> On Aug 26, 2016, at 7:56 AM, Paul Koning <paulkon...@comcast.net> wrote:
>
>
> That reminds me of an amusing error in a 1980s trade rag for DEC users ("The
> DEC Professional"). It discussed how you could mix 10Base5 and 10Base2 hosts
> by coupling the two size coax cables through an N to BNC adapter. That's
> fine so long as you use the 10Base2 limits. But instead of a barrel adapter,
> the article had a photo showing a T connector at the transition, with a
> "terminator" attached to it. So that network had three terminators: one at
> each end and one in the middle. I suspect it didn't work, or at least quite
> poorly.
Are you sure about that? I’m by no means an RF expert, but, for example, the
cable TV plant is a huge tree of cables and splitters. They advise that all
open sockets should have a 75 ohm terminator attached to them. Even this whole
mess with 75 ohm terminators everywhere, and the characteristic impedance of
the network is still 75 ohm. Remember this is AC impedance, not DC resistance.
Ian
