CommScope Trunk & Distribution Cable - Manual (Page 8)

QR ® - Superior Design and Construction
QR’s patented design combines several elements to achieve its unparalleled combination of superior
performance in a smaller, less expensive cable.
The QR center conductor is copper-clad aluminum for superior RF transmission and is
generally larger than the conductors found in competitive cable of similar outer diameter.
The QR dielectric is a closed-cell polyethylene that is compressed during the swaging pro-
cess. Compression allows the dielectric to actively press against the shield and help heal small
dents. The closed-cell nature of the dielectric permits an impressively high velocity of propaga-
tion of 88%.
The QR shield is formed through a unique, high efficiency
process where a precision tape is continuously roll-formed
around the core and is then welded by RF induction. This results
in a contaminant-free seam which is stronger than the
surrounding material. We verify seam integrity with a core and
cone test, where a cored sample is flared to a diameter well
beyond even the most extreme installed usage.
Migra-Heal ® , CommScope’s special underjacket compound,
helps fill in jacket damage before moisture can seep in and cause corrosion.
The QR jacket is a tough medium-density polyethylene compound designed to resist the
effects of sun, moisture and temperature extremes.
Double jacketing, in which two independent jackets are separated by polypropylene tape, is
also available.
Steel armor is available for added protection.
Thin shield,
compressed
dielectric and
a larger center
conductor combine
to make QR the
best performing
coax available
anywhere
1.4 Introduction
QR Design Details and Advantages