VHF/UHF for the better cables, the cheap stuff even from the big companies
was failing down in HF, we only tested down to 5 MHz and up to 450 MHz.
The good stuff passed at better than 80dB shield effectiveness over the full
range; the CIA and DoD were real fussy about those specs and was also when I
got a good education in ferrites for EMI suppression. We had a screen room
to play in.
Carl
KM1H
At CATV frequencies or 160m? Or both?
I've heard it said that quad shield only helps at VHF+. I don't know.
73, Mike
www.w0btu.com
On Tue, Apr 29, 2014 at 6:15 PM, Carl <km1h@jeremy.mv.com> wrote:
... quad shielded RG-6 and RG-11 made a substantial improvement over same
company dual shield when it came to signal ingress in harsh enviroments.
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|