Topband: 1000 feet 5/8" hardline or 600ohm True Ladder line.

[Carl]

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 at 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.