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誰知道625電纜 ZZY電纜 這兩種是什么電纜 知道的望告知 謝謝
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P3 625 JCAM109 / P3 625JCAM109
75 Ohm Coaxial Cable
Trunk & Distribution
PRODUCT DESCRIPTION: (AERIAL CONSTRUCTION)
SOLID ALUMINUM TUBE SWAGED ONTO DIELECTRIC
CORE, FULLY BONDED COPPER CLAD CENTER CONDUCTOR
MEDIUM DENSITY PE JACKET, “FIGURE 8” INTEGRATED
MESSENGER
CENTER CONDUCTOR:
COPPER CLAD ALUMINUM
NOMINAL DIAMETER: 0.137” (3.48 mm)
DIELECTRIC:
MICRO-CELLULAR FOAM PE
NOMINAL DIAMETER 0.565” (14.35 mm)
SHIELD:
SOLID ALUMINUM TUBE
NOMINAL OUTER CONDUCTOR THICKNESS: 0.030” (0.76 mm)
JACKET:
MEDIUM DENSITY PE
NOMINAL JACKET DIAMETER: 0.685” (17.40 mm)
NOMINAL JACKET THICKNESS: 0.030” (0.76 mm)
MESSENGER:
NOMINAL DIAMETER OF STEEL MESSENGER: 0.109” (2.77 mm)
MINIMUM BREAKING STRENGTH OF MESSENGER: 1,800 lbs. (816 kgf)
MECHANICAL CHARACTERISTICS:
MINIMUM BEND RADIUS STANDARD: 7.0” (17.8 cm)
MINIMUM BEND RADIUS: BONDED = 4.5” (11.4 cm)
MAXIMUM PULLING TENSION = 475 lbs. (216 kgf)
ELECTRICAL CHARACTERISTICS:
CAPACITANCE: 15.3 ± 1.0 pf/ft. (50 ±3.0 nf/km)
IMPEDANCE: 75 ± 2 Ohms
VELOCITY OF PROPAGATION: 87% NOMINAL
NOMINAL DC LOOP RESISTANCE @ 68oF: 1.10 Ohms/1000 ft. (3.51 Ohms/km)
ATTENUATION @ 68oF (20oC):
@ Frequency MHz dB/100 ft. (MAX.) dB/100 meters (MAX.)
5 MHz 0.13 0.43
55 MHz 0.46 1.51
83 MHz 0.57 1.87
211 MHz 0.92 3.02
250 MHz 1.00 3.28
300 MHz 1.08 3.54
350 MHz 1.18 3.87
400 MHz 1.27 4.17
450 MHz 1.35 4.43
500 MHz 1.43 4.69
550 MHz 1.50 4.92
600 MHz 1.58 5.18
750 MHz 1.78 5.84
865 MHz 1.93 6.33
1000 MHz 2.07 6.79
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