Date: Sat, 8 Dec 2018 18:43:36 -0500
From: <john@kk9a.com>
To: <topband@contesting.com>
Cc: <k3lr@k3lr.com>
Subject: Re: Topband: Rather use N-type (was Re: The answer to PL-259
<A BNC connector has a ?.050 pin and when mated properly an N connector has a
<.120 center pin.
<John KK9A
## front end of a BNC is the same diam and taper as a type N. The back end
of a type
N is bigger, to handle the larger center conductor of 213 U etc.
## There is NO RF flowing on the pin on any of these connectors ! The RF
flows on the
outside of the mating female... that the pin is inserted into. All the pin
is doing, is mating the
hollow female to the back end cylinder, that the center conductor terminates
to. The back end portion
is the same OD as the female...the 2 are butted together. Mean while the
pin is buried inside, invisible..with no RF on it.
## while you may well get away with using a BNC, with small coax, like
RG-400, RG-142, RG-303,
and RG-59 etc, on 160m, with 1.5 kw.... I would not use the BNC on the upper
bands with high power.
The V stand off is not there. I would not flood the inside of a type N
with dielectric grease. With 1.5 kw
and high swr, etc, the V breakdown through the grease, could easily cause
issues, then u get carbon tracks etc.
A tiny bit of grease on the center pin..and a tiny bit on the threads is fine,
and works good.
Jim VE7RF
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