
installed. Proper torque is also mandatory to avoid well-known frequency
response aberrations in the mid-GHz range due to waveguide effects.
Of course, if your connectors are all crap and/or damaged, none of the above
applies...
Gary, NA6O
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