LL (Low Loss) Coaxial Cable
-stranded center conductors

Construction:
Center Conductor: Stranded silver plated copper
Dielectric: Expanded PTFE tape
Inner Braid: Flat silver plated copper strip
Inter layer: Aluminum polyester or polyimide tape
Outer Braid: Round silver plated copper
Jacket: FEP, translucent colors, solid colors or clear
LL142STR
LL270STR
LL450STR
LL480STR

LL (Low Loss) Coaxial Cable
-stranded center conductors
Operating temperature -55 +200° C
Velocity of Propagation 80%-83%
Impedence 50 Ohms
Capacitance 25.0 pF/ft
Shielding Effectiveness <-95 dB

Flexibility with stranded center conductors Harbour’s Low Loss coax designs with stranded center conductors are more flexible than similar designs with solid center conductors. Low loss cables with stranded center conductors exhibit attenuation slightly higher than comparable solid center conductor designs; however, unique composite braid configurations and expanded PTFE dielectrics result in attenuation lower than MIL-DTL-17 cables of comparable size. Shielding effectiveness levels also exceed those of flexible MIL-DTL-17 constructions.

Excellent electrical characteristics All of Harbour’s LL cables with expanded PTFE dielectrics exhibit low coefficients of expansion over the entire operating temperature range from -55° C to +200° 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 thermal stability of the tape. Where phase versus temperature requirements are critical, Harbour’s 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 Harbour’s cables with positive results.

Attenuation Calculation and K Factors Although typical and maximum attenuation values are given for discrete frequencies, typical attenuation values may be calculated by using K1 and K2 factors for each construction. The K1 factor is calculated by taking into consideration the type, strand factor, and diameter of the center conductor, and the impedance of the cable. The K2 factor is calculated by taking into consideration the velocity of propagation and the dissipation factor of the dielectric.

LL（低損耗）同軸電纜
-stranded中心導體
結構：
中心導體：多股鍍銀銅
介質：膨體聚四氟乙烯帶
內蒙古編織：平鍍銀銅條
國米層：鋁聚酯或聚酰亞胺膠帶
外部編織物：圓形鍍銀銅
外套：FEP，半透明色，純色或透明
LL142STR
LL270STR
LL450STR
LL480STR

LL（低損耗）同軸電纜
-stranded中心導體
工作溫度-55 + 200℃
傳播80％-83％的速度
阻抗50歐姆
電容25.0 pF的/英尺
屏蔽效能<-95分貝
靈活性與絞合中心導體港的低損耗同軸設計與絞合中心導體比同類的設計與實心導線更靈活。低損耗電纜絞線中心導體表現出的衰減比同類固態中心導體設計稍高;然而，獨特的複合編織物構造和膨脹的PTFE介質導致衰減比MIL-DTL-17電纜可比大小的低。屏蔽效果的水平也超過這些柔性MIL-DTL-17的結構。
優良的電氣特性全港的LL電纜與膨體PTFE介電材料具有膨脹係數低，在整個工作溫度範圍為-55°C至+ 200°C。阻抗不連續降到最低的電纜到連接器接口。可以傳送更高水平的功率，因為更高的溫度不會影響電纜由於帶的熱穩定性。凡階段對溫度的要求是至關重要的，港灣的LL電纜允許一個低約75％的相移及變化傳播時間延遲，由於溫度。溫度循環試驗已經在許多海港的電纜取得積極成果已經完成。
衰減計算與雖然典型和最大衰減值K係數是給出了離散頻率，典型的衰減值可通過使用K1和K2因子為每個施工來計算。該K1因子由考慮到的類型，鏈因子，以及中心導體的直徑，電纜的阻抗計算出的。 K2的係數是通過考慮到傳播速度和電介質的損耗因數計算出的。