1、L- -* EIA 177-A 72 m 3234600 0028746 2 m - / QARD 4 01 oi VI a a 8 c 8 Solid and Semi-Solid Dielectric Transmission Lines a Y a I Engineering Department RS=l99=A (Revision of RS-199) April 1972 ELECTRONIC INDUSTRIES ASOCIATIO NOTICE EIA engineering standards are designed to serve the public interest
2、 through eliminating mis- understandings between manufacturers and purchasers, facilitating interchangeability and improve- ment of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such standards shall not in
3、 any respect pre- clude any member or non-member of EIA from manufacturing or selling products not conforming to such standards, nor shall the existence of such standards preclude their voluntary use by those other than EIA members whether the standard is to be used either domestically or internatio
4、nally. Recommended standards are adopted by EIA without regard to whether or not their adoption may involve patents on articles, materials, or processes. By such action, EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the recommen
5、ded*standards. Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001 Eye Street, N. W., Washington, D. C. 20006 GElectronic Industries Association 1972 Ail rights reserved PRICE: $4.00 Printed in U.S.A. i P IA 199-A 72 3234600 0028948 b m RS-199-A Page 1 SOLID AND SEMI-SOLID DIE
6、LECTRIC TRANSMISSION LINES (From RS-199 and Standards Proposal No. 11 05, formulated under the cognizance of ANSI Subcommittee C83.3 on RF Cable.) 1. SCOPE 1.1 General a This standard refers to solid- and semi-solid-dielectric coaxial-cable transmission lines consisting of one or two inner conductor
7、s. 1.1.1 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
8、 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. 1.1.2 Two-Conductor Coaxial Cables a Individual dielectric cores of two-conductor coaxial cables shall meet the requirements of soli
9、d 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, th
10、en one strand shall be coated. 1.1.2.1 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 cond
11、uctors within individual inner dielectric cores, within a common outer core that may be filled-to-round. 1.1.2.2 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 co
12、mmon outer conductor outer braid. 1.2 Application Coaxial cables covered by this standard are primarily intended for use as transmission lines to conduct EIA 199-A 72 m 3234b00 0028949 8 m RS-199-A Page 2 energy in a simple power transfer, continuously or intermittently. In general, these coaxial ca
13、bles 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,
14、radio, television or other communication equipment. Coaxial cables may also be used as circuit elements, delay lines or impedance matching devices. 2. PURPOSE The primary object of this standard is to insure the uniformity of similar-type coaxial cables obtained from different sources of supply. It
15、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 t
16、o avoid unnecessarily restrictive standardization but at the same time, wherever feasible, to limit the number of designated standard types. 3. STANDARD TYPES 3.1 Type Designation System The Type Designation Number shall be determined as follows: 3.1.1 The letters “SDC” shall signify solid and semi-
17、solid dielectric coaxial cables covered by this standard. A dash shall follow, , 3.1.2 Two or more digits shall follow, signifying the nominal characteristic impedance in ohms. 3.1.3 When applicable, for two-conductor coaxial cables a letter shall follow, “T” for twin-coaxial cables or “D” for dual-
18、coaxial cables. A dash shall follow. 3.1.4 One or more digits assigned serially shall follow, signifying different sizes and types of coaxial cables which have the same nominal characteristic impedance as a group. 3.1.5 A letter shall follow, signifying the different types B jacket insulation materi
19、al, “S” for polyvinyl-chloride (PVC) or “P” for fluorinated ethylene propylene (FEP). 3.1.6 When applicable, the letter “A” shall follow, signifying a cable with a protective armor braid. 3.2 List of Standard Coaxial Cables 7 Y Coaxial cables covered by this standard are listed in Tables I and II. P
20、erformance parameters of these cables are listed in Table III. Materials used in the construction of these cables are covered in Section 0 EIA 199-A 72 3234600 O028950 4 W RS-199-A Page 3 4. The tests performed to determine the quality and conformance of these cables to this standard are covered in
21、Section 5. 4. MATERIALS 4.1 Inner Conductors Tolerances on the inner conductor dimensions shall be rounded out to the next highest .O01 inch, unless otherwise specified. 4.1.1 Solid inner Conductors 4.1.1.1 Bare Copper Wire (B-C) Bare copper wire shall conform to soft or annealed copper wire, in acc
22、ordance with ASTM B-3. 4.1.1.2 Tin-Coated Copper Wire (T-C) Tin-coated copper wire shall conform to tin-coated, soft or annealed copper wire, in accordance with ASTM B-33. 4.1.1.3 Copper-Covered Steel Wire (CWD) Copper-covered steel wire shall conform to high-strength, 40% conductivity, hard-drawn,
23、copper-covered steel wire, in accordance with ASTM B-227, Grade 40HS. For wires smaller than .O201 inch, the tensile strength shall be 110,000 pounds per square. inch (PSI) minimum, the elongation shall be 1% minimum in 10 inches and the thickness of the copper covering shall not be less than 10% of
24、 the wire diameter. 4.1.1.4 Annealed Copper-Covered Steel Wire (A-CWD) Annealed copper-covered steel wire shall conform to the same requirements as copper- covered steel wire as in Section 4.1.1.3, except that it shall be annealed. The tensile strength shall be 55,000 PSI minimum and the elongation
25、shall be 8% minimum in 10 inches. 4.1.1.5 Silver-Coated Wire (S-C, S-CWD, S-A-CWD) Silver-coated wire shall be coated with 40 microinches minimum thickness of silver, in accordance with ASTM B-298. 4.1.2 Stranded Inner Conductors Stranded inner conductors shall be concentrically stranded, in accorda
26、nce with ASTM B-8. Stranded inner conductors shall not be coated after stranding (no over-coating). Individual wires shall meet the requirements of the basic wires. _ EIA 199-A 72 m 3234b00 0028951 b m I RS-199-A Page 4 4.2 Dielectric Cores Dielectric core material shall be of uniform thickness cons
27、istent with the electrical, environmental and dimensional requirements specified. Dielectric core types shall be as specified in Tables I and II. 4.2.1 Solid-Dielectric Cores Solid dielectric cores shall not contain any air bubbles or voids. There shall be good adhesion between the core and the inne
28、r conductor. The inner conductor eccentricity shall not exceed 10% of the core radius. 4.2.2 Semi-Solid (Air-Spaced)-Dielectric Cores In semi-solid dielectric cores there shall be good adhesion between elements of the core. Air-spaced semi-solid dielectric cores shall be made in such a manner that a
29、ir spaces are a basic element of the construction. 4.2.3 Dielectric Core Types Dielectric core materials shall be one of the following types. The dielectric constant and the dissipation factor shall be consistent with the applicable electrical requirements. B) 4.2.3.1 Types “A” Polyethylene of the l
30、ow-density dielectric type. 4.2.3.1.1 Type “A-1” Solid polyethylene. 4.2.3.1.2 Type “A-2” Solid polyethylene coated with the best commercial grade of talc, to prevent sticking between individual core materials of two-conductor coaxial cables. 4.2.3.1.3 Type “A-3” Semi-solid air-spaced polyethylene.
31、One filament thread or a braid of more than one filament thread, within a tube of solid polyethylene, or spiraled fins between tubes of solid polyethylene. 4.2.3.2 Types “F-1” Solid, Extruded Polytetrafluoroethylene. 4.3 Outer Conductors EIA 199-A 72 W 3234600 0028952 8 W RS-199-A Page 5 Outer condu
32、ctors shall be braided. Braids shall be applied with the maximum tension possible so as to e prevent loosening or creeping, but not to cause broken ends. Braids shall have no irregularities, no breaks or other discontinuities, and no loose un-interwoven strands. There shall be no splices in the comp
33、leted braid. The individual strands shall meet the applicable requirements of the inner conductor wires, The number of braids shall be as specified in Tables I and II. The percent coverage of the braids shall be determined in accordance with the following formulae: 2 T (D + 2d) P C tan a = NPd F = -
34、 sin a PERCENT COVERAGE = (2F - F2) X 100 Where: D = Maximum outside diameter of the dielectric core under the outer conductor braid. In the case of double braid construction, the diameter (D) for deter- mining the coverage of the outer braid shall be the outside diameter of the inner braid. d = Dia
35、meter of an individual strand of the braid. N = Number of ENDS (wire strands) per Carrier. C = Number of CARRIERS (separated groups of Ends) around the diameter of the cable. P = Minimum number of PICKS PER INCH (separation points between Carriers) along the length of the cable. a = Smaller angle be
36、tween the longitudinal axis of the cable and the lay of the outer conductor braid. For two-conductor cables that are not filled-to-round: 2 (Di + 2d)P + C C 4(D2 - Di) P tana = Where: Dl = Same as D above, except the minor diameter. D2 = Same as D above, except the major diameter. 4.4 Jackets Jacket
37、 materials shall be tough, non-hygroscopic, and cover the cable tightly and evenly in a manner consistent with the mechanical, environmental and dimensional requirements. The jacket material shall be as specified in Tables I and II. Jacket material shall be one of the following types: 4.4.1 Type ?S?
38、 - Type ?S? jackets shall be a non-contaminating type of low-temperature plasticized or RS-199-A Page 6 EIA 199-A 72 3234600 O028953 T W compounded polyvinyl-chloride or vinyl-chloride-vinyl-acetate copolymer (PVC), colored, black. 4.4.2 Type “P” Type “P” jackets shall be extruded fluorinated ethyle
39、ne propylene (FEP), colored, brown. 4.5 Armor Metal armoring shall be a braid construction that is rugged, tough and flexible, Individual braid wires shall be “Alclad 5026” aluminum alloy with a diameter of .O126 ? .O005 inch, a tensile strength of 50,000 PSI minimum, and an elongation of 2% minimum
40、 in 10 inches, The percent coverage of the braid shall be 88% minimum, determined as specified in Section 4.3. 4.5.1 Armor Paint Armor shall be covered with an aluminum paint in paste form, colored, light green. 5. ELECTRICAL AND ENVIRONMENTAL CHARACTERISTICS 5.1 Heat-Aging Stability The heat-aging
41、stability test is applicable to Jacket Type “S” only. For armored cables, the armor shall be removed before being subjected to the test. Two specimens shall be subjected to the test. The length of each specimen shall be 150 times the maximum diameter of the cable. The test specimens shall be suspend
42、ed in a test oven without touching one another or the walls of the oven. The specimens shall be held at +98”C f 2C for a period of 7 days. Heated air at atmospheric pressure shall be circulated so as to maintain a uniform test temperature. After the test period, the specimens shall be removed from t
43、he test oven and conditioned at room ambient temperature for a period of 4 hours minimum. Examine the specimens for cracks, flaws or other damage. After the heat aging stability test, the specimens shall be subjected to the cold bend test of Section 5.3. 5.2 Stress-Crack Resistance The stress-crack-
44、resistance test is applicable to Jacket Type “P” only. For armored cables, the armor shall be removed before being subjected to the test, a Two specimens shall be subjected to the test. The length of each specimen shall be three feet approximately. EIA 199-A 72 m 3234b00 0028954 1 m RS-199-A Page 7
45、The specimens shall be wrapped tightly for 10 turns around a mandrel whose outer diameter shall be 3 times the maximum diameter of the cable. The ends of the cable shall be clamped to the mandrel. The test specimens on their mandrels shall be placed in a test oven without touching one another or the
46、 walls of the oven. The specimens shall be conditioned at +2OO0C I SOC for a period of 96 hours. Heated air at atmospheric pressure shall be circulated so as to maintain a uniform test temperature. 0 After the test period, the specimens shall be removed from the test oven and held at room ambient te
47、mperature for a period of 4 hours minimum. Unwind the specimens from the mandrels and examine them for cracks, flaws or other damage. After the stress-crack-resistance test, the specimens shall be subjected to the cold bend test of Section 5.3. 5.3 ColdBend The cold bend test shall be given to the t
48、wo test specimens that have been subjected to the heat aging stability test or the stress-crack-resistance tests. From one of the two test specimens, the jacket and outer conductor braid shall be removed, leaving the dielectric core as the outer surface. One end of each specimen shall be clamped on
49、a mandrel whose outer diameter shall be 10 times the maximum diameter of the cable. Wrap the specimens around the mandrel for one full turn beyond the clamping point. The test specimens on their mandrels shall be placed in a cold chamber with the un-wrapped portion of the specimens kept reasonably straight. The specimens shall be held for 20 hours at a test temperature of -40C f 2OC for Jacket Type “S”, or at -55OC 1: 2C for Jacket Type “P”. . o After the test period and while the specimens are still at the test temperature, the specimens shall be wrapped around the mandrels fo
