[Elecraft] So today i learned about BNC-BP and red/black terminals

[Marshall Harrison]

No, that is not a convention. They should follow the black is ground and
red is hot but sometimes quality control isn't what it should be.

I always check to make sure since the colored tops can be easily swapped so
I don't trust them. The black/ground/shield side usually has a small tab or
something to identify it  as being connected to the coax shield.

*Marshall Harrison, *
*W4MKH*





On Mon, Aug 29, 2022 at 10:32 PM Bill Lederer <w8lvn.9 at gmail.com> wrote:

> Team:
>
> I have been using a wire out the window from my upstairs office for an
> antenna for my kx3. The wire goes to a tree about 30 feet away, so it is
> essentially a random wire.  I have an additional wire that goes to a ground
> rod one floor below.
>
> In doing some experiments with RBN and this combination with 5 watts, I was
> confused about why connecting the wire to the tree to ground through the
> BNC-BP and the ground wire to the hot side of the BNC-BP gave better
> results.
>
> Finally, I measured which was which, and discovered that the black plastic
> nut on this connector is actually connected to the center pin of the BNC,
> with the red being ground. This was certainly contrary to my expectations.
>
> I also have a kx2 and got one of these connectors along with that kit. And
> sure enough, it had the same convention--black is the center pin, red is
> ground.
>
> This is contrary enough to my intuition that I reversed the nuts, so now
> that the red indicates the center pin.
>
> Is this a convention that black is hot and red is ground with these?
>
> Thanks,
> w8lvn
>
> --
> --w8lvn--
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