On 06/11/2020 22:43, Brian Morrison wrote:
On Fri, 06 Nov 2020 20:38:46 +0000, The Natural Philosopher wrote:

On 06/11/2020 18:10, Brian Morrison wrote:
On Fri, 06 Nov 2020 15:46:20 +0000, The Natural Philosopher wrote:

A galvanic isolator is a way to prevent corrosion in boats. WTF is one
doing in a Broadband setup?

It is used to disconnect the internal equipment from the external
broadband cabinet and equipment. It also acts to prevent ground loops
via the coax cable that supplies the cable broadband signal. It might
be what everyone else calls a braid breaker.

Gosh. Ground loops. 50hz hum on a megahertz signal...Do you folks over
on uk.radio.amateur actually have *any* electronic experience *at all*.?

Quite a lot actually, professional RF engineer for 40 odd years here.
Coupling between different signals can be problematic, I assume that the
cable people have a whole variety of kit to fix these issues. Jim has had
a fairly long time with the same ISP I think, so he may have a relatively
old installation that is a bit more sensitive to the exact topology
around and inside his house. It's not easy when you are constrained in
what can be fitted, cable internet is quite after-market in nature
certainly 25 years ago when a lot of it was initially fitted.


Putting it in the 'wrong' position might cause a change in SNR, that
depends on exact details of the property and wiring.

Jim clearly upset it initially and then fixed it again.

The right position is in the bin, along with his tinfoil hat and quartz
crystal pyramid knife sharpener

Sometimes TNP I see what makes so many cam.misc regulars find you
abrasive. This is one such occasion.

And Jim, you've suckered me into a cross-post to uk.d-i-y you old sod.

Haaaaaaaaaaaaaaa said you would