Coaxial and Data Cables
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Unique cable design: The braid configuration and the expanded PTFE dielectrics of the LL cable constructions contribute to lower attenuation levels at higher frequencies, while providing shielding effectiveness levels that exceed those of flexible MIL-C-17 cables. Flat strips of silver plated copper are braided over the dielectric core with an intermediate metallized polyester or polyimide layer, and an outer round wire braid.
Improved electrical characteristics: LL cables with expanded PTFE dielectrics exhibit low coefficients of expansion over the entire operating temperature range from -100° C to +250° C. Impedance discontinuities are minimized at the cable- to-connector interface. Higher levels of power can be transmitted because higher temperatures do not affect the cable due to the temperature stability of the tape. Where phase versus temperature requirements are critical, LL cables allow for an approximately 75% lower phase shift and change in propagation time delay due to temperature. Temperature cycling tests have been performed on a number of cables with positive results.
Lowest attenuation for any given size: LL coaxial cables, with expanded PTFE dielectrics and strip braid composite configurations, offer attenuation from 20 to 35% below other mil spec cables of comparable size. When size and weight are considerations, LL cables should be considered. The graph below defines maximum attenuation levels for all LL cables referenced on the next page.
Technical support available: We continually work with cable assembly houses and connector manufacturers to ensure maximum system reliability. Cable designs take into consideration size and weight constraints, existing connector availability and termination techniques. Sources of supply for connectors operative to 18 GHz may be recommended.
Many special constructions available: The chart on the following page outlines just a few designs we have manufactured. Some of the more popular constructions are standard stock items, and many additional cables are available for prototype assemblies. Additional cables not referenced here are available to meet specific customer requirements.
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Solid PTFE dielectrics are manufactured with tight tolerances to ensure impedance uniformity and to effect VSWR levels that meet or exceed MIL-C-17 specifications for cables of comparable size. The strip braid configuration is by far the most effective means of lowering attenuation levels of coaxial cable at high frequencies while providing shielding effectiveness levels that exceed those of flexible MIL-C-17 cables. Flat strips of silver plated copper are braided over the dielectric core, frequently with an intermediate metallized mylar or kapton layer, and an outer round wire braid. This shielding technique provides superior shielding effectiveness and lower transfer impedance than any standard double braided mil-spec construction.
FEP jackets are typically used, but alternate designs are available such as flame retardant PVC and abrasion resistant overall braids. Marker tapes or surface printing are used for positive identification. strip.jpg
An overall FEP jacket is resistant to oil and chemicals. The cable is either unmarked or surface printed eliminating a marker tape that may cause problems in termination. Without the marker tape, an improved level of adhesion exists between the braided core and the jacket that allows ease of termination with short length assemblies. spiral.jpg
MIL-C-17 Coaxial and Twinaxial Cables
(67) Mil-C-17 cables are constructed with either solid or stranded silver plated conductors insulated with an extruded PTFE (polytetrafluoroethylene) dielectric. The outstanding electrical and mechanical properties of PTFE over a broad range of temperatures and frequencies make these coaxial cables the standard for a wide range of military and commercial applications. 0000083300_008.jpgLL (Low Loss) Coaxial Cables
(10)SB (Strip Band) Coaxial Cables
(5) SB coaxial cables have been designed for low attenuation at high frequencies, while using similar dimensions to MIL-C-17 constructions. Standard connectors may frequently be used, thereby avoiding tooling charges.Solid PTFE dielectrics are manufactured with tight tolerances to ensure impedance uniformity and to effect VSWR levels that meet or exceed MIL-C-17 specifications for cables of comparable size. The strip braid configuration is by far the most effective means of lowering attenuation levels of coaxial cable at high frequencies while providing shielding effectiveness levels that exceed those of flexible MIL-C-17 cables. Flat strips of silver plated copper are braided over the dielectric core, frequently with an intermediate metallized mylar or kapton layer, and an outer round wire braid. This shielding technique provides superior shielding effectiveness and lower transfer impedance than any standard double braided mil-spec construction.
FEP jackets are typically used, but alternate designs are available such as flame retardant PVC and abrasion resistant overall braids. Marker tapes or surface printing are used for positive identification. strip.jpg
SS (Spiral Strip) Coaxial Cables
(3) SS coaxial cables are flexible alternatives to semi-rigid coax, and the unique shielding configuration offers a cost effective, low attenuation option. The use of strip/round braid composite shields results in low transfer impedance levels. The 50 ohm constructions exhibit the same attenuation characteristics as the M17/130-RG402 and M17/133-RG405 cables. All SS cables have VSWR characteristics that meet or exceed similar size flexible constructions. SS402 and SS405 have been designed with diameters over the outer braids of .141" and 086" respectively, so standard SMA connectors may be used.An overall FEP jacket is resistant to oil and chemicals. The cable is either unmarked or surface printed eliminating a marker tape that may cause problems in termination. Without the marker tape, an improved level of adhesion exists between the braided core and the jacket that allows ease of termination with short length assemblies. spiral.jpg