> The material in the ARRL Handbook is woefully out of date and quite
> inadequate.
I'm not sure if "out of date" is exactly right in this context (neither the
coax nor the theory changed, did they?), but I believe you are right that
air would coax chokes are inadequate for HF. OK for VHF, maybe for the
upper HF bands too, but not as a general HF band choke. Not nearly enough
impedance to choke off common-mode currents.
There was an email thread about this on one of the many other email lists I
subscribe to, saying pretty much the same thing. To be effective at HF, one
must use some ferrite core(s) to make an effective choke.
Andy
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