March 17th 14, 03:45 PM
posted to uk.radio.amateur,rec.radio.amateur.equipment,rec.radio.amateur.misc
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First recorded activity by RadioBanter: Nov 2007
Posts: 568
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Quad shield coax & dielectric?
In message , Brian
Morrison writes
On Fri, 14 Mar 2014 15:51:51 -0700
Bob E. wrote:
75-ohm RG-6 coax: quad shield differs from "standard" RG-6 in that
the dielectric is reduced in diameter to accomodate the extra
shielding.
How does this affect the performance? I'm looking at 1 GHz (HDTV
use).
Thanks.
If the dielectric is reduced in diameter then to maintain the same Zo
for the same Er the inner conductor will have to be reduced in diameter
too. This will tend to increase the loss in the cable because of the
increased resistive losses and the dielectric loss will be higher
because the field is more concentrated in the dielectric.
What is your prime requirement? Do you need the low loss or the good
screening more?
See existing thread.
--
Ian
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