got a large portion of humble pie to eat!   Anybody got any catsup?
 
RG-400 is indeed double shielded.   BUT, that brown transparent coax I have looks like RG-400 and has an mil std number stamped on it, but is single shielded.  The tag attached to the coil says RG-400.   It's in the trash can now!  How bloody embarassing.
 
I took apart the short jumpers on my 450 Duplexer and, yep, double shielded. 
 
Not to old to learn
 
Roger Hansen, W6TOZ








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