> Tom, I don't doubt that you performed the cable TI measurement correctly
> but I have seen folks take data that is actually the TI of the test
> fixture
> and not the cables under test.
>
> What TI impedance did you measure?
I can't actually measure it Dave. I have a spare port on my test fixtu
>I suspect the corroded foil would have little measurable effect on the
> coax's shielding effectiveness for lower frequencies. The foil is
> primarily there for the higher frequencies, the braid for the lower
> frequencies (that's a generalization, but close).
I can put a number on that using two
I can easily and quickly test any 8 foot length Mike.
I just added a scrap from my old Dish network system that blew off the roof
last week.
:-)
- Original Message -
From: "Mike Waters"
To: "topband"
Sent: Wednesday, July 11, 2012 5:07 PM
Subject: Re: Topband: Cable shields
> Very g
Tom, I don't doubt that you performed the cable TI measurement correctly
but I have seen folks take data that is actually the TI of the test fixture
and not the cables under test.
What TI impedance did you measure?
Dave WX7G
On Jul 11, 2012 2:37 PM, "Tom W8JI" wrote:
> The statement CATV coaxia
I suspect the corroded foil would have little measurable effect on the
coax's shielding effectiveness for lower frequencies. The foil is
primarily there for the higher frequencies, the braid for the lower
frequencies (that's a generalization, but close).
I would be more concerned over how the foi
Very good, Tom.
I still wonder what the answer is to my earlier question (in late June)
about a flooded quad-shield coax with a corroded inner shield.
I suspect with a bonded foil inner shield, not much would change.
73, Mike
www.w0btu.com
___
UR RST I
The statement CATV coaxial cables or cables with foil/drain shields do not
have good shielding, because of transfer impedance and high resistance, was
made a while ago here on this reflector. I think the statement was those
shields are not good at MF or HF.
This past weekend, I modified a test
