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ECA 199-A Document Information:
Title
Solid and Semi-Solid Dielectric Transmission Lines
Electronic Components Association
Publication Date:
Jan 1, 1972
Scope:
General
This standard refers to solid- and semi-solid-dielectric
coaxial-cable transmission lines conasi sting of one or two inner
conductors.
Coaxial Cables
Basically, a coaxial cable is constructed of a single inner
conductor covered by a flexible low-loss r-f-dielectric core
material, which is then surrounded by a braided outer conductor,
with the whole covered by a protective covering. In some cases this
is covered by an extra outer braided armor for use in extremely
abusive applications. Each element of the construction is designed
to contribute to the requirements of the finished product.
Two-Conductor Coaxial Cables Individual dielectric cores of
two-conductor coaxial cables shall meet the requirements of solid
or semi-solid dielectric cores. One strand of one of the inner
conductors shall be coded for identification and shall be visible
without disturbing the stranding. That is, if all of the strands of
the inner conductors are coated, then one strand shall be bare; or
if all of the strands are bare, then one strand shall be
coated.
Twin-Coaxial Cables
Twin-coaxial cables shall be constructed of individual inner
conductors within individual dielectric cores, within a common
outer-conductor braid. As an alternate construction, a twin-coaxial
cable may be constructed of individual inner conductors within
individual inner dielectric cores, within a common outer core that
may be filled-to-round.
Dual-Coaxial Cables
Dual-coaxial cables shall be constructed of individual inner
conductors within individual dielectric cores, within individual
outer conductor inner braids, within a common outer conductor outer
braid.
Application
Coaxial cables covered by this standard are primarily intended
for use as transmission lines to conduct energy in a simple power
transfer, continuously or intermittently. In general, these coaxial
cables are designed for low-loss stable operation from the
relatively low radio frequencies thru the higher frequencies
encountered in the microwave and radar regions of the frequency
spectrum. Typical uses include runs of cable carrying critically
exact signals between or within units of electronic, radio,
television or other communication equipment. Coaxial cables may
also be used as circuit elements, delay lines or impedance matching
devices.
PURPOSE
The primary object of this standard is to insure the uniformity
of similar-type coaxial cables obtained from different sources of
supply. It is also intended that this standard shall serve as a
guide in the manufacture and application of these cables.
In view of the extensive use of solid- and semi-solid-dielectric
coaxial cables requiring a wide range of impedances, sizes and
other characteristics, care has been taken in this standard to
avoid unnecessarily restrictive standardization but at the same
time, wherever feasible, to limit the number of designated standard
types.
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